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Water Supply Forecasts Northwest River Forecast Center Friday May 16, 2008 at 21:35 GMT Observed precipitation through the 12th Future precip assumed to be 65% of normal to end of month then normal the rest of the period No snow included Observed runoff through April note: current month runoff based on OBSERVED + ESP to the end of MAY UPPER COLUMBIA BASINS May-08 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % COLUMBIA RIVER MICA RESERVOIR INFLOW, BC JAN-JUL 9760.0 101 11000.0 114 8480.0 88 9619. 9985 4022 93 FEB-SEP 13200.0 102 14500.0 112 11900.0 92 12960. 12300 4022 93 APR-SEP 12800.0 102 14000.0 112 11500.0 92 12500. 11850 4022 93 REVELSTOKE, BC JAN-JUL 14000.0 101 15100.0 109 12900.0 93 13880. 14190 6043 92 ARROW LAKES INFLOW JAN-JUL 20500.0 98 22400.0 107 18600.0 89 20960. 20790 9189 81 FEB-SEP 26000.0 98 27900.0 105 24100.0 91 26460. 24050 9189 81 APR-SEP 25100.0 100 27000.0 108 23200.0 92 25110. 22920 9189 81 BIRCHBANK, BC (1) JAN-JUL 37100.0 95 41400.0 106 32900.0 85 38930. 41180 17930 81 APR-SEP 42200.0 97 46500.0 107 38000.0 87 43500. 42860 17930 81 GRAND COULEE, WA (1) JAN-JUL 58700.0 93 64900.0 103 52500.0 83 62900. 66890 32820 80 APR-SEP 62300.0 97 68500.0 107 56100.0 88 63990. 63870 32820 80 ROCK ISLAND DAM BLO, WA (1) JAN-JUL 64800.0 94 72100.0 105 57500.0 83 68910. 71930 34820 77 APR-SEP 68500.0 99 75800.0 109 61200.0 88 69540. 68910 34820 77 THE DALLES NR, OR (1) JAN-JUL 94700.0 88 104000.0 97 85100.0 79 107300. 114700 61400 76 APR-AUG 88100.0 95 97600.0 105 78500.0 84 93090. 97540 61400 76 APR-SEP 93400.0 95 103000.0 104 83800.0 85 98650. 101700 61400 76 KOOTENAI RIVER LIBBY RES INFLOW, MT (1) JAN-JUL 5670.0 90 6790.0 108 4540.0 72 6306. 6909 2758 73 APR-AUG 5750.0 92 6880.0 110 4630.0 74 6248. 6628 2758 73 APR-SEP 6100.0 92 7230.0 109 4980.0 75 6638. 6922 2758 73 LEONIA, ID (1) APR-JUL 6660.0 95 8050.0 114 5270.0 75 7041. 7768 3997 76 APR-SEP 7680.0 95 9070.0 112 6290.0 77 8125. 8545 3997 76 BONNERS FERRY, ID APR-JUL 7290.0 96 8700.0 114 5930.0 78 7619. 8380 4544 78 KOOTENAY RIVER KOOTENAY LAKE INFLOW, BC JAN-JUL 14600.0 91 16500.0 103 12700.0 79 16010. 17210 7473 75 APR-SEP 15500.0 94 17700.0 108 13300.0 81 16450. 16790 7473 75 DUNCAN RIVER DUNCAN RESERVOIR INFLOW, BC JAN-JUL 1720.0 96 2080.0 116 1370.0 76 1800. 2033 763 87 FEB-SEP 2210.0 96 2560.0 111 1850.0 80 2305. 2361 763 87 APR-SEP 2150.0 97 2510.0 113 1800.0 81 2227. 2291 763 87 CLARK FORK BLACKFOOT RIVER ABV, MT APR-SEP 695.0 99 915.0 130 475.0 67 704. 504 533 84 MISSOULA ABV, MT APR-SEP 1500.0 94 1750.0 110 1250.0 78 1595. 1344 1094 84 MISSOULA BLO, MT APR-SEP 2840.0 96 3210.0 108 2470.0 83 2962. 2770 1960 87 ST. REGIS, MT (1) APR-SEP 3810.0 98 4550.0 116 3070.0 79 3907. 3648 2622 85 PLAINS NR, MT (1) APR-SEP 10700.0 97 12400.0 112 9070.0 82 11060. 