Northwest River Forecast Center
Water Supply Seasonal Forecasts
Ensemble Date: 2026-09-06 Issued Date: 2026-09-06
Water Year 2026
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
SILVIES - NEAR BURNS APR-AUG 13.1 19 13.1 19 13.1 19 71 158 13.20
APR-JUL 12.6 18 12.6 18 12.6 18 70 156 12.69
APR-SEP 14.2 20 14.3 20 14.2 20 71 160 13.31 19
JAN-JUL 34.8 32 34.8 32 34.8 32 108 281 34.80
JAN-SEP 36.3 33 36.5 33 36.3 33 110 284 35.42 32
OCT-SEP 44.0 38 44.1 38 43.9 38 116
DONNER UND BLITZEN - NR FRENCHGLEN APR-AUG 24.2 40 24.2 40 24.2 40 60 77 24.23
APR-JUL 22.4 39 22.4 39 22.4 39 57 73 22.50
APR-SEP 26.0 42 26.5 42 26.0 42 63 80 24.57 41
JAN-JUL 35.9 48 35.9 48 35.9 48 74 114 35.95
JAN-SEP 39.5 50 40.0 50 39.4 50 79 121 38.02 49
OCT-SEP 49.8 57 50.3 57 49.8 57 88
DUNGENESS - NEAR SEQUIM APR-AUG 62.6 46 62.6 46 62.6 46 136 108 62.73
APR-JUL 57.0 47 57.0 47 57.0 47 121 100 57.16
APR-SEP 67.1 46 68.8 48 67.0 46 145 113 63.59 46
JAN-JUL 134.7 69 134.7 69 134.7 69 195 147 134.87
JAN-SEP 144.7 66 146.5 67 144.7 66 219 160 141.30 67
OCT-SEP 238.3 83 240.0 84 238.2 83 287
SKAGIT - NEAR CONCRETE APR-AUG 3710.6 67 3710.6 67 3710.6 67 5549 3966 3716.58
APR-JUL 3390.0 68 3390.0 68 3390.0 68 4959 3545 3395.99
APR-SEP 3966.2 67 4086.0 69 3950.2 66 5955 4236 3761.05 67
JAN-JUL 6810.1 93 6810.1 93 6810.1 93 7334 5445 6818.22
JAN-SEP 7386.3 89 7506.1 90 7370.3 88 8330 6136 7183.28 90
OCT-SEP 11523.1 105 11642.9 106 11507.1 105 10972
KOOTENAI - LIBBY DAM APR-AUG 6525.0 107 6525.0 107 6525.0 107 6080 4257 6530.26
APR-JUL 6113.1 110 6113.1 110 6113.1 110 5570 3840 6118.44
APR-SEP 6824.1 106 6870.1 107 6808.6 106 6429 4497 6582.65 107
JAN-JUL 7222.1 116 7222.1 116 7222.1 116 6227 4314 7224.00
JAN-SEP 7933.0 112 7979.0 113 7917.5 112 7086 4971 7688.21 113
OCT-SEP 8881.0 111 8927.0 112 8865.6 111 7981
KOOTENAI - AT LEONIA APR-AUG 7409.2 100 7409.2 100 7409.2 100 7409 5183 7417.04
APR-JUL 6958.3 101 6958.3 101 6958.3 101 6858 4741 6966.14
APR-SEP 7743.7 99 7788.5 100 7726.5 99 7803 5446 7475.52 100
JAN-JUL 8702.4 110 8702.4 110 8702.4 110 7877 5488 8705.95
JAN-SEP 9487.8 108 9532.5 108 9470.6 107 8822 6194 9215.33 108
OCT-SEP 11055.7 111 11100.4 112 11038.5 111 9923
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
MOYIE - AT EASTPORT APR-AUG 305.6 78 305.6 78 305.6 78 390 253 306.21
APR-JUL 301.2 79 301.2 79 301.2 79 382 246 301.79
APR-SEP 310.1 79 310.3 79 309.9 79 395 257 306.83 79
JAN-JUL 417.3 97 417.3 97 417.3 97 431 274 417.69
JAN-SEP 426.2 96 426.4 96 426.1 96 443 286 422.73 96
OCT-SEP 499.1 104 499.3 104 499.0 104 479
KOOTENAI - AT BONNERS FERRY APR-AUG 8014.2 99 8014.2 99 8014.2 99 8061 5650 8023.40
APR-JUL 7552.5 101 7552.5 101 7552.5 101 7495 5174 7561.72
APR-SEP 8361.3 99 8406.0 99 8343.9 99 8463 5941 8086.23 99
JAN-JUL 9471.7 110 9471.7 110 9471.7 110 8596 5962 9475.82
JAN-SEP 10280.5 107 10325.2 108 10263.1 107 9565 6729 10000.33 108
OCT-SEP 12018.5 112 12063.2 112 12001.1 112 10724
BLACKFOOT - NEAR BONNER APR-AUG 860.2 101 860.2 101 860.2 101 855 415 862.12
APR-JUL 816.5 101 816.5 101 816.5 101 811 390 818.43
APR-SEP 897.9 101 901.0 101 897.7 101 891 435 868.46 101
JAN-JUL 1058.3 113 1058.3 113 1058.3 113 937 474 1058.99
JAN-SEP 1139.7 112 1142.8 112 1139.5 112 1017 519 1109.02 112
OCT-SEP 1270.3 113 1273.4 113 1270.1 113 1126
CLARK FORK - ABOVE BLACKFOOT APR-AUG 490.1 77 490.1 77 490.1 77 637 380 491.06
APR-JUL 456.7 77 456.7 77 456.7 77 594 358 457.60
APR-SEP 537.8 79 541.5 80 536.4 79 680 399 497.13 77
JAN-JUL 653.0 86 653.0 86 653.0 86 756 483 653.52
JAN-SEP 734.1 87 737.8 88 732.7 87 842 523 693.05 86
OCT-SEP 877.9 88 881.6 89 876.5 88 996
CLARK FORK - ABOVE MISSOULA APR-AUG 1350.3 90 1350.3 90 1350.3 90 1492 795 1353.17
APR-JUL 1273.2 91 1273.2 91 1273.2 91 1405 748 1276.02
APR-SEP 1436.3 91 1442.2 92 1434.1 91 1571 834 1365.58 91
JAN-JUL 1711.3 101 1711.3 101 1711.3 101 1693 956 1712.49
JAN-SEP 1874.5 101 1880.3 101 1872.2 101 1859 1042 1802.05 100
OCT-SEP 2148.9 101 2154.7 102 2146.7 101 2122
BITTERROOT - NEAR DARBY APR-AUG 454.6 92 454.6 92 454.6 92 497 323 455.30
APR-JUL 426.4 92 426.4 92 426.4 92 465 296 427.11
APR-SEP 478.9 92 479.8 92 478.4 92 519 339 460.36 92
JAN-JUL 534.1 102 534.1 102 534.1 102 521 342 534.29
JAN-SEP 586.6 102 587.5 102 586.0 102 575 384 567.54 102
OCT-SEP 649.7 104 650.6 104 649.2 104 624
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
BITTERROOT - NEAR MISSOULA APR-AUG 1145.1 92 1145.1 92 1145.1 92 1241 812 1147.19
APR-JUL 1102.8 93 1102.8 93 1102.8 93 1191 777 1104.93
APR-SEP 1198.4 93 1202.2 93 1197.8 93 1289 843 1155.07 92
JAN-JUL 1456.1 105 1456.1 105 1456.1 105 1385 942 1457.06
JAN-SEP 1551.7 105 1555.5 105 1551.1 105 1484 1008 1507.20 104
OCT-SEP 1834.1 110 1837.9 110 1833.5 110 1669
CLARK FORK - BELOW MISSOULA APR-AUG 2442.9 88 2442.9 88 2442.9 88 2767 1551 2447.59
APR-JUL 2325.0 88 2325.0 88 2325.0 88 2630 1465 2329.72
APR-SEP 2580.8 89 2589.4 90 2577.8 89 2893 1626 2467.32 88
JAN-JUL 3083.8 99 3083.8 99 3083.8 99 3121 1838 3085.67
JAN-SEP 3339.6 99 3348.1 99 3336.5 99 3384 1999 3223.27 98
