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Water Supply Forecasts Northwest River Forecast Center Thursday May 01, 2008 at 21:16 GMT Observed precipitation through the 28th Future precip 90% of normal for the first half of MAY and 100% of normal for the rest of the period Snow included in this run Full complement runoff applied note: runoff based on ESP forecast for entire month of APR UPPER COLUMBIA BASINS May-08 EarlyBird ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % COLUMBIA RIVER MICA RESERVOIR INFLOW, BC JAN-JUL 9760.0 101 11100.0 115 8460.0 88 9619. 9985 2364 93 FEB-SEP 13100.0 101 14400.0 111 11800.0 91 12960. 12300 2364 93 APR-SEP 12700.0 102 14000.0 112 11400.0 91 12500. 11850 2364 93 REVELSTOKE, BC JAN-JUL 14000.0 101 15100.0 109 12900.0 93 13880. 14190 3448 92 ARROW LAKES INFLOW JAN-JUL 20400.0 97 22400.0 107 18400.0 88 20960. 20790 5112 75 FEB-SEP 25800.0 98 27800.0 105 23800.0 90 26460. 24050 5112 75 APR-SEP 24900.0 99 26900.0 107 22900.0 91 25110. 22920 5112 75 BIRCHBANK, BC (1) JAN-JUL 37300.0 96 41700.0 107 32800.0 84 38930. 41180 9638 76 APR-SEP 42400.0 97 46900.0 108 38000.0 87 43500. 42860 9638 76 GRAND COULEE, WA (1) JAN-JUL 59900.0 95 66700.0 106 53200.0 85 62900. 66890 16500 67 APR-SEP 63700.0 100 70400.0 110 56900.0 89 63990. 63870 16500 67 ROCK ISLAND DAM BLO, WA (1) JAN-JUL 66100.0 96 73900.0 107 58300.0 85 68910. 71930 17270 64 APR-SEP 70000.0 101 77800.0 112 62200.0 89 69540. 68910 17270 64 THE DALLES NR, OR (1) JAN-JUL 98200.0 92 109000.0 102 87300.0 81 107300. 114700 34990 65 APR-AUG 91900.0 99 103000.0 111 81000.0 87 93090. 97540 34990 65 APR-SEP 97400.0 99 108000.0 109 86500.0 88 98650. 101700 34990 65 KOOTENAI RIVER LIBBY RES INFLOW, MT (1) JAN-JUL 5940.0 94 7140.0 113 4740.0 75 6306. 6909 1377 66 APR-AUG 6050.0 97 7250.0 116 4850.0 78 6248. 6628 1377 66 APR-SEP 6420.0 97 7620.0 115 5220.0 79 6638. 6922 1377 66 LEONIA, ID (1) APR-JUL 7070.0 100 8550.0 121 5590.0 79 7041. 7768 1918 63 APR-SEP 8160.0 100 9640.0 119 6680.0 82 8125. 8545 1918 63 BONNERS FERRY, ID APR-JUL 7730.0 101 9230.0 121 6280.0 82 7619. 8380 2073 62 KOOTENAY RIVER KOOTENAY LAKE INFLOW, BC JAN-JUL 15000.0 94 17100.0 107 12900.0 81 16010. 17210 3598 65 APR-SEP 15900.0 97 18400.0 112 13500.0 82 16450. 16790 3598 65 DUNCAN RIVER DUNCAN RESERVOIR INFLOW, BC JAN-JUL 1780.0 99 2140.0 119 1420.0 79 1800. 2033 402 82 FEB-SEP 2280.0 99 2640.0 115 1920.0 83 2305. 