10840 6582 81 WHITEHORSE RAPIDS, ID (1) APR-SEP 12300.0 99 14200.0 114 10400.0 83 12460. 12060 7292 77 BLACKFOOT RIVER BONNER NR, MT APR-SEP 785.0 88 875.0 98 700.0 78 892. 840 562 85 BITTERROOT RIVER AT MOUTH, MT APR-SEP 1340.0 98 1510.0 111 1160.0 85 1364. 1319 880 93 May-08 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % N.F. FLATHEAD RIVE COLUMBIA FALLS NR, MT APR-SEP 1770.0 98 1950.0 108 1580.0 88 1801. 1780 954 82 M.F. FLATHEAD RIVE WEST GLACIER NR, MT APR-SEP 1760.0 101 1960.0 113 1570.0 90 1740. 1737 1070 96 S.F. FLATHEAD RIVE HUNGRY HORSE RES IN, MT (1) JAN-JUL 2020.0 91 2440.0 110 1610.0 72 2224. 2357 1313 88 APR-SEP 2000.0 94 2420.0 114 1580.0 74 2124. 2175 1313 88 UPPER/MIDDLE COLUMBIA BASINS May-08 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % FLATHEAD RIVER COLUMBIA FALLS, MT APR-SEP 5660.0 97 6390.0 110 4930.0 85 5825. 6002 3347 86 FLATHEAD LAKE INFLOW, MT (1) APR-SEP 6570.0 98 7740.0 115 5390.0 80 6713. 7002 4068 88 PRIEST RIVER PRIEST RIVER, ID (1) APR-JUL 830.0 102 1020.0 125 640.0 79 814. 997 631 72 PEND OREILLE RIVER PEND OREILLE LAKE IN, ID (1) APR-SEP 13500.0 97 15600.0 112 11500.0 83 13910. 14260 9236 82 APR-JUL 12400.0 97 14400.0 113 10300.0 81 12740. 13520 9236 82 BOX CANYON BLO, WA (1) APR-SEP 13700.0 97 15900.0 113 11600.0 82 14090. 14500 9363 81 KETTLE RIVER LAURIER NR, WA APR-SEP 1740.0 88 2000.0 101 1480.0 75 1972. 2366 937 69 COEUR D'ALENE RIVE ENAVILLE, ID (1) APR-SEP 910.0 117 1010.0 130 815.0 105 778. 871 1077 93 APR-JUL 865.0 117 960.0 130 770.0 104 739. 841 1077 93 COEUR D'ALENE LAKE IN, ID APR-JUL 2930.0 115 3210.0 126 2660.0 104 2552. 2456 3361 88 SPOKANE RIVER SPOKANE, WA (1) APR-SEP 3380.0 123 3450.0 126 3310.0 121 2744. 2705 3235 84 ST JOE RIVER CALDER, ID APR-SEP 1330.0 110 1450.0 120 1220.0 101 1205. 1263 909 72 APR-JUL 1260.0 111 1380.0 121 1150.0 101 1136. 1203 909 72 OKANAGAN RIVER TONASKET NR, WA (1) APR-SEP 1510.0 86 1980.0 112 1040.0 59 1766. 1470 851 71 SIMILKAMEEN RIVER NIGHTHAWK NR, WA (1) APR-JUL 1120.0 83 1430.0 106 800.0 59 1350. 1079 675 76 APR-SEP 1200.0 83 1520.0 105 885.0 61 1450. 1122 675 76 METHOW RIVER PATEROS NR, WA (1) APR-SEP 815.0 83 1020.0 104 605.0 61 985. 1144 492 82 CHELAN RIVER LAKE CHELAN INFLOW, WA (1) APR-SEP 1100.0 93 1310.0 111 890.0 75 1185. 1345 588 75 WENATCHEE RIVER PESHASTIN, WA APR-SEP 1640.0 100 2140.0 131 1130.0 69 1635. 1669 895 67 YAKIMA AND MAINSTEM SNAKE BASINS May-08 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % YAKIMA RIVER KEECHELUS LAKE IN, WA (1) APR-SEP 155.0 117 178.0 134 131.0 98 133. 137 144 74 CLE ELUM, WA APR-SEP 1010.0 112 1140.0 126 885.0 98 903. 906 837 75 PARKER NR, WA APR-SEP 2100.0 109 2400.0 125 1790.0 93 1918. 2346 2006 79 KACHESS RIVER KACHESS LAKE INFLOW, WA (1) APR-SEP 138.0 115 156.0 130 120.0 100 120. 