OCT-SEP 3888.1 101 3896.6 102 3885.0 101 3838
CLARK FORK - AT ST REGIS APR-AUG 3199.5 89 3199.5 89 3199.5 89 3610 2086 3206.29
APR-JUL 3037.2 89 3037.2 89 3037.2 89 3429 1970 3043.95
APR-SEP 3373.2 89 3381.6 90 3370.1 89 3771 2185 3231.32 89
JAN-JUL 4161.2 101 4161.2 101 4161.2 101 4109 2467 4164.38
JAN-SEP 4497.2 101 4505.7 101 4494.2 101 4451 2682 4351.75 101
OCT-SEP 5297.6 105 5306.1 105 5294.6 105 5042
NF FLATHEAD - NEAR COLUMBIA FALLS APR-AUG 1629.4 96 1629.4 96 1629.4 96 1690 1231 1631.26
APR-JUL 1562.5 98 1562.5 98 1562.5 98 1600 1157 1564.38
APR-SEP 1678.2 96 1682.6 96 1677.6 96 1750 1272 1639.62 96
JAN-JUL 1962.0 111 1962.0 111 1962.0 111 1771 1291 1963.23
JAN-SEP 2077.8 108 2082.2 108 2077.2 108 1921 1406 2038.47 109
OCT-SEP 2457.0 115 2461.4 115 2456.4 115 2133
MF FLATHEAD - NEAR WEST GLACIER APR-AUG 1612.4 98 1612.4 98 1612.4 98 1651 1232 1614.51
APR-JUL 1551.2 98 1551.2 98 1551.2 98 1576 1181 1553.26
APR-SEP 1673.3 99 1684.3 99 1668.0 98 1697 1258 1622.25 98
JAN-JUL 1986.3 114 1986.3 114 1986.3 114 1744 1339 1987.56
JAN-SEP 2108.4 113 2119.4 114 2103.2 113 1865 1416 2056.55 113
OCT-SEP 2556.0 124 2567.0 124 2550.8 124 2065
SF FLATHEAD - HUNGRY HORSE DAM APR-AUG 1905.0 93 1905.0 93 1905.0 93 2043 1423 1907.91
APR-JUL 1853.2 94 1853.2 94 1853.2 94 1981 1388 1856.10
APR-SEP 1970.1 94 1982.9 95 1966.3 94 2088 1445 1913.22 93
JAN-JUL 2427.6 109 2427.6 109 2427.6 109 2236 1645 2428.97
JAN-SEP 2544.5 109 2557.3 109 2540.7 108 2343 1702 2486.09 108
OCT-SEP 3071.3 120 3084.1 120 3067.5 119 2567
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
FLATHEAD - AT COLUMBIA FALLS APR-AUG 5104.7 93 5104.7 93 5104.7 93 5473 3853 5111.80
APR-JUL 4932.4 94 4932.4 94 4932.4 94 5237 3691 4939.48
APR-SEP 5282.9 94 5312.1 94 5273.5 94 5634 3940 5131.56 93
JAN-JUL 6349.1 109 6349.1 109 6349.1 109 5847 4174 6353.18
JAN-SEP 6699.6 107 6728.8 108 6690.2 107 6244 4422 6545.26 107
OCT-SEP 8044.5 116 8073.7 117 8035.1 116 6906
FLATHEAD - SELI’Š KSANKA QLISPE’ DAMAPR-AUG 5939.8 93 5939.8 93 5939.8 93 6396 4521 5950.74
APR-JUL 5748.4 94 5748.4 94 5748.4 94 6137 4325 5759.34
APR-SEP 6160.4 94 6190.7 94 6148.5 93 6577 4616 5980.30 93
JAN-JUL 7494.4 107 7494.4 107 7494.4 107 7010 5036 7499.95
JAN-SEP 7906.5 106 7936.7 107 7894.6 106 7450 5327 7720.91 106
OCT-SEP 9448.2 114 9478.5 115 9436.3 114 8277
CLARK FORK - NEAR PLAINS APR-AUG 9521.6 93 9521.6 93 9521.6 93 10215 6872 9540.20
APR-JUL 9163.1 94 9163.1 94 9163.1 94 9749 6542 9181.64
APR-SEP 9946.3 94 9984.2 94 9929.3 94 10574 7082 9597.21 93
JAN-JUL 12131.9 107 12131.9 107 12131.9 107 11342 7814 12140.84
JAN-SEP 12915.1 106 12953.0 106 12898.2 106 12168 8354 12556.41 106
OCT-SEP 15319.6 112 15357.5 113 15302.6 112 13632
CLARK FORK - CABINET GORGE DAM APR-AUG 9834.5 87 9834.5 87 9834.5 87 11280 6998 9856.01
APR-JUL 9470.6 88 9470.6 88 9470.6 88 10767 6687 9492.15
APR-SEP 10317.2 89 10355.5 89 10299.8 88 11639 7179 9912.12 87
JAN-JUL 12759.4 101 12759.4 101 12759.4 101 12591 7935 12767.85
JAN-SEP 13606.0 101 13644.2 101 13588.5 101 13463 8428 13187.82 100
OCT-SEP 16253.7 108 16292.0 109 16236.2 108 14991
PRIEST - NEAR PRIEST RIVER APR-AUG 420.5 51 420.5 51 420.5 51 823 637 421.88
APR-JUL 412.0 52 412.0 52 412.0 52 800 621 413.33
APR-SEP 440.5 52 443.9 53 439.4 52 843 649 423.06 51
JAN-JUL 663.8 65 663.8 65 663.8 65 1026 804 663.73
JAN-SEP 692.4 65 695.7 65 691.2 65 1069 832 673.46 64
OCT-SEP 920.2 76 923.6 76 919.1 76 1217
PEND OREILLE - ALBENI FALLS DAM APR-AUG 10951.8 85 10951.8 85 10951.8 85 12919 8764 10975.41
APR-JUL 10527.2 85 10527.2 85 10527.2 85 12369 8391 10550.81
APR-SEP 11449.4 86 11499.7 86 11426.5 86 13347 9030 11039.29 85
JAN-JUL 14650.8 98 14650.8 98 14650.8 98 14922 10473 14660.74
JAN-SEP 15573.0 98 15623.4 98 15550.2 98 15900 11112 15149.22 97
OCT-SEP 19007.8 106 19058.2 106 18985.0 106 17911
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
COLUMBIA - AT INTL BOUNDARY APR-AUG 51372.8 96 51372.8 96 51372.8 96 53664 42218 51414.09
APR-JUL 47111.2 98 47111.2 98 47111.2 98 48307 37452 47152.50
APR-SEP 53953.8 95 54122.2 95 53848.3 95 56951 45091 51999.11 96
JAN-JUL 57979.5 105 57979.5 105 57979.5 105 55223 43551 57991.64
JAN-SEP 64822.1 101 64990.5 102 64716.5 101 63866 51189 62838.25 103
OCT-SEP 74353.9 104 74522.4 104 74248.4 104 71709
KETTLE - AT LAURIER APR-AUG 1017.9 53 1017.9 53 1017.9 53 1928 1670 1019.63
APR-JUL 1004.4 53 1004.4 53 1004.4 53 1886 1646 1006.14
APR-SEP 1029.4 53 1032.2 53 1028.4 53 1954 1682 1021.52 53
JAN-JUL 1286.0 62 1286.0 62 1286.0 62 2058 1798 1286.61
JAN-SEP 1310.9 62 1313.7 62 1310.0 62 2125 1833 1301.99 62
OCT-SEP 1426.6 63 1429.4 64 1425.7 63 2247
NF COEUR D ALENE - AT ENAVILLE APR-AUG 360.2 50 360.2 50 360.2 50 727 462 361.89
APR-JUL 347.8 49 347.8 49 347.8 49 708 450 349.47
APR-SEP 372.8 50 373.8 50 372.7 50 743 472 364.12 50
JAN-JUL 931.7 83 931.7 83 931.7 83 1129 831 933.22
JAN-SEP 956.7 82 957.7 82 956.6 82 1164 853 947.87 82
OCT-SEP 1388.7 105 1389.6 105 1388.5 105 1322
ST JOE - AT CALDER APR-AUG 766.4 69 766.4 69 766.4 69 1112 745 768.61
APR-JUL 740.5 69 740.5 69 740.5 69 1076 722 742.67
