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Water Supply Forecasts Northwest River Forecast Center Thursday April 23, 2009 at 15:13 GMT Observed precipitation through the 20th Future precip assumed to be normal No snow included Observed runoff through March note: current month runoff based on OBSERVED + ESP to the end of APR UPPER COLUMBIA BASINS Apr-09 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % COLUMBIA RIVER MICA RESERVOIR INFLOW, BC JAN-JUL 8880.0 92 10200.0 106 7590.0 79 9619. 9199 2301 90 FEB-JUL 8640.0 92 9940.0 106 7350.0 78 9372. 8909 2301 90 APR-SEP 11600.0 93 12900.0 103 10300.0 82 12500. 11570 2301 90 REVELSTOKE, BC JAN-JUL 12800.0 92 13900.0 100 11700.0 84 13880. 13420 3543 94 ARROW LAKES INFLOW JAN-JUL 19100.0 91 21100.0 101 17100.0 82 20960. 19230 5760 85 FEB-JUL 18500.0 91 20500.0 101 16500.0 82 20230. 18670 5760 85 APR-SEP 23200.0 92 25200.0 100 21200.0 84 25110. 22910 5760 85 BIRCHBANK, BC (1) JAN-JUL 34400.0 88 38900.0 100 30000.0 77 38930. 36130 10550 84 APR-SEP 38900.0 89 43400.0 100 34500.0 79 43500. 40800 10550 84 GRAND COULEE, WA (1) JAN-JUL 55500.0 88 62200.0 99 48700.0 77 62900. 59650 20180 82 APR-SEP 57800.0 90 64500.0 101 51000.0 80 63990. 62860 20180 82 ROCK ISLAND DAM BLO, WA (1) JAN-JUL 60500.0 88 68300.0 99 52700.0 76 68910. 64110 21870 81 APR-SEP 62400.0 90 70200.0 101 54600.0 79 69540. 67150 21870 81 THE DALLES NR, OR (1) JAN-JUL 91100.0 85 102000.0 95 80200.0 75 107300. 99210 44100 82 APR-AUG 81400.0 87 92300.0 99 70500.0 76 93090. 93200 44100 82 APR-SEP 86300.0 87 97200.0 99 75400.0 76 98650. 97910 44100 82 KOOTENAI RIVER LIBBY RES INFLOW, MT (1) JAN-JUL 5370.0 85 6570.0 104 4170.0 66 6306. 5516 1452 70 APR-AUG 5440.0 87 6640.0 106 4240.0 68 6248. 5539 1452 70 APR-SEP 5770.0 87 6970.0 105 4570.0 69 6638. 5887 1452 70 LEONIA, ID (1) APR-JUL 6120.0 87 7600.0 108 4640.0 66 7041. 6568 2001 66 APR-SEP 7060.0 87 8540.0 105 5580.0 69 8125. 7516 2001 66 BONNERS FERRY, ID APR-JUL 6610.0 87 8060.0 106 5160.0 68 7619. 7099 2156 64 KOOTENAY RIVER KOOTENAY LAKE INFLOW, BC JAN-JUL 13300.0 83 15500.0 97 11200.0 70 16010. 14250 3882 70 APR-SEP 14000.0 85 16500.0 100 11600.0 71 16450. 15060 3882 70 DUNCAN RIVER DUNCAN RESERVOIR INFLOW, BC JAN-JUL 1650.0 92 2010.0 112 1290.0 72 1800. 1691 454 93 FEB-JUL 1600.0 92 1960.0 112 1240.0 71 1746. 1638 454 93 APR-SEP 2040.0 92 2400.0 108 1680.0 75 2227. 2111 454 93 CLARK FORK BLACKFOOT RIVER ABV, MT APR-SEP 710.0 101 930.0 132 485.0 69 704. 