2361 402 82 APR-SEP 2220.0 100 2580.0 116 1860.0 84 2227. 2291 402 82 CLARK FORK BLACKFOOT RIVER ABV, MT APR-SEP 700.0 99 920.0 131 480.0 68 704. 504 320 73 MISSOULA ABV, MT APR-SEP 1540.0 97 1920.0 120 1150.0 72 1595. 1344 549 68 MISSOULA BLO, MT APR-SEP 3040.0 103 3650.0 123 2440.0 82 2962. 2770 941 70 ST. REGIS, MT (1) APR-SEP 4100.0 105 5000.0 128 3200.0 82 3907. 3648 1281 69 PLAINS NR, MT (1) APR-SEP 11200.0 101 13100.0 118 9320.0 84 11060. 10840 2651 58 WHITEHORSE RAPIDS, ID (1) APR-SEP 12700.0 102 15000.0 120 10400.0 83 12460. 12060 2868 52 BLACKFOOT RIVER BONNER NR, MT APR-SEP 830.0 93 1080.0 121 585.0 66 892. 840 229 62 BITTERROOT RIVER AT MOUTH, MT APR-SEP 1500.0 110 1760.0 129 1240.0 91 1364. 1319 398 73 May-08 EarlyBird ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % N.F. FLATHEAD RIVE COLUMBIA FALLS NR, MT APR-SEP 1890.0 105 2200.0 122 1570.0 87 1801. 1780 310 55 M.F. FLATHEAD RIVE WEST GLACIER NR, MT APR-SEP 1760.0 101 2030.0 117 1500.0 86 1740. 1737 305 56 S.F. FLATHEAD RIVE HUNGRY HORSE RES IN, MT (1) JAN-JUL 2090.0 94 2520.0 113 1660.0 75 2224. 2357 435 58 APR-SEP 2070.0 97 2500.0 118 1640.0 77 2124. 2175 435 58 UPPER/MIDDLE COLUMBIA BASINS May-08 EarlyBird ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % FLATHEAD RIVER COLUMBIA FALLS, MT APR-SEP 5840.0 100 6880.0 118 4800.0 82 5825. 6002 1037 53 FLATHEAD LAKE INFLOW, MT (1) APR-SEP 6720.0 100 8010.0 119 5430.0 81 6713. 7002 1458 60 PRIEST RIVER PRIEST RIVER, ID (1) APR-JUL 870.0 107 1070.0 131 670.0 82 814. 997 337 61 PEND OREILLE RIVER PEND OREILLE LAKE IN, ID (1) APR-SEP 14200.0 102 16700.0 120 11700.0 84 13910. 14260 4137 62 APR-JUL 13000.0 102 15500.0 122 10500.0 82 12740. 13520 4137 62 BOX CANYON BLO, WA (1) APR-SEP 14600.0 104 17200.0 122 12000.0 85 14090. 14500 4244 61 KETTLE RIVER LAURIER NR, WA APR-SEP 1780.0 90 2130.0 108 1430.0 73 1972. 2366 212 35 COEUR D'ALENE RIVE ENAVILLE, ID (1) APR-SEP 920.0 118 1080.0 139 760.0 98 778. 871 429 49 APR-JUL 875.0 118 1040.0 141 710.0 96 739. 841 429 49 COEUR D'ALENE LAKE IN, ID APR-JUL 3030.0 119 3560.0 139 2500.0 98 2552. 2456 1626 58 SPOKANE RIVER SPOKANE, WA (1) APR-SEP 3380.0 123 3460.0 126 3310.0 121 2744. 2705 1645 57 ST JOE RIVER CALDER, ID APR-SEP 1470.0 122 1660.0 138 1290.0 107 1205. 1263 358 44 APR-JUL 1390.0 122 1580.0 139 1200.0 106 1136. 1203 358 44 OKANAGAN RIVER TONASKET NR, WA (1) APR-SEP 1490.0 84 2000.0 113 970.0 55 1766. 