APR-SEP 788.5 69 789.5 69 788.4 69 1138 763 773.12 69
JAN-JUL 1353.4 96 1353.4 96 1353.4 96 1415 1020 1354.95
JAN-SEP 1401.4 95 1402.4 95 1401.3 95 1477 1062 1385.40 95
OCT-SEP 1828.6 112 1829.5 112 1828.4 112 1636
COEUR D ALENE - COEUR D ALENE LAKE APR-AUG 1338.5 54 1338.5 54 1338.5 54 2470 1484 1345.36
APR-JUL 1331.0 55 1331.0 55 1331.0 55 2428 1473 1335.74
APR-SEP 1352.7 54 1353.3 54 1352.6 54 2504 1499 1350.75 55
JAN-JUL 3104.6 80 3104.6 80 3104.6 80 3868 2717 3109.17
JAN-SEP 3126.3 79 3126.8 79 3126.1 79 3945 2744 3124.18 80
OCT-SEP 4265.7 96 4266.3 96 4265.6 96 4461
SPOKANE - AT SPOKANE APR-AUG 1413.0 56 1413.0 56 1413.0 56 2540 1553 1418.77
APR-JUL 1391.9 56 1391.9 56 1391.9 56 2475 1526 1396.61
APR-SEP 1436.2 56 1436.9 56 1436.1 56 2587 1570 1426.17 56
JAN-JUL 3162.2 81 3162.2 81 3162.2 81 3926 2778 3166.74
JAN-SEP 3206.5 79 3207.2 79 3206.4 79 4038 2823 3196.30 80
OCT-SEP 4308.9 94 4309.5 94 4308.7 94 4584
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
SPOKANE - AT LONGLAKE APR-AUG 1588.6 56 1588.6 56 1588.6 56 2817 1705 1594.05
APR-JUL 1533.4 57 1533.4 57 1533.4 57 2714 1649 1538.85
APR-SEP 1648.4 57 1649.4 57 1648.1 57 2901 1753 1607.38 57
JAN-JUL 3463.8 78 3463.8 78 3463.8 78 4433 3084 3468.84
JAN-SEP 3578.8 77 3579.8 77 3578.5 77 4619 3189 3537.37 78
OCT-SEP 4774.0 90 4775.0 90 4773.7 90 5295
COLUMBIA - GRAND COULEE DAM APR-AUG 53373.9 92 53373.9 92 53373.9 92 58186 45448 53424.42
APR-JUL 49082.8 93 49082.8 93 49082.8 93 52774 40738 49133.27
APR-SEP 56004.3 91 56172.7 91 55900.2 91 61483 48260 53998.60 92
JAN-JUL 61961.4 100 61961.4 100 61961.4 100 61749 48445 61978.13
JAN-SEP 68883.0 98 69051.4 98 68778.9 98 70457 55967 66843.46 99
OCT-SEP 79441.2 101 79609.6 101 79337.1 101 78842
SIMILKAMEEN - NEAR NIGHTHAWK APR-AUG 959.7 72 959.7 72 959.7 72 1335 664 961.40
APR-JUL 942.4 73 942.4 73 942.4 73 1286 646 944.08
APR-SEP 978.2 72 980.2 72 977.3 72 1366 675 964.04 72
JAN-JUL 1351.4 94 1351.4 94 1351.4 94 1443 745 1352.51
JAN-SEP 1387.2 91 1389.2 91 1386.3 91 1522 774 1372.47 92
OCT-SEP 1713.8 101 1715.8 101 1713.0 101 1692
OKANOGAN - NEAR TONASKET APR-AUG 1009.0 61 1009.0 61 1009.0 61 1656 855 1010.81
APR-JUL 977.4 62 977.4 62 977.4 62 1566 815 979.19
APR-SEP 1043.3 61 1046.4 61 1042.0 61 1720 889 1016.09 61
JAN-JUL 1430.5 78 1430.5 78 1430.5 78 1832 977 1431.84
JAN-SEP 1496.4 75 1499.5 76 1495.2 75 1986 1051 1468.74 76
OCT-SEP 1879.8 84 1882.9 84 1878.5 84 2238
METHOW - NEAR PATEROS APR-AUG 805.8 86 805.8 86 805.8 86 942 679 807.15
APR-JUL 785.7 87 785.7 87 785.7 87 904 659 787.07
APR-SEP 823.6 85 824.0 85 823.4 85 965 695 810.08 86
JAN-JUL 1095.9 109 1095.9 109 1095.9 109 1001 744 1096.75
JAN-SEP 1133.8 107 1134.2 107 1133.6 107 1063 781 1119.76 107
OCT-SEP 1363.5 117 1363.9 117 1363.3 117 1162
STEHEKIN - AT STEHEKIN APR-AUG 581.5 75 581.5 75 581.5 75 778 559 582.26
APR-JUL 550.8 78 550.8 78 550.8 78 710 522 551.59
APR-SEP 595.2 73 599.1 74 594.6 73 814 580 585.06 75
JAN-JUL 774.8 96 774.8 96 774.8 96 809 612 775.09
JAN-SEP 819.1 90 823.1 90 818.6 90 913 671 808.56 91
OCT-SEP 1099.5 105 1103.4 105 1098.9 105 1046
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
CHELAN - LAKE CHELAN DAM APR-AUG 828.1 75 828.1 75 828.1 75 1102 772 829.91
APR-JUL 790.9 77 790.9 77 790.9 77 1029 732 792.21
APR-SEP 843.5 74 849.6 75 843.0 74 1139 790 834.45 75
JAN-JUL 1198.8 99 1198.8 99 1198.8 99 1217 886 1199.55
JAN-SEP 1251.4 94 1257.4 95 1250.9 94 1326 943 1241.79 96
OCT-SEP 1705.0 112 1711.1 113 1704.5 112 1518
WENATCHEE - AT PESHASTIN APR-AUG 944.8 65 944.8 65 944.8 65 1454 1082 947.16
APR-JUL 912.8 66 912.8 66 912.8 66 1379 1046 915.23
APR-SEP 968.6 65 969.0 65 968.6 65 1496 1104 951.17 65
JAN-JUL 1626.1 94 1626.1 94 1626.1 94 1726 1337 1627.62
JAN-SEP 1681.9 91 1682.3 91 1681.9 91 1842 1394 1663.56 92
OCT-SEP 2444.2 112 2444.6 112 2444.2 112 2175
COLUMBIA - BLO ROCK ISLAND DAM APR-AUG 57187.5 89 57187.5 89 57187.5 89 64028 49150 57244.37
APR-JUL 52833.3 91 52833.3 91 52833.3 91 58256 44311 52890.25
APR-SEP 59974.8 89 60144.8 89 59868.5 89 67524 52003 57893.65 89
JAN-JUL 68294.8 100 68294.8 100 68294.8 100 68440 52894 68311.65
JAN-SEP 75436.3 97 75606.2 97 75330.0 97 77708 60586 73315.05 98
OCT-SEP 88086.6 101 88256.6 101 87980.3 101 87167
COLUMBIA - BLO PRIEST RAPIDS DAM APR-AUG 58005.1 90 58005.1 90 58005.1 90 64656 49743 58077.56
APR-JUL 53636.8 91 53636.8 91 53636.8 91 58905 44904 53709.30
APR-SEP 60794.2 89 60963.2 89 60687.9 89 68162 52642 58726.81 90
JAN-JUL 69348.1 100 69348.1 100 69348.1 100 69359 53727 69370.39
JAN-SEP 76505.5 97 76674.5 98 76399.1 97 78616 61465 74387.90 98
OCT-SEP 89452.8 101 89621.8 102 89346.5 101 88197
YAKIMA - NEAR MARTIN APR-AUG 74.6 60 74.6 60 74.6 60 124 91 70.94
APR-JUL 65.6 56 65.6 56 65.6 56 118 88 61.98
APR-SEP 79.2 61 82.5 64 79.0 61 129 92 71.91 57
JAN-JUL 152.4 86 152.4 86 152.4 86 176 144 152.57
JAN-SEP 166.0 88 169.3 90 165.8 88 188 147 162.50 88
OCT-SEP 278.7 112 281.9 113 278.5 112 249
KACHESS - NEAR EASTON APR-AUG 51.2 48 51.2 48 51.2 48 108 80 51.28
APR-JUL 47.6 46 47.6 46 47.6 46 104 75 47.69