122 134 79 CLE ELUM RIVER CLE ELUM LAKE INFLOW, WA (1) APR-SEP 520.0 116 580.0 129 455.0 102 448. 475 371 82 NACHES RIVER NACHES NR, WA APR-SEP 865.0 103 990.0 118 740.0 88 837. 1086 760 84 BUMPING RIVER BUMPING LAKE INFLOW, WA (1) APR-SEP 137.0 102 165.0 123 109.0 81 134. 154 107 78 TIETON RIVER RIMROCK LAKE INFLOW, WA (1) APR-SEP 250.0 103 280.0 116 220.0 91 242. 244 176 72 AHTANUM CREEKS TAMPICO NR, WA APR-SEP 47.0 102 62.0 135 32.0 70 46. 0 SNAKE RIVER JACKSON LAKE INFLOW, WY (1) APR-JUL 855.0 105 1010.0 124 700.0 86 815. 812 482 90 APR-SEP 950.0 105 1100.0 122 795.0 88 904. 861 482 90 PALISADES RES INFLOW, ID (1) APR-JUL 3210.0 96 3640.0 109 2770.0 83 3331. 3267 1949 79 APR-SEP 3730.0 96 4170.0 108 3290.0 85 3875. 3672 1949 79 HEISE NR, ID APR-JUL 3420.0 96 3900.0 110 2930.0 82 3561. 3618 2147 77 APR-SEP 4000.0 96 4480.0 108 3510.0 84 4159. 4188 2147 77 SHELLEY NR, ID (1) APR-JUL 4510.0 102 5060.0 114 3960.0 89 4428. 4634 3093 82 APR-SEP 5420.0 102 5970.0 112 4870.0 91 5324. 5339 3093 82 BLACKFOOT NR, ID (1) APR-JUL 4540.0 99 5130.0 111 3950.0 86 4604. 0 AMER. FALLS RES IN, ID (1) APR-JUL 3090.0 95 3900.0 120 2280.0 70 3242. 2929 3026 69 MILNER, ID APR-JUL 255.0 21 855.0 70 176.0 14 1228. 996 203 8 KING HILL, ID (1) APR-JUL 1870.0 61 2670.0 88 1060.0 35 3045. 3030 3417 56 MURPHY NR, ID (1) APR-JUL 1950.0 63 2830.0 92 1080.0 35 3092. 3104 3436 54 WEISER, ID (1) JAN-JUL 6020.0 61 7440.0 76 4600.0 47 9793. 12140 5979 57 APR-JUL 3980.0 69 5400.0 94 2560.0 44 5765. 8160 5979 57 APR-SEP 5390.0 75 6810.0 95 3980.0 55 7192. 9471 5979 57 BROWNLEE RES INFLOW APR-JUL 4520.0 72 6240.0 99 2800.0 44 6313. 8975 6577 58 APR-SEP 5660.0 73 7380.0 95 3940.0 51 7801. 10350 6577 58 HELLS CANYON, ID (1) APR-JUL 4680.0 72 6250.0 96 3100.0 48 6493. 9324 6879 60 APR-SEP 6120.0 77 7690.0 96 4540.0 57 7977. 10740 6879 60 LOWER GRANITE RES IN, WA (1) JAN-JUL 25400.0 85 28900.0 96 21900.0 73 30020. 32200 19220 74 FEB-SEP 26400.0 87 29900.0 98 22900.0 75 30370. 31790 19220 74 APR-JUL 20700.0 96 24300.0 113 17200.0 80 21550. 24440 19220 74 APR-SEP 22900.0 95 26400.0 109 19400.0 80 24140. 26590 19220 74 UPPER SNAKE BASINS May-08 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % GREY'S RIVER PALISADES ABV, WY APR-SEP 365.0 93 415.0 105 320.0 81 394. 401 249 103 SALT RIVER ETNA NR, WY APR-JUL 320.0 94 380.0 111 260.0 76 342. 363 277 75 HENRYS FORK ASHTON NR, ID APR-JUL 550.0 96 620.0 109 480.0 84 571. 659 581 70 ST. ANTHONY, ID APR-JUL 730.0 99 845.0 115 615.0 84 734. 819 796 78 REXBURG NR, ID APR-JUL 1510.0 97 1690.0 108 1330.0 85 1559. 1016 1124 66 FALLS RIVER SQUIRREL NR, ID (1) APR-JUL 355.0 92 410.0 106 300.0 78 386. 370 207 59 TETON RIVER ST. ANTHONY NR, ID APR-JUL 435.0 108 510.0 127 360.0 89 403. 464 273 82 BIG LOST RIVER MACKAY RESERVOIR INFLOW, ID APR-JUL 122.0 86 162.0 114 81.0 57 142. 