1470 429 65 SIMILKAMEEN RIVER NIGHTHAWK NR, WA (1) APR-JUL 1130.0 84 1460.0 108 790.0 59 1350. 1079 281 71 APR-SEP 1210.0 83 1540.0 106 875.0 60 1450. 1122 281 71 METHOW RIVER PATEROS NR, WA (1) APR-SEP 820.0 83 1050.0 107 590.0 60 985. 1144 206 73 CHELAN RIVER LAKE CHELAN INFLOW, WA (1) APR-SEP 1100.0 93 1240.0 105 955.0 81 1185. 1345 319 69 WENATCHEE RIVER PESHASTIN, WA APR-SEP 1680.0 103 2190.0 134 1160.0 71 1635. 1669 500 58 YAKIMA AND MAINSTEM SNAKE BASINS May-08 EarlyBird ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % YAKIMA RIVER KEECHELUS LAKE IN, WA (1) APR-SEP 164.0 123 191.0 144 137.0 103 133. 137 89 59 CLE ELUM, WA APR-SEP 1080.0 120 1190.0 132 965.0 107 903. 906 458 56 PARKER NR, WA APR-SEP 2240.0 117 2470.0 129 2020.0 105 1918. 2346 1175 61 KACHESS RIVER KACHESS LAKE INFLOW, WA (1) APR-SEP 148.0 123 166.0 138 131.0 109 120. 122 79 61 CLE ELUM RIVER CLE ELUM LAKE INFLOW, WA (1) APR-SEP 545.0 122 595.0 133 495.0 110 448. 475 191 61 NACHES RIVER NACHES NR, WA APR-SEP 885.0 106 1000.0 119 770.0 92 837. 1086 435 69 BUMPING RIVER BUMPING LAKE INFLOW, WA (1) APR-SEP 145.0 108 168.0 125 122.0 91 134. 154 66 69 TIETON RIVER RIMROCK LAKE INFLOW, WA (1) APR-SEP 255.0 105 290.0 120 220.0 91 242. 244 121 67 AHTANUM CREEKS TAMPICO NR, WA APR-SEP 47.0 102 63.0 137 31.0 67 46. 0 SNAKE RIVER JACKSON LAKE INFLOW, WY (1) APR-JUL 840.0 103 970.0 119 715.0 88 815. 812 242 90 APR-SEP 930.0 103 1060.0 117 805.0 89 904. 861 242 90 PALISADES RES INFLOW, ID (1) APR-JUL 3290.0 99 3750.0 113 2830.0 85 3331. 3267 1088 75 APR-SEP 3830.0 99 4290.0 111 3370.0 87 3875. 3672 1088 75 HEISE NR, ID APR-JUL 3510.0 99 4010.0 113 3010.0 85 3561. 3618 1232 74 APR-SEP 4100.0 99 4600.0 111 3590.0 86 4159. 4188 1232 74 SHELLEY NR, ID (1) APR-JUL 4600.0 104 5250.0 119 3960.0 89 4428. 4634 1917 81 APR-SEP 5530.0 104 6180.0 116 4890.0 92 5324. 5339 1917 81 BLACKFOOT NR, ID (1) APR-JUL 4630.0 101 5290.0 115 3970.0 86 4604. 0 AMER. FALLS RES IN, ID (1) APR-JUL 3180.0 98 4130.0 127 2240.0 69 3242. 2929 2281 71 MILNER, ID APR-JUL 215.0 18 635.0 52 130.0 11 1228. 996 188 9 KING HILL, ID (1) APR-JUL 1860.0 61 2740.0 90 970.0 32 3045. 3030 2982 57 MURPHY NR, ID (1) APR-JUL 1980.0 64 2910.0 94 1040.0 34 3092. 3104 3014 55 WEISER, ID (1) JAN-JUL 6400.0 65 7970.0 81 4830.0 49 9793. 12140 4813 55 APR-JUL 4360.0 76 5930.0 103 2790.0 48 5765. 8160 4813 55 APR-SEP 5780.0 80 7350.0 102 4220.0 59 7192. 