APR-SEP 53.6 47 54.6 48 53.5 47 114 84 52.51 48
JAN-JUL 127.7 81 127.7 81 127.7 81 158 123 127.83
JAN-SEP 133.7 80 134.7 80 133.6 79 168 132 132.65 81
OCT-SEP 231.6 106 232.6 107 231.5 106 218
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
CLE ELUM - NEAR ROSLYN APR-AUG 183.3 45 183.3 45 183.3 45 407 290 183.82
APR-JUL 170.0 44 170.0 44 170.0 44 386 274 170.49
APR-SEP 190.8 46 193.9 46 190.7 46 419 296 185.84 45
JAN-JUL 377.1 74 377.1 74 377.1 74 512 405 377.32
JAN-SEP 398.0 73 401.0 74 397.9 73 545 426 392.67 73
OCT-SEP 690.3 103 693.4 103 690.2 103 672
YAKIMA - NEAR HORLICK APR-AUG 446.1 49 446.1 49 446.1 49 916 623 443.74
APR-JUL 419.0 48 419.0 48 419.0 48 876 602 416.68
APR-SEP 481.6 50 490.1 51 481.1 50 962 653 450.03 49
JAN-JUL 1061.0 81 1061.0 81 1061.0 81 1311 1005 1061.97
JAN-SEP 1123.5 80 1132.1 81 1123.1 80 1398 1056 1095.32 80
OCT-SEP 1894.6 109 1903.2 109 1894.1 108 1746
BUMPING - BELOW BUMPING DAM APR-AUG 68.1 57 68.1 57 68.1 57 120 90 68.37
APR-JUL 65.0 57 65.0 57 65.0 57 115 87 65.25
APR-SEP 70.7 57 71.2 57 70.7 57 125 92 68.93 57
JAN-JUL 124.0 78 124.0 78 124.0 78 158 122 124.00
JAN-SEP 129.8 77 130.3 78 129.8 77 168 127 127.68 78
OCT-SEP 210.5 102 211.0 102 210.5 102 207
TIETON - AT TIETON DAM APR-AUG 126.4 61 126.4 61 126.4 61 209 161 126.80
APR-JUL 114.5 60 114.5 60 114.5 60 191 147 114.90
APR-SEP 139.1 62 140.4 62 138.3 61 225 164 128.84 61
JAN-JUL 256.5 95 256.5 95 256.5 95 271 217 256.81
JAN-SEP 281.1 92 282.4 93 280.2 92 305 234 270.75 93
OCT-SEP 420.5 113 421.8 113 419.7 113 372
NACHES - NEAR NACHES APR-AUG 465.4 60 465.4 60 465.4 60 773 584 467.27
APR-JUL 446.6 61 446.6 61 446.6 61 737 566 448.48
APR-SEP 491.0 61 493.7 61 490.2 61 807 585 472.39 61
JAN-JUL 988.3 96 988.3 96 988.3 96 1030 790 990.09
JAN-SEP 1032.7 94 1035.4 94 1031.9 94 1100 809 1014.00 95
OCT-SEP 1601.7 124 1604.4 124 1600.9 123 1297
YAKIMA - NEAR PARKER APR-AUG 856.1 47 856.1 47 856.1 47 1804 1228 855.60
APR-JUL 808.9 47 808.9 47 808.9 47 1721 1188 808.40
APR-SEP 942.9 50 953.9 50 941.4 50 1899 1268 866.55 48
JAN-JUL 1994.2 77 1994.2 77 1994.2 77 2596 1952 1996.26
JAN-SEP 2128.2 77 2139.2 77 2126.7 77 2774 2032 2054.41 76
OCT-SEP 3435.3 101 3446.4 101 3433.8 101 3404
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
YAKIMA - AT KIONA APR-AUG 566.4 54 566.4 54 566.4 54 1043 589 569.96
APR-JUL 490.4 52 490.4 52 490.4 52 952 530 494.03
APR-SEP 697.2 61 700.2 61 696.1 61 1149 655 587.32 55
JAN-JUL 1588.2 89 1588.2 89 1588.2 89 1785 1150 1591.23
JAN-SEP 1795.0 91 1798.0 91 1793.9 90 1982 1275 1684.52 89
OCT-SEP 2610.0 104 2613.0 104 2608.9 104 2516
SNAKE - JACKSON LAKE AT DAM APR-AUG 601.4 74 601.4 74 601.4 74 816 561 602.75
APR-JUL 564.5 73 564.5 73 564.5 73 771 537 565.85
APR-SEP 624.2 74 627.2 74 623.7 73 849 581 604.89 74
JAN-JUL 679.7 78 679.7 78 679.7 78 869 626 680.10
JAN-SEP 739.3 78 742.3 78 738.8 78 947 670 719.14 78
OCT-SEP 833.4 80 836.4 80 832.9 80 1039
GREYS - AB RES NR ALPINE APR-AUG 216.4 62 216.4 62 216.4 62 350 300 216.95
APR-JUL 197.4 62 197.4 62 197.4 62 321 278 197.94
APR-SEP 231.3 62 232.2 63 231.1 62 371 317 219.71 62
JAN-JUL 261.3 72 261.3 72 261.3 72 361 309 261.47
JAN-SEP 295.3 72 296.1 72 295.0 72 412 347 283.24 72
OCT-SEP 341.3 74 342.2 74 341.0 74 461
SALT - ABV PALISADES RES NR ETNA APR-AUG 140.4 42 140.4 42 140.4 42 335 263 140.82
APR-JUL 119.0 40 119.0 40 119.0 40 301 238 119.37
APR-SEP 162.9 44 165.1 45 162.1 44 368 291 144.42 42
JAN-JUL 212.2 55 212.2 55 212.2 55 383 317 212.40
JAN-SEP 256.1 57 258.3 57 255.2 57 450 370 237.45 56
OCT-SEP 347.9 64 350.1 64 347.0 64 545
SNAKE - NEAR IRWIN APR-AUG 2440.6 73 2440.6 73 2440.6 73 3362 2683 2445.06
APR-JUL 2227.3 72 2227.3 72 2227.3 72 3097 2498 2231.79
APR-SEP 2617.8 73 2632.7 74 2614.5 73 3577 2856 2472.31 73
JAN-JUL 2819.7 79 2819.7 79 2819.7 79 3584 2927 2821.22
JAN-SEP 3210.2 79 3225.0 79 3206.8 79 4064 3285 3061.74 79
OCT-SEP 3760.6 82 3775.4 82 3757.3 81 4612
SNAKE - NEAR HEISE APR-AUG 2547.7 71 2547.7 71 2547.7 71 3605 2723 2552.48
APR-JUL 2280.8 69 2280.8 69 2280.8 69 3308 2511 2285.61
APR-SEP 2750.8 71 2765.4 72 2747.5 71 3849 2915 2586.35 71
JAN-JUL 2963.9 77 2963.9 77 2963.9 77 3871 3021 2965.68
JAN-SEP 3433.9 78 3448.5 78 3430.7 78 4413 3425 3266.42 77
OCT-SEP 4068.0 81 4082.5 81 4064.7 80 5050
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
FALL RIVER - NEAR CHESTER APR-AUG 179.1 51 179.1 51 179.1 51 352 259 179.74
APR-JUL 156.5 48 156.5 48 156.5 48 329 239 157.18
APR-SEP 199.6 53 202.3 54 198.5 53 377 281 183.67 51
JAN-JUL 259.6 62 259.6 62 259.6 62 416 318 259.92
JAN-SEP 302.6 65 305.4 66 301.6 65 464 360 286.41 65
OCT-SEP 394.8 71 397.6 71 393.8 70 559
HENRYS FORK - AT ST. ANTHONY APR-AUG 347.2 48 347.2 48 347.2 48 720 483 348.20
APR-JUL 274.7 43 274.7 43 274.7 43 639 421 275.70
APR-SEP 442.4 56 448.8 56 437.5 55 794 539 364.62 50
JAN-JUL 532.2 57 532.2 57 532.2 57 931 671 533.00
JAN-SEP 700.0 64 706.3 65 695.0 64 1086 789 621.92 61
OCT-SEP 915.2 67 921.5 68 910.3 67 1358
TETON - NEAR ST. ANTHONY APR-AUG 248.7 60 248.7 60 248.7 60 412 312 249.19