852 549 125 MISSOULA ABV, MT APR-SEP 1630.0 102 2010.0 126 1240.0 78 1595. 1798 1027 127 MISSOULA BLO, MT APR-SEP 2970.0 100 3570.0 121 2360.0 80 2962. 3420 1576 117 ST. REGIS, MT (1) APR-SEP 3850.0 99 4750.0 122 2950.0 76 3907. 4509 2092 112 PLAINS NR, MT (1) APR-SEP 10000.0 90 11900.0 108 8140.0 74 11060. 12090 4360 95 WHITEHORSE RAPIDS, ID (1) APR-SEP 11400.0 91 13700.0 110 9090.0 73 12460. 13630 4784 87 BLACKFOOT RIVER BONNER NR, MT APR-SEP 915.0 103 1160.0 130 665.0 75 892. 946 478 130 BITTERROOT RIVER AT MOUTH, MT APR-SEP 1330.0 98 1590.0 117 1070.0 78 1364. 1597 595 109 Apr-09 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % N.F. FLATHEAD RIVE COLUMBIA FALLS NR, MT APR-SEP 1430.0 79 1750.0 97 1110.0 62 1801. 1865 428 76 M.F. FLATHEAD RIVE WEST GLACIER NR, MT APR-SEP 1540.0 89 1800.0 103 1280.0 74 1740. 2103 426 78 S.F. FLATHEAD RIVE HUNGRY HORSE RES IN, MT (1) JAN-JUL 2020.0 91 2450.0 110 1590.0 71 2224. 2506 734 98 APR-SEP 1960.0 92 2390.0 113 1530.0 72 2124. 2530 734 98 UPPER/MIDDLE COLUMBIA BASINS Apr-09 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % FLATHEAD RIVER COLUMBIA FALLS, MT APR-SEP 5060.0 87 6100.0 105 4020.0 69 5825. 6676 1615 83 FLATHEAD LAKE INFLOW, MT (1) APR-SEP 5840.0 87 7130.0 106 4550.0 68 6713. 7562 2349 97 PRIEST RIVER PRIEST RIVER, ID (1) APR-JUL 750.0 92 950.0 117 550.0 68 814. 849 347 62 PEND OREILLE RIVER PEND OREILLE LAKE IN, ID (1) APR-SEP 12500.0 90 15000.0 108 9980.0 72 13910. 15810 6073 90 APR-JUL 11400.0 89 13900.0 109 8910.0 70 12740. 14580 6073 90 BOX CANYON BLO, WA (1) APR-SEP 12800.0 91 15300.0 109 10200.0 72 14090. 16110 6243 89 KETTLE RIVER LAURIER NR, WA APR-SEP 1680.0 85 2030.0 103 1330.0 67 1972. 1517 324 54 COEUR D'ALENE RIVE ENAVILLE, ID (1) APR-SEP 795.0 102 955.0 123 635.0 82 778. 1302 649 74 APR-JUL 755.0 102 920.0 124 595.0 81 739. 1258 649 74 COEUR D'ALENE LAKE IN, ID APR-JUL 2490.0 98 3020.0 118 1960.0 77 2552. 3826 2550 90 SPOKANE RIVER SPOKANE, WA (1) APR-SEP 2720.0 99 2790.0 102 2640.0 96 2744. 4128 2574 90 ST JOE RIVER CALDER, ID APR-SEP 1160.0 96 1350.0 112 975.0 81 1205. 1656 745 92 APR-JUL 1090.0 96 1280.0 113 905.0 80 1136. 1571 745 92 OKANAGAN RIVER TONASKET NR, WA (1) APR-SEP 1040.0 59 1560.0 88 525.0 30 1766. 1542 424 64 SIMILKAMEEN RIVER NIGHTHAWK NR, WA (1) APR-JUL 800.0 59 1140.0 84 465.0 34 1350. 1189 297 75 APR-SEP 860.0 59 1200.0 83 525.0 36 1450. 