9471 4813 55 BROWNLEE RES INFLOW APR-JUL 4950.0 78 6850.0 109 3050.0 48 6313. 8975 5267 56 APR-SEP 6240.0 80 8140.0 104 4340.0 56 7801. 10350 5267 56 HELLS CANYON, ID (1) APR-JUL 5090.0 78 6830.0 105 3350.0 52 6493. 9324 5466 58 APR-SEP 6540.0 82 8280.0 104 4800.0 60 7977. 10740 5466 58 LOWER GRANITE RES IN, WA (1) JAN-JUL 26900.0 90 31000.0 103 22700.0 76 30020. 32200 11370 61 FEB-SEP 28000.0 92 32200.0 106 23900.0 79 30370. 31790 11370 61 APR-JUL 22200.0 103 26300.0 122 18000.0 84 21550. 24440 11370 61 APR-SEP 24500.0 101 28700.0 119 20400.0 85 24140. 26590 11370 61 UPPER SNAKE BASINS May-08 EarlyBird ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % GREY'S RIVER PALISADES ABV, WY APR-SEP 390.0 99 445.0 113 340.0 86 394. 401 142 107 SALT RIVER ETNA NR, WY APR-JUL 340.0 99 420.0 123 260.0 76 342. 363 174 70 HENRYS FORK ASHTON NR, ID APR-JUL 565.0 99 680.0 119 445.0 78 571. 659 481 76 ST. ANTHONY, ID APR-JUL 730.0 99 895.0 122 565.0 77 734. 819 557 75 REXBURG NR, ID APR-JUL 1510.0 97 1770.0 114 1250.0 80 1559. 1016 795 66 FALLS RIVER SQUIRREL NR, ID (1) APR-JUL 375.0 97 440.0 114 310.0 80 386. 370 123 56 TETON RIVER ST. ANTHONY NR, ID APR-JUL 400.0 99 480.0 119 320.0 79 403. 464 177 81 BIG LOST RIVER MACKAY RESERVOIR INFLOW, ID APR-JUL 135.0 95 168.0 118 101.0 71 142. 229 61 71 WILLOW CREEK RIRIE RESERVOIR INFLOW APR-JUL 81.0 94 110.0 128 52.0 60 86. 94 17 35 PORTNEUF RIVER TOPAZ, ID APR-SEP 87.0 92 99.0 104 75.0 79 95. 120 49 62 GOOSE CREEK OAKLEY RES INFLOW, ID APR-JUL 25.0 86 35.0 121 14.5 50 29. 0 BIG WOOD RIVER HAILEY, ID (1) APR-JUL 235.0 92 315.0 123 158.0 62 256. 431 66 66 MAGIC RESERVOIR INFLOW, ID APR-JUL 260.0 89 360.0 124 161.0 55 291. 591 62 37 LITTLE WOOD RIVER CAREY NR, ID APR-JUL 80.0 92 105.0 121 55.0 63 87. 163 29 54 MIDDLE SNAKE BASINS May-08 EarlyBird ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % BRUNEAU RIVER HOT SPRING NR, ID APR-JUL 199.0 96 280.0 135 120.0 58 208. 276 63 52 OWYHEE RIVER OWYHEE RES INFLOW, OR MAR-JUL 475.0 77 625.0 102 325.0 53 613. 1050 377 63 OWYHEE RES OUTFLOW APR-JUL 95.0 44 245.0 113 29.0 13 217. 594 26 9 BOISE RIVER TWIN SPRINGS NR, ID (1) APR-JUL 635.0 100 740.0 116 525.0 83 636. 828 279 82 BOISE NR, ID (1) APR-JUL 1380.0 98 1620.0 115 1140.0 81 1414. 2060 596 68 PARMA NR, ID APR-JUL 285.0 48 500.0 84 117.0 20 593. 1102 327 42 S.F. BOISE RIVER ANDERSON RNCH RES IN, ID (1) APR-JUL 520.0 96 620.0 114 415.0 77 542. 