APR-JUL 214.1 58 214.1 58 214.1 58 368 283 214.58
APR-SEP 279.4 62 282.0 63 278.8 62 447 335 255.07 61
JAN-JUL 296.7 66 296.7 66 296.7 66 448 354 296.91
JAN-SEP 362.0 69 364.6 69 361.4 69 526 407 337.40 68
OCT-SEP 440.6 72 443.1 72 439.9 72 614
HENRYS FORK - AT REXBURG APR-AUG 774.1 50 774.1 50 774.1 50 1536 1040 775.84
APR-JUL 651.1 49 651.1 49 651.1 49 1335 924 652.84
APR-SEP 871.3 51 877.4 51 867.7 51 1710 1147 795.10 51
JAN-JUL 1001.6 58 1001.6 58 1001.6 58 1721 1254 1002.71
JAN-SEP 1221.8 58 1227.9 59 1218.2 58 2096 1477 1144.97 59
OCT-SEP 1542.8 61 1548.9 61 1539.2 61 2527
WILLOW CREEK - NEAR RIRIE APR-AUG 7.3 12 7.3 12 7.3 12 59 36 7.66
APR-JUL 6.5 11 6.5 11 6.5 11 58 35 6.86
APR-SEP 9.5 16 9.8 16 9.4 16 60 37 8.27 14
JAN-JUL 18.4 27 18.4 27 18.4 27 69 46 18.66
JAN-SEP 21.3 30 21.6 30 21.2 30 71 48 20.07 29
OCT-SEP 30.4 39 30.7 39 30.3 38 79
SNAKE - NEAR SHELLEY APR-AUG 2819.4 62 2819.4 62 2819.4 62 4520 3268 2824.99
APR-JUL 2477.9 61 2477.9 61 2477.9 61 4090 3015 2483.40
APR-SEP 3153.0 64 3171.6 65 3143.6 64 4905 3539 2884.22 63
JAN-JUL 3457.3 71 3457.3 71 3457.3 71 4841 3825 3460.01
JAN-SEP 4132.5 73 4151.1 73 4123.1 73 5656 4349 3860.83 72
OCT-SEP 5011.1 76 5029.8 76 5001.8 76 6605
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
PORTNEUF - AT TOPAZ APR-AUG 38.2 58 38.2 58 38.2 58 66 55 38.30
APR-JUL 33.8 59 33.8 59 33.8 59 58 47 33.90
APR-SEP 42.9 59 43.5 60 42.8 59 72 61 39.00 58
JAN-JUL 58.5 70 58.5 70 58.5 70 83 74 58.55
JAN-SEP 67.6 69 68.2 70 67.4 69 98 88 63.65 68
OCT-SEP 89.0 75 89.6 76 88.8 75 118
SNAKE - AT AMERICAN FALLS DAM APR-AUG 545.3 22 545.3 22 545.3 22 2531 1100 651.82
APR-JUL 622.1 25 622.1 25 622.1 25 2529 1248 677.80
APR-SEP 647.0 25 664.8 25 638.0 24 2624 1124 657.37 26
JAN-JUL 1761.5 48 1761.5 48 1761.5 48 3651 2268 1816.08
JAN-SEP 1786.5 48 1804.2 48 1777.4 47 3745 2144 1795.65 49
OCT-SEP 2873.7 59 2891.5 59 2864.7 59 4883
SALMON FALLS CREEK - NR SAN JACINTO APR-AUG 9.9 15 9.9 15 9.9 15 66 35 9.93
APR-JUL 9.0 14 9.0 14 9.0 14 65 35 9.01
APR-SEP 10.8 16 11.0 16 10.7 16 68 37 10.10 15
JAN-JUL 22.5 26 22.5 26 22.5 26 87 53 22.50
JAN-SEP 24.3 27 24.5 27 24.2 27 90 55 23.59 27
OCT-SEP 33.8 34 34.0 34 33.7 34 100
BIG LOST - AT HOWELL RANCH NEAR CHILLY APR-AUG 137.7 84 137.7 84 137.7 84 165 109 137.86
APR-JUL 130.1 84 130.1 84 130.1 84 154 103 130.27
APR-SEP 143.0 83 143.2 83 142.9 83 172 113 138.89 84
JAN-JUL 155.6 92 155.6 92 155.6 92 168 117 155.69
JAN-SEP 168.6 91 168.8 91 168.5 91 186 127 164.31 91
OCT-SEP 186.6 91 186.8 91 186.5 91 204
BIG LOST - MACKAY RESERVOIR NEAR MACKAY APR-AUG 94.0 75 94.0 75 94.0 75 126 79 94.08
APR-JUL 83.4 74 83.4 74 83.4 74 113 69 83.46
APR-SEP 102.6 75 102.9 76 102.5 75 136 94 95.81 75
JAN-JUL 110.2 78 110.2 78 110.2 78 141 94 110.23
JAN-SEP 129.4 79 129.7 79 129.3 79 164 119 122.58 79
OCT-SEP 159.1 81 159.4 81 159.0 81 197
BIG WOOD - AT HAILEY APR-AUG 169.2 69 169.2 69 169.2 69 246 164 169.51
APR-JUL 160.7 69 160.7 69 160.7 69 232 157 161.01
APR-SEP 176.4 69 176.7 69 176.2 69 257 171 170.75 69
JAN-JUL 207.6 79 207.6 79 207.6 79 263 185 207.69
JAN-SEP 223.3 77 223.6 77 223.2 77 289 199 217.43 78
OCT-SEP 254.5 79 254.8 79 254.4 79 321
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
BIG WOOD - MAGIC DAM APR-AUG 91.1 39 91.1 39 91.1 39 235 131 91.38
APR-JUL 88.2 39 88.2 39 88.2 39 227 123 88.52
APR-SEP 92.9 39 93.6 39 92.5 38 240 134 91.70 39
JAN-JUL 131.2 48 131.2 48 131.2 48 273 186 131.28
JAN-SEP 135.9 47 136.6 48 135.5 47 286 197 134.46 48
OCT-SEP 154.7 50 155.4 51 154.3 50 307
LITTLE WOOD - NEAR CAREY APR-AUG 38.3 52 38.3 52 38.3 52 74 34 38.41
APR-JUL 35.8 50 35.8 50 35.8 50 71 33 35.86
APR-SEP 41.0 53 41.3 54 40.9 53 77 34 38.86 52
JAN-JUL 53.8 61 53.8 61 53.8 61 89 45 53.90
JAN-SEP 59.0 63 59.3 63 58.9 63 94 46 56.90 62
OCT-SEP 70.5 68 70.8 68 70.4 68 104
SNAKE - AT KING HILL APR-AUG 1973.4 67 1973.4 67 1973.4 67 2925 2143 1976.46
APR-JUL 1542.4 63 1542.4 63 1542.4 63 2450 1751 1545.45
APR-SEP 2386.1 70 2434.1 71 2380.2 70 3412 2575 2043.04 68
JAN-JUL 2610.7 63 2610.7 63 2610.7 63 4129 2848 2613.80
JAN-SEP 3454.3 68 3502.3 69 3448.5 68 5090 3672 3111.39 66
OCT-SEP 4684.5 71 4732.5 71 4678.7 71 6626
BRUNEAU - NEAR HOT SPRINGS APR-AUG 31.7 18 31.7 18 31.7 18 180 118 31.76
APR-JUL 30.3 17 30.3 17 30.3 17 176 115 30.35
APR-SEP 33.4 18 33.9 19 33.2 18 183 121 32.00 18
JAN-JUL 57.7 27 57.7 27 57.7 27 217 165 57.73
JAN-SEP 60.8 27 61.3 27 60.6 27 225 171 59.38 27
OCT-SEP 77.6 32 78.1 32 77.4 32 242
SNAKE - BELOW SWAN FALLS APR-AUG 1598.3 57 1598.3 57 1598.3 57 2812 1913 1600.54
APR-JUL 1255.1 52 1255.1 52 1255.1 52 2405 1588 1257.39
APR-SEP 1958.4 60 1999.2 61 1953.4 60 3258 2321 1655.23 57
JAN-JUL 2377.5 57 2377.5 57 2377.5 57 4166 2798 2380.81
JAN-SEP 3080.8 61 3121.5 62 3075.8 61 5020 3531 2778.65 60
OCT-SEP 4366.3 66 4407.1 67 4361.4 66 6584
OWYHEE - OWYHEE DAM APR-AUG 65.3 20 65.3 20 65.3 20 321 228 65.46
APR-JUL 56.5 18 56.5 18 56.5 18 307 211 56.60
APR-SEP 75.9 23 77.8 23 75.2 22 336 242 67.72 21
JAN-JUL 123.5 23 123.5 23 123.5 23 547 597 123.72
JAN-SEP 142.9 25 144.8 25 142.3 25 575 628 134.84 24