229 82 69 WILLOW CREEK RIRIE RESERVOIR INFLOW APR-JUL 71.0 83 97.0 113 44.0 51 86. 94 48 53 PORTNEUF RIVER TOPAZ, ID APR-SEP 91.0 96 103.0 108 79.0 83 95. 120 71 67 GOOSE CREEK OAKLEY RES INFLOW, ID APR-JUL 26.0 90 31.0 107 20.0 69 29. 0 BIG WOOD RIVER HAILEY, ID (1) APR-JUL 220.0 86 300.0 117 146.0 57 256. 431 134 74 MAGIC RESERVOIR INFLOW, ID APR-JUL 230.0 79 285.0 98 181.0 62 291. 591 118 46 LITTLE WOOD RIVER CAREY NR, ID APR-JUL 70.0 80 87.0 100 53.0 61 87. 163 49 58 MIDDLE SNAKE BASINS May-08 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % BRUNEAU RIVER HOT SPRING NR, ID APR-JUL 175.0 84 220.0 106 131.0 63 208. 276 132 65 OWYHEE RIVER OWYHEE RES INFLOW, OR MAR-JUL 445.0 73 510.0 83 380.0 62 613. 1050 502 67 OWYHEE RES OUTFLOW APR-JUL 27.0 12 31.0 14 24.0 11 217. 594 40 11 BOISE RIVER TWIN SPRINGS NR, ID (1) APR-JUL 610.0 96 710.0 112 510.0 80 636. 828 506 89 BOISE NR, ID (1) APR-JUL 1280.0 91 1520.0 107 1050.0 74 1414. 2060 1139 81 PARMA NR, ID APR-JUL 240.0 40 455.0 77 112.0 19 593. 1102 398 41 S.F. BOISE RIVER ANDERSON RNCH RES IN, ID (1) APR-JUL 475.0 88 575.0 106 375.0 69 542. 816 358 76 MALHEUR RIVER DREWSEY NR, OR MAR-JUL 76.0 69 81.0 74 71.0 65 110. 239 87 62 N.F. MALHEUR RIVER BEULAH RES INFLOW, OR (1) MAR-JUL 70.0 86 74.0 91 66.0 81 81. 155 72 77 PAYETTE RIVER HORSESHOE BEND NR, ID (1) APR-JUL 1580.0 98 1910.0 118 1260.0 78 1617. 2214 1365 87 EMMETT NR, ID APR-JUL 1260.0 101 1620.0 130 915.0 73 1246. 1977 1297 90 DEADWOOD RIVER DEADWOOD RES INFLOW, ID (1) APR-JUL 129.0 96 153.0 114 105.0 78 134. 180 88 87 N.F. PAYETTE RIVER CASCADE RES INFLOW, ID (1) APR-JUL 495.0 100 595.0 120 395.0 80 495. 684 434 88 WEISER RIVER WEISER NR, ID (1) APR-JUL 440.0 113 565.0 145 315.0 81 391. 717 610 91 BURNT RIVER HEREFORD NR, OR MAR-JUL 51.0 100 55.0 108 48.0 94 51. 81 LOWER SNAKE AND CENTRAL OREGON BASINS May-08 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % POWDER RIVER SUMPTER NR, OR MAR-JUL 62.0 89 72.0 103 53.0 76 70. 90 IMNAHA RIVER IMNAHA, OR MAR-JUL 285.0 95 325.0 108 240.0 80 301. 394 209 85 SALMON RIVER SALMON, ID (1) APR-JUL 825.0 96 1110.0 130 540.0 63 857. 1078 679 88 WHITEBIRD, ID (1) JAN-JUL 6270.0 92 7270.0 107 5270.0 77 6805. 7274 4105 91 APR-JUL 5510.0 94 6500.0 111 4510.0 77 5851. 6441 4105 91 GRANDE RONDE RIVER LA GRANDE, OR MAR-JUL 225.0 90 245.0 98 210.0 84 249. 238 276 97 APR-JUL 179.0 97 198.0 108 160.0 87 184. 202 276 97 TROY, OR (1) MAR-JUL 1600.0 101 1990.0 126 1200.0 76 1578. 1573 1476 87 APR-JUL 1390.0 109 1780.0 140 995.0 78 1274. 1369 1476 87 CLEARWATER RIVER OROFINO, ID (1) APR-JUL 5040.0 109 6090.0 131 3990.0 86 4645. 4316 3854 89 SPALDING, ID (1) JAN-JUL 9220.0 95 10700.0 111 7760.0 80 9683. 9175 6329 81 APR-JUL 8100.0 109 9560.0 129 6640.0 89 7435. 