816 171 65 MALHEUR RIVER DREWSEY NR, OR MAR-JUL 111.0 101 121.0 110 101.0 92 110. 239 60 51 N.F. MALHEUR RIVER BEULAH RES INFLOW, OR (1) MAR-JUL 88.0 109 95.0 117 80.0 99 81. 155 46 64 PAYETTE RIVER HORSESHOE BEND NR, ID (1) APR-JUL 1670.0 103 1990.0 123 1340.0 83 1617. 2214 721 73 EMMETT NR, ID APR-JUL 1350.0 108 1690.0 136 990.0 79 1246. 1977 722 69 DEADWOOD RIVER DEADWOOD RES INFLOW, ID (1) APR-JUL 137.0 102 161.0 120 113.0 84 134. 180 41 80 N.F. PAYETTE RIVER CASCADE RES INFLOW, ID (1) APR-JUL 520.0 105 625.0 126 415.0 84 495. 684 240 78 WEISER RIVER WEISER NR, ID (1) APR-JUL 425.0 109 565.0 145 285.0 73 391. 717 419 80 BURNT RIVER HEREFORD NR, OR MAR-JUL 52.0 102 61.0 120 43.0 84 51. 81 LOWER SNAKE AND CENTRAL OREGON BASINS May-08 EarlyBird ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % POWDER RIVER SUMPTER NR, OR MAR-JUL 69.0 99 83.0 119 55.0 79 70. 90 IMNAHA RIVER IMNAHA, OR MAR-JUL 320.0 106 380.0 126 265.0 88 301. 394 93 62 SALMON RIVER SALMON, ID (1) APR-JUL 810.0 95 1100.0 128 520.0 61 857. 1078 459 84 WHITEBIRD, ID (1) JAN-JUL 6670.0 98 7800.0 115 5550.0 82 6805. 7274 2109 82 APR-JUL 5900.0 101 7030.0 120 4780.0 82 5851. 6441 2109 82 GRANDE RONDE RIVER LA GRANDE, OR MAR-JUL 245.0 98 285.0 114 210.0 84 249. 238 158 74 APR-JUL 199.0 108 240.0 130 160.0 87 184. 202 158 74 TROY, OR (1) MAR-JUL 1690.0 107 2090.0 132 1290.0 82 1578. 1573 823 65 APR-JUL 1480.0 116 1880.0 148 1080.0 85 1274. 1369 823 65 CLEARWATER RIVER OROFINO, ID (1) APR-JUL 5250.0 113 6390.0 138 4110.0 88 4645. 4316 1444 56 SPALDING, ID (1) JAN-JUL 9780.0 101 11400.0 118 8180.0 84 9683. 9175 2746 55 APR-JUL 8670.0 117 10300.0 139 7070.0 95 7435. 7274 2746 55 APR-SEP 9080.0 116 10700.0 136 7480.0 95 7849. 7550 2746 55 N.F. CLEARWATER RI DWORSHAK RES INFLOW, ID (1) JAN-JUL 3450.0 97 3950.0 111 2950.0 83 3547. 3507 1033 51 APR-JUL 3060.0 116 3560.0 135 2570.0 97 2644. 2676 1033 51 APR-SEP 3240.0 116 3740.0 133 2740.0 98 2803. 2786 1033 51 S.F. WALLA WALLA R MILTON NR, OR APR-JUL 59.0 111 69.0 130 48.0 91 53. 63 70 90 UMATILLA RIVER GIBBON NR, OR APR-JUL 82.0 112 100.0 137 64.0 88 73. 86 97 79 PENDLETON, OR APR-JUL 170.0 114 210.0 141 132.0 89 149. 178 244 82 M.F. JOHN DAY RIVE RITTER, OR (1) MAR-JUL 180.0 113 205.0 128 155.0 97 160. 0 APR-JUL 139.0 113 165.0 134 114.0 93 123. 0 N.F. JOHN DAY RIVE MONUMENT NR, OR APR-JUL 665.0 111 810.0 136 520.0 87 597. 745 495 74 JOHN DAY RIVER SERVICE CREEK, OR (1) MAR-SEP 1160.0 101 1460.0 127 855.0 74 1153. 