OCT-SEP 198.9 31 200.8 31 198.2 31 641
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
SF BOISE - ANDERSON RANCH DAM APR-AUG 293.0 61 293.0 61 293.0 61 480 429 293.70
APR-JUL 277.8 60 277.8 60 277.8 60 462 410 278.57
APR-SEP 306.1 62 306.9 62 305.7 62 495 443 296.01 61
JAN-JUL 390.3 71 390.3 71 390.3 71 550 489 393.90
JAN-SEP 418.5 72 419.3 72 418.1 72 583 521 411.34 72
OCT-SEP 500.4 79 501.3 79 500.1 78 637
BOISE - LUCKY PEAK DAM APR-AUG 773.6 60 773.6 60 773.6 60 1284 1163 774.95
APR-JUL 741.2 60 741.2 60 741.2 60 1232 1121 742.55
APR-SEP 807.4 61 809.3 61 806.7 61 1329 1202 781.06 60
JAN-JUL 1064.5 68 1064.5 68 1064.5 68 1566 1440 1068.86
JAN-SEP 1130.8 68 1132.6 68 1130.0 68 1663 1521 1107.37 68
OCT-SEP 1359.7 74 1361.5 74 1358.9 74 1829
BOISE - NEAR PARMA APR-AUG 338.7 64 338.7 64 338.7 64 531 389 338.89
APR-JUL 309.9 64 309.9 64 309.9 64 486 351 310.05
APR-SEP 389.8 67 390.9 67 389.4 67 584 442 345.79 64
JAN-JUL 449.0 59 449.0 59 449.0 59 761 620 449.40
JAN-SEP 528.9 62 530.0 62 528.5 62 859 712 485.14 59
OCT-SEP 688.6 67 689.7 67 688.2 67 1023
MALHEUR - NEAR DREWSEY APR-AUG 12.6 20 12.6 20 12.6 20 64 116 12.68
APR-JUL 12.5 20 12.5 20 12.5 20 64 115 12.56
APR-SEP 12.7 20 12.8 20 12.7 20 65 117 12.70 20
JAN-JUL 36.3 31 36.3 31 36.3 31 116 264 36.30
JAN-SEP 36.4 31 36.5 31 36.4 31 117 266 36.44 31
OCT-SEP 50.7 39 50.8 39 50.7 39 130
NF MALHEUR - AT BEULAH APR-AUG 16.1 28 16.1 28 16.1 28 57 76 16.14
APR-JUL 14.5 27 14.5 27 14.5 27 54 74 14.59
APR-SEP 17.2 29 17.3 29 17.2 29 59 78 16.50 29
JAN-JUL 30.4 36 30.4 36 30.4 36 84 138 30.44
JAN-SEP 33.1 37 33.2 37 33.1 37 89 143 32.35 37
OCT-SEP 44.9 45 45.0 45 44.9 45 101
DEADWOOD - BELOW DEADWOOD RES APR-AUG 98.4 75 98.4 75 98.4 75 131 128 99.16
APR-JUL 96.0 77 96.0 77 96.0 77 125 126 96.27
APR-SEP 102.0 76 102.3 76 101.9 75 135 132 100.09 76
JAN-JUL 127.3 89 127.3 89 127.3 89 143 142 127.43
JAN-SEP 133.4 87 133.6 88 133.3 87 153 147 131.25 88
OCT-SEP 158.4 94 158.7 94 158.3 94 168
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
NF PAYETTE - CASCADE DAM APR-AUG 323.3 69 323.3 69 323.3 69 470 452 324.46
APR-JUL 319.3 69 319.3 69 319.3 69 463 444 320.13
APR-SEP 333.2 68 337.8 69 331.4 68 487 466 325.05 69
JAN-JUL 478.8 83 478.8 83 478.8 83 576 554 479.34
JAN-SEP 492.7 82 497.3 83 490.9 82 600 576 484.26 82
OCT-SEP 621.4 91 625.9 91 619.5 90 685
PAYETTE - NEAR HORSESHOE BEND APR-AUG 1148.3 75 1148.3 75 1148.3 75 1540 1567 1151.15
APR-JUL 1106.0 75 1106.0 75 1106.0 75 1484 1515 1108.83
APR-SEP 1198.3 75 1204.8 75 1195.3 75 1597 1622 1160.82 75
JAN-JUL 1582.8 85 1582.8 85 1582.8 85 1854 1892 1584.22
JAN-SEP 1675.1 85 1681.7 85 1672.2 85 1968 2000 1636.21 85
OCT-SEP 2024.7 92 2031.2 92 2021.7 92 2208
PAYETTE - NEAR EMMETT APR-AUG 1128.4 88 1128.4 88 1128.4 88 1277 1291 1130.37
APR-JUL 1031.5 88 1031.5 88 1031.5 88 1179 1171 1033.46
APR-SEP 1158.7 87 1161.7 88 1157.8 87 1325 1333 1136.92 88
JAN-JUL 1431.7 90 1431.7 90 1431.7 90 1589 1642 1432.81
JAN-SEP 1558.9 90 1562.0 90 1558.1 90 1736 1804 1536.27 91
OCT-SEP 1807.4 93 1810.4 93 1806.5 93 1947
WEISER - NEAR WEISER APR-AUG 258.3 68 258.3 68 258.3 68 380 373 258.95
APR-JUL 243.9 67 243.9 67 243.9 67 365 359 244.55
APR-SEP 270.5 69 271.1 70 270.4 69 389 382 261.36 69
JAN-JUL 432.4 67 432.4 67 432.4 67 645 757 432.79
JAN-SEP 459.0 69 459.5 69 458.9 69 669 780 449.60 68
OCT-SEP 531.1 73 531.7 73 531.0 73 726
SNAKE - AT WEISER APR-AUG 3437.1 65 3437.1 65 3437.1 65 5311 4346 3442.78
APR-JUL 2942.2 62 2942.2 62 2942.2 62 4718 3817 2947.93
APR-SEP 3975.9 67 4022.2 68 3968.1 67 5956 4961 3527.11 65
JAN-JUL 4953.5 64 4953.5 64 4953.5 64 7719 6890 4959.32
JAN-SEP 5987.3 67 6033.5 67 5979.4 67 8957 8035 5538.50 66
OCT-SEP 7984.8 71 8031.1 72 7976.9 71 11199
BURNT - Unity Dam & Burnt RVR NR Hereford APR-AUG 5.7 19 5.7 19 5.7 19 30 38 5.97
APR-JUL 3.4 12 3.4 12 3.4 12 30 38 3.70
APR-SEP 6.1 20 6.4 21 6.1 20 31 39 6.13 20
JAN-JUL 15.5 31 15.5 31 15.5 31 50 70 15.67
JAN-SEP 18.2 35 18.5 36 18.2 35 51 72 18.10 36
OCT-SEP 25.9 45 26.2 45 25.9 45 58
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
EAGLE CREEK - ABOVE SKULL CK APR-AUG 89.6 53 89.6 53 89.6 53 169 185 89.75
APR-JUL 85.3 53 85.3 53 85.3 53 161 178 85.41
APR-SEP 93.5 54 93.5 54 93.5 54 174 190 90.47 53
JAN-JUL 116.0 62 116.0 62 116.0 62 188 205 116.12
JAN-SEP 124.2 62 124.2 62 124.2 62 201 218 121.18 62
OCT-SEP 148.9 67 148.9 67 148.9 67 221
SNAKE - BROWNLEE DAM APR-AUG 3579.8 62 3579.8 62 3579.8 62 5736 4812 3586.62
APR-JUL 3076.3 60 3076.3 60 3076.3 60 5125 4267 3083.14
APR-SEP 4152.3 65 4196.2 66 4143.9 65 6398 5436 3679.22 63
JAN-JUL 5263.3 63 5263.3 63 5263.3 63 8326 7650 5270.42
JAN-SEP 6339.3 66 6383.2 66 6330.9 66 9600 8819 5866.50 65
OCT-SEP 8431.5 71 8475.4 71 8423.1 71 11906
SNAKE - AT HELLS CANYON DAM APR-AUG 3690.2 61 3690.2 61 3690.2 61 6046 5036 3697.73
APR-JUL 3175.1 58 3175.1 58 3175.1 58 5429 4486 3182.62
APR-SEP 4246.4 63 4290.3 64 4237.9 63 6725 5670 3773.95 61
JAN-JUL 5448.8 62 5448.8 62 5448.8 62 8834 7970 5455.18
JAN-SEP 6520.1 64 6564.0 65 6511.7 64 10130 9154 6046.51 63