7274 6329 81 APR-SEP 8490.0 108 9950.0 127 7030.0 90 7849. 7550 6329 81 N.F. CLEARWATER RI DWORSHAK RES INFLOW, ID (1) JAN-JUL 3170.0 89 3600.0 101 2740.0 77 3547. 3507 2153 71 APR-JUL 2780.0 105 3210.0 121 2350.0 89 2644. 2676 2153 71 APR-SEP 2950.0 105 3380.0 121 2520.0 90 2803. 2786 2153 71 S.F. WALLA WALLA R MILTON NR, OR APR-JUL 68.0 128 76.0 143 60.0 113 53. 63 108 113 UMATILLA RIVER GIBBON NR, OR APR-JUL 95.0 130 104.0 142 85.0 116 73. 86 149 99 PENDLETON, OR APR-JUL 205.0 138 220.0 148 187.0 126 149. 178 356 101 M.F. JOHN DAY RIVE RITTER, OR (1) MAR-JUL 172.0 108 189.0 118 154.0 96 160. 0 APR-JUL 133.0 108 150.0 122 115.0 93 123. 0 N.F. JOHN DAY RIVE MONUMENT NR, OR APR-JUL 635.0 106 720.0 121 550.0 92 597. 745 913 100 JOHN DAY RIVER SERVICE CREEK, OR (1) MAR-SEP 1140.0 99 1430.0 124 855.0 74 1153. 1235 1189 88 APR-SEP 930.0 108 1220.0 141 645.0 75 865. 1038 1189 88 DESCHUTES RIVER BENHAM FALLS, OR APR-SEP 480.0 91 505.0 96 455.0 86 528. 497 645 98 May-08 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % CROOKED RIVER PRINEVILLE RES INFLOW, OR MAR-JUL 171.0 93 184.0 100 159.0 86 184. 316 194 74 OCHOCO CREEK OCHOCO RES INFLOW, OR MAR-JUL 34.0 94 38.0 106 30.0 83 36. 59 WESTSIDE AND SOUTHERN OREGON BASINS May-08 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % SKAGIT RIVER CONCRETE NR, WA APR-SEP 6500.0 102 7630.0 120 5360.0 84 6365. 5621 6068 86 COWLITZ RIVER MAYFIELD RES INFLOW, WA JAN-JUL 3120.0 97 3910.0 122 2330.0 72 3217. 3453 3163 85 APR-JUL 1940.0 115 2730.0 162 1150.0 68 1689. 1642 3163 85 APR-SEP 2210.0 115 3000.0 156 1420.0 74 1922. 1817 3163 85 CASTLE ROCK, WA APR-SEP 2920.0 111 4000.0 152 1830.0 69 2639. 2380 4993 89 JAN-JUL 4570.0 97 5650.0 120 3480.0 74 4709. 5136 4993 89 LEWIS RIVER ARIEL, WA JAN-JUL 2290.0 97 2400.0 102 2180.0 93 2351. 2514 2598 85 MCKENZIE RIVER VIDA NR, OR APR-SEP 1370.0 114 1450.0 121 1290.0 107 1201. 1142 2547 104 S. SANTIAM RIVER WATERLOO, OR APR-SEP 685.0 117 795.0 135 575.0 98 587. 540 2103 102 N. SANTIAM RIVER MEHAMA, OR APR-SEP 1050.0 126 1180.0 141 920.0 110 834. 754 2313 106 WILLAMETTE RIVER SALEM, OR APR-SEP 5370.0 112 5960.0 124 4780.0 100 4804. 4373 15390 98 CLACKAMAS RIVER ESTACADA, OR APR-SEP 935.0 125 1020.0 136 850.0 114 748. 678 1724 98 N. UMPQUA RIVER LEMOLO LAKE INFLOW, OR (1) APR-SEP 168.0 111 189.0 125 147.0 97 151. 156 177 91 JAN-JUL 188.0 104 210.0 116 167.0 92 181. 195 177 91 ROGUE RIVER RAYGOLD, OR APR-SEP 940.0 106 1000.0 112 880.0 99 889. 895 1734 94 JAN-JUL 1570.0 99 1630.0 103 1510.0 95 1584. 1970 1734 94 CHEWAUCAN RIVER PAISLEY NR, OR MAR-JUL 57.0 64 80.0 90 35.0 39 89. 16 SILVIES RIVER BURNS NR, OR MAR-JUL 81.0 63 126.0 98 35.0 27 129. 196 APR-SEP 82.0 83 128.0 129 37.0 37 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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