1235 681 66 APR-SEP 945.0 109 1250.0 145 645.0 75 865. 1038 681 66 DESCHUTES RIVER BENHAM FALLS, OR APR-SEP 510.0 97 540.0 102 480.0 91 528. 497 523 92 May-08 EarlyBird ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % CROOKED RIVER PRINEVILLE RES INFLOW, OR MAR-JUL 151.0 82 184.0 100 119.0 65 184. 316 125 55 OCHOCO CREEK OCHOCO RES INFLOW, OR MAR-JUL 37.0 103 49.0 136 25.0 69 36. 59 WESTSIDE AND SOUTHERN OREGON BASINS May-08 EarlyBird ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % SKAGIT RIVER CONCRETE NR, WA APR-SEP 6440.0 101 7570.0 119 5300.0 83 6365. 5621 4465 81 COWLITZ RIVER MAYFIELD RES INFLOW, WA JAN-JUL 3200.0 99 4010.0 125 2390.0 74 3217. 3453 2404 76 APR-JUL 2010.0 119 2820.0 167 1210.0 72 1689. 1642 2404 76 APR-SEP 2290.0 119 3100.0 161 1480.0 77 1922. 1817 2404 76 CASTLE ROCK, WA APR-SEP 3030.0 115 4140.0 157 1920.0 73 2639. 2380 4060 82 JAN-JUL 4670.0 99 5780.0 123 3560.0 76 4709. 5136 4060 82 LEWIS RIVER ARIEL, WA JAN-JUL 2290.0 97 2450.0 104 2120.0 90 2351. 2514 2107 77 MCKENZIE RIVER VIDA NR, OR APR-SEP 1380.0 115 1530.0 127 1220.0 102 1201. 1142 2074 97 S. SANTIAM RIVER WATERLOO, OR APR-SEP 700.0 119 870.0 148 525.0 89 587. 540 1798 96 N. SANTIAM RIVER MEHAMA, OR APR-SEP 995.0 119 1200.0 144 790.0 95 834. 754 1858 95 WILLAMETTE RIVER SALEM, OR APR-SEP 5510.0 115 6540.0 136 4490.0 93 4804. 4373 13500 94 CLACKAMAS RIVER ESTACADA, OR APR-SEP 975.0 130 1080.0 144 865.0 116 748. 678 1351 87 N. UMPQUA RIVER LEMOLO LAKE INFLOW, OR (1) APR-SEP 171.0 113 192.0 127 150.0 99 151. 156 129 80 JAN-JUL 188.0 104 210.0 116 167.0 92 181. 195 129 80 ROGUE RIVER RAYGOLD, OR APR-SEP 980.0 110 1080.0 121 885.0 100 889. 895 1431 89 JAN-JUL 1610.0 102 1700.0 107 1510.0 95 1584. 1970 1431 89 CHEWAUCAN RIVER PAISLEY NR, OR MAR-JUL 66.0 74 89.0 100 44.0 49 89. 16 SILVIES RIVER BURNS NR, OR MAR-JUL 129.0 100 175.0 136 83.0 64 129. 196 APR-SEP 131.0 132 177.0 179 85.0 86 99. 167 Forecasts are selected from those prepared by: National Weather Service Natural Resource Conservation Service B.C. Hydro and Power Authority. Project inflow forecasts have been coordinated with the U.S. Army Corp of Engineers and U.S. Bureau of Reclamation. All forecasts are in thousands of acre-feet. All averages are for the period 1971 through 2000 NOAA/NWS/Northwest River Forecast Center NNNN $$
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