OCT-SEP 8634.8 69 8678.8 69 8626.4 69 12500
IMNAHA - AT IMNAHA APR-AUG 127.1 47 127.1 47 127.1 47 269 235 127.39
APR-JUL 121.3 47 121.3 47 121.3 47 258 226 121.54
APR-SEP 132.9 48 132.9 48 132.9 48 277 242 128.53 47
JAN-JUL 176.6 56 176.6 56 176.6 56 315 283 176.81
JAN-SEP 188.3 56 188.3 56 188.3 56 334 299 183.80 56
OCT-SEP 224.7 61 224.7 61 224.7 61 366
SALMON - AT SALMON APR-AUG 693.1 79 693.1 79 693.1 79 873 696 694.48
APR-JUL 639.0 79 639.0 79 639.0 79 810 647 640.28
APR-SEP 746.8 80 748.4 81 745.9 80 929 745 702.98 80
JAN-JUL 877.9 87 877.9 87 877.9 87 1008 837 878.44
JAN-SEP 985.7 88 987.3 88 984.8 87 1126 935 941.14 87
OCT-SEP 1215.2 90 1216.8 90 1214.3 90 1346
SALMON - AT WHITEBIRD APR-AUG 4634.2 78 4634.2 78 4634.2 78 5917 4961 4643.23
APR-JUL 4399.4 78 4399.4 78 4399.4 78 5614 4730 4408.38
APR-SEP 4859.5 79 4863.4 79 4857.9 79 6158 5162 4680.12 78
JAN-JUL 5704.5 87 5704.5 87 5704.5 87 6555 5601 5707.57
JAN-SEP 6164.7 87 6168.6 87 6163.1 87 7099 6032 5979.31 87
OCT-SEP 7179.5 90 7183.3 90 7177.8 90 7958
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
GRANDE RONDE - NEAR PERRY APR-AUG 51.1 29 51.1 29 51.1 29 174 82 51.23
APR-JUL 51.0 30 51.0 30 51.0 30 172 82 51.10
APR-SEP 52.0 30 52.3 30 51.9 30 176 83 51.36 29
JAN-JUL 97.9 36 97.9 36 97.9 36 271 205 97.99
JAN-SEP 98.9 36 99.2 36 98.8 36 274 206 98.25 36
OCT-SEP 116.0 40 116.3 40 115.9 40 291
LOSTINE - NR LOSTINE APR-AUG 66.3 59 66.3 59 66.3 59 113 88 66.34
APR-JUL 63.9 59 63.9 59 63.9 59 108 85 63.94
APR-SEP 68.8 60 69.5 60 68.7 59 116 90 66.68 59
JAN-JUL 78.8 66 78.8 66 78.8 66 119 93 78.82
JAN-SEP 83.7 66 84.5 67 83.6 66 126 99 81.56 66
OCT-SEP 96.1 70 96.9 71 96.0 70 137
GRANDE RONDE - TROY APR-AUG 622.4 48 622.4 48 622.4 48 1293 936 624.11
APR-JUL 594.7 48 594.7 48 594.7 48 1251 906 596.38
APR-SEP 652.6 49 653.5 49 652.0 49 1331 965 629.25 48
JAN-JUL 1148.9 61 1148.9 61 1148.9 61 1872 1557 1150.13
JAN-SEP 1206.8 62 1207.8 62 1206.2 62 1952 1616 1183.00 62
OCT-SEP 1461.3 67 1462.3 67 1460.8 67 2170
SNAKE - LOWER GRANITE DAM APR-AUG 14554.5 69 14554.5 69 14554.5 69 21121 16674 14586.26
APR-JUL 13687.6 69 13687.6 69 13687.6 69 19946 15809 13719.30
APR-SEP 15497.5 70 15555.4 70 15482.3 70 22232 17594 14713.98 69
JAN-JUL 21188.9 77 21188.9 77 21188.9 77 27450 22893 21207.25
JAN-SEP 22998.8 77 23056.7 78 22983.6 77 29736 24677 22201.93 77
OCT-SEP 28235.4 82 28293.4 83 28220.2 82 34287
CLEARWATER - AT OROFINO APR-AUG 3413.2 75 3413.2 75 3413.2 75 4539 3507 3421.72
APR-JUL 3320.9 75 3320.9 75 3320.9 75 4417 3422 3329.42
APR-SEP 3508.8 76 3521.4 76 3507.2 76 4632 3573 3437.23 75
JAN-JUL 5072.9 92 5072.9 92 5072.9 92 5531 4453 5076.72
JAN-SEP 5260.8 92 5273.4 92 5259.2 92 5745 4603 5184.53 91
OCT-SEP 6253.4 99 6266.0 99 6251.8 99 6313
NF CLEARWATER - DWORSHAK DAM APR-AUG 1882.5 74 1882.5 74 1882.5 74 2554 1819 1886.89
APR-JUL 1832.4 74 1832.4 74 1832.4 74 2474 1768 1836.82
APR-SEP 1932.0 74 1935.8 74 1930.2 74 2620 1857 1896.96 74
JAN-JUL 3133.7 92 3133.7 92 3133.7 92 3397 2620 3136.71
JAN-SEP 3233.3 91 3237.2 91 3231.6 91 3543 2708 3196.85 92
OCT-SEP 4118.7 103 4122.5 103 4117.0 103 3998
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
CLEARWATER - AT SPALDING APR-AUG 5365.4 73 5365.4 73 5365.4 73 7319 5441 5378.25
APR-JUL 5203.1 73 5203.1 73 5203.1 73 7117 5295 5215.99
APR-SEP 5531.1 74 5549.3 74 5526.8 74 7481 5552 5407.65 74
JAN-JUL 8562.5 91 8562.5 91 8562.5 91 9421 7403 8569.59
JAN-SEP 8890.5 91 8908.6 91 8886.2 91 9785 7660 8761.25 91
OCT-SEP 10823.5 100 10841.6 100 10819.2 100 10841
COLUMBIA - MCNARY DAM APR-AUG 71677.3 81 71677.3 81 71677.3 81 88088 65657 71781.06
APR-JUL 66400.9 82 66400.9 82 66400.9 82 80726 60057 66504.62
APR-SEP 75642.4 82 75812.4 82 75539.0 81 92790 69577 72642.04 82
JAN-JUL 89641.6 90 89641.6 90 89641.6 90 99964 76729 89684.35
JAN-SEP 98883.1 88 99053.1 88 98779.7 88 112028 86249 95821.77 89
OCT-SEP 117024.3 92 117194.2 92 116920.9 92 126785
UMATILLA - NEAR GIBBON APR-AUG 52.0 65 52.0 65 52.0 65 80 54 52.13
APR-JUL 49.7 64 49.7 64 49.7 64 77 51 49.83
APR-SEP 54.6 66 54.6 66 54.5 66 82 58 52.57 65
JAN-JUL 117.6 81 117.6 81 117.6 81 145 130 117.66
JAN-SEP 122.5 82 122.5 82 122.4 82 150 137 120.40 81
OCT-SEP 152.3 87 152.3 88 152.3 87 174
UMATILLA - AT PENDLETON APR-AUG 104.0 67 104.0 67 104.0 67 155 88 104.27
APR-JUL 102.2 67 102.2 67 102.2 67 152 86 102.45
APR-SEP 106.4 67 106.5 68 106.4 67 158 90 104.70 67
JAN-JUL 233.7 72 233.7 72 233.7 72 326 281 233.88
JAN-SEP 237.9 72 238.1 72 237.9 72 331 286 236.13 72
OCT-SEP 296.1 78 296.3 78 296.1 78 380
NF JOHN DAY - AT MONUMENT APR-AUG 206.5 37 206.5 37 206.5 37 558 499 206.98
APR-JUL 204.7 37 204.7 37 204.7 37 551 494 205.23
APR-SEP 210.7 37 211.1 37 210.4 37 564 505 207.40 37
JAN-JUL 369.6 43 369.6 43 369.6 43 869 1042 370.03
JAN-SEP 375.6 43 376.0 43 375.4 43 883 1053 372.20 42
OCT-SEP 450.8 48 451.2 48 450.6 48 945
JOHN DAY - AT SERVICE CK APR-AUG 272.7 35 272.7 35 272.7 35 790 757 273.47
APR-JUL 271.4 35 271.4 35 271.4 35 781 748 272.11
APR-SEP 275.2 34 276.5 35 274.7 34 798 767 273.70 35
JAN-JUL 537.8 43 537.8 43 537.8 43 1262 1629 538.35
JAN-SEP 541.6 42 542.9 42 541.2 42 1279 1648 539.94 42
OCT-SEP 659.2 47 660.5 47 658.8 47 1392
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
COLUMBIA - JOHN DAY DAM APR-AUG 73364.3 84 73364.3 84 73364.3 84 87643 67401 73471.86
APR-JUL 67876.4 84 67876.4 84 67876.4 84 80636 61843 67983.89
APR-SEP 77331.9 84 77499.7 84 77228.2 84 92354 71335 74285.03 84
JAN-JUL 92797.1 92 92797.1 92 92797.1 92 101178 80095 92842.19
JAN-SEP 102252.6 91 102420.4 91 102148.9 90 112896 89587 99143.33 91
OCT-SEP 121412.5 95 121580.4 95 121308.8 95 128295
DESCHUTES - AT MOODY NR BIGGS APR-AUG 1182.2 72 1182.2 72 1182.2 72 1637 1513 1184.55
APR-JUL 944.8 69 944.8 69 944.8 69 1365 1259 947.10
APR-SEP 1425.2 75 1425.6 75 1425.1 75 1902 1775 1223.85 72
JAN-JUL 1808.0 70 1808.0 70 1808.0 70 2590 2631 1810.45
JAN-SEP 2288.4 73 2288.8 73 2288.3 73 3127 3147 2087.20 72
OCT-SEP 3207.0 78 3207.4 78 3206.9 78 4118
COLUMBIA - THE DALLES DAM APR-AUG 73613.8 83 73613.8 83 73613.8 83 89196 67993 73724.18
APR-JUL 67976.3 83 67976.3 83 67976.3 83 81933 62272 68086.63
APR-SEP 77747.9 83 77915.5 83 77644.3 82 94166 72162 74562.16 83
JAN-JUL 93172.0 90 93172.0 90 93172.0 90 103714 81428 93222.35
JAN-SEP 102943.7 89 103111.2 89 102840.1 89 115946 91317 99697.88 89
OCT-SEP 122829.2 93 122996.7 93 122725.6 93 132314
COLUMBIA - BONNEVILLE DAM APR-AUG 72078.1 80 72078.1 80 72078.1 80 90174 67995 72187.19
APR-JUL 66754.3 81 66754.3 81 66754.3 81 82678 62214 66863.40
APR-SEP 76300.1 80 76467.4 80 76197.3 80 95202 72318 73047.19 80
JAN-JUL 92613.5 88 92613.5 88 92613.5 88 105246 82523 92664.44
JAN-SEP 102159.2 87 102326.6 87 102056.4 87 117770 92627 98848.23 87
OCT-SEP 123108.8 92 123276.1 92 123005.9 91 134527
MCKENZIE - NEAR VIDA APR-AUG 713.7 65 713.7 65 713.7 65 1091 891 715.04
APR-JUL 603.8 62 603.8 62 603.8 62 978 760 605.14
APR-SEP 815.2 68 826.9 69 813.5 68 1195 995 732.73 66
JAN-JUL 1281.8 64 1281.8 64 1281.8 64 2001 1924 1284.10
JAN-SEP 1493.2 67 1504.8 68 1491.5 67 2219 2160 1411.69 66
OCT-SEP 2095.8 71 2107.4 71 2094.1 71 2951
NORTH SANTIAM - AT MEHAMA APR-AUG 406.4 51 406.4 51 406.4 51 802 501 407.02
APR-JUL 374.5 50 374.5 50 374.5 50 753 461 375.11
APR-SEP 442.1 52 453.7 53 440.1 51 855 539 414.76 51
JAN-JUL 1148.1 67 1148.1 67 1148.1 67 1703 1440 1149.26
JAN-SEP 1215.6 67 1227.2 68 1213.7 67 1805 1518 1188.91 67
OCT-SEP 2022.8 80 2034.4 81 2020.8 80 2522
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
SOUTH SANTIAM - AT WATERLOO APR-AUG 285.8 50 285.8 50 285.8 50 571 297 286.71
APR-JUL 276.4 50 276.4 50 276.4 50 558 287 277.31
APR-SEP 297.5 50 307.4 52 296.3 50 590 307 290.20 50
JAN-JUL 931.0 64 931.0 64 931.0 64 1462 1269 932.28
JAN-SEP 952.1 64 962.1 64 950.9 64 1494 1289 945.17 64
OCT-SEP 1526.1 71 1536.1 72 1524.9 71 2146
WILLAMETTE - AT SALEM APR-AUG 2486.3 55 2486.3 55 2486.3 55 4539 3194 2493.03
APR-JUL 2340.1 54 2340.1 54 2340.1 54 4324 3012 2346.80
APR-SEP 2644.0 56 2724.3 57 2632.7 55 4754 3379 2526.23 55
JAN-JUL 7229.9 63 7229.9 63 7229.9 63 11461 11343 7240.21
JAN-SEP 7533.8 63 7614.1 64 7522.5 63 11890 11710 7419.64 63
OCT-SEP 11093.9 68 11174.3 68 11082.7 68 16315
CLACKAMAS - AT ESTACADA APR-AUG 357.4 53 357.4 53 357.4 53 677 464 358.42
APR-JUL 316.8 51 316.8 51 316.8 51 624 426 317.81
APR-SEP 401.6 55 408.4 56 399.9 55 733 505 365.97 53
JAN-JUL 887.3 66 887.3 66 887.3 66 1341 1108 888.28
JAN-SEP 972.1 67 978.9 68 970.5 67 1450 1187 936.44 67
OCT-SEP 1515.7 77 1522.5 77 1514.0 77 1975
LEWIS - MERWIN DAM APR-AUG 579.1 60 579.1 60 579.1 60 969 714 581.33
APR-JUL 531.6 60 531.6 60 531.6 60 881 664 533.91
APR-SEP 616.4 57 633.3 59 615.3 57 1082 757 590.59 60
JAN-JUL 1761.7 82 1761.7 82 1761.7 82 2162 1800 1763.65
JAN-SEP 1846.4 78 1863.3 79 1845.3 78 2363 1893 1820.33 80
OCT-SEP 3131.2 92 3148.1 92 3130.1 92 3417
COWLITZ - MAYFIELD RESERVOIR APR-AUG 972.4 55 972.4 55 972.4 55 1765 1175 976.05
APR-JUL 901.9 55 901.9 55 901.9 55 1648 1088 905.55
APR-SEP 1040.5 56 1054.9 57 1038.6 56 1864 1240 989.53 55
JAN-JUL 2514.8 78 2514.8 78 2514.8 78 3204 2336 2518.27
JAN-SEP 2653.5 78 2667.8 78 2651.6 78 3420 2488 2602.25 78
OCT-SEP 4595.9 99 4610.3 100 4594.0 99 4624
COWLITZ - AT CASTLE ROCK APR-AUG 1440.5 61 1440.5 61 1440.5 61 2366 1508 1446.01
APR-JUL 1351.4 61 1351.4 61 1351.4 61 2213 1394 1356.87
APR-SEP 1520.6 61 1547.9 62 1518.1 61 2504 1590 1461.96 61
JAN-JUL 4106.9 89 4106.9 89 4106.9 89 4638 3336 4113.30
JAN-SEP 4276.0 87 4303.4 87 4273.5 87 4929 3532 4218.39 88
OCT-SEP 7087.9 105 7115.2 106 7085.4 105 6739
---------------------Forecast --------------------- ----------Runoff-----------
River Basin Period Probable % Maximum % Minimum % Average PrevYR CurYR %
ROGUE - AT RAYGOLD APR-AUG 396.6 52 396.6 52 396.6 52 759 757 397.59
APR-JUL 344.6 50 344.6 50 344.6 50 687 681 345.50
APR-SEP 453.8 55 459.5 55 452.6 54 831 833 408.80 53
JAN-JUL 806.9 56 806.9 56 806.9 56 1442 1832 807.92
JAN-SEP 916.1 58 921.9 58 914.9 58 1586 1984 871.22 57
OCT-SEP 1250.8 62 1256.5 62 1249.6 62 2032
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