1259 297 75 METHOW RIVER PATEROS NR, WA (1) APR-SEP 620.0 63 850.0 86 390.0 40 985. 926 243 86 CHELAN RIVER LAKE CHELAN INFLOW, WA (1) APR-SEP 860.0 73 1010.0 85 720.0 61 1185. 1157 440 95 WENATCHEE RIVER PESHASTIN, WA APR-SEP 1310.0 80 1820.0 111 795.0 49 1635. 1521 815 95 YAKIMA AND MAINSTEM SNAKE BASINS Apr-09 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % YAKIMA RIVER KEECHELUS LAKE IN, WA (1) APR-SEP 119.0 89 146.0 110 92.0 69 133. 174 129 86 CLE ELUM, WA APR-SEP 780.0 86 890.0 99 665.0 74 903. 1013 841 102 PARKER NR, WA APR-SEP 1770.0 92 1990.0 104 1550.0 81 1918. 2325 1847 96 KACHESS RIVER KACHESS LAKE INFLOW, WA (1) APR-SEP 106.0 88 124.0 103 89.0 74 120. 150 115 89 CLE ELUM RIVER CLE ELUM LAKE INFLOW, WA (1) APR-SEP 405.0 90 455.0 102 360.0 80 448. 479 308 98 NACHES RIVER NACHES NR, WA APR-SEP 725.0 87 840.0 100 610.0 73 837. 991 631 100 BUMPING RIVER BUMPING LAKE INFLOW, WA (1) APR-SEP 121.0 90 144.0 107 98.0 73 134. 155 81 84 TIETON RIVER RIMROCK LAKE INFLOW, WA (1) APR-SEP 225.0 93 255.0 105 189.0 78 242. 247 159 88 AHTANUM CREEKS TAMPICO NR, WA APR-SEP 37.0 80 53.0 115 21.0 46 46. 0 SNAKE RIVER JACKSON LAKE INFLOW, WY (1) APR-JUL 860.0 106 985.0 121 735.0 90 815. 894 243 90 APR-SEP 955.0 106 1080.0 119 825.0 91 904. 970 243 90 PALISADES RES INFLOW, ID (1) APR-JUL 3490.0 105 3950.0 119 3030.0 91 3331. 3352 1415 98 APR-SEP 4060.0 105 4520.0 117 3600.0 93 3875. 3850 1415 98 HEISE NR, ID APR-JUL 3730.0 105 4230.0 119 3230.0 91 3561. 3644 1689 102 APR-SEP 4360.0 105 4860.0 117 3860.0 93 4159. 4282 1689 102 SHELLEY NR, ID (1) APR-JUL 4750.0 107 5390.0 122 4100.0 93 4428. 4541 2456 104 APR-SEP 5710.0 107 6360.0 119 5070.0 95 5324. 5320 2456 104 BLACKFOOT NR, ID (1) APR-JUL 4780.0 104 5440.0 118 4130.0 90 4604. 0 AMER. FALLS RES IN, ID (1) APR-JUL 3240.0 100 4180.0 129 2290.0 71 3242. 2731 2636 83 MILNER, ID APR-JUL 1170.0 95 1920.0 156 410.0 33 1228. 160 790 39 KING HILL, ID (1) APR-JUL 2640.0 87 3520.0 116 1760.0 58 3045. 1765 3406 65 MURPHY NR, ID (1) APR-JUL 2820.0 91 3760.0 122 1890.0 61 3092. 1549 3661 67 WEISER, ID (1) JAN-JUL 6610.0 67 8180.0 84 5040.0 51 9793. 5966 5121 59 APR-JUL 4690.0 81 6250.0 108 3120.0 54 5765. 3926 5121 59 APR-SEP 6120.0 85 7690.0 107 4560.0 63 7192. 5218 5121 59 BROWNLEE RES INFLOW APR-JUL 5100.0 81 7000.0 111 3200.0 51 6313. 4367 5757 61 APR-SEP 6410.0 82 8310.0 107 4510.0 58 7801. 5699 5757 61 HELLS CANYON, ID (1) APR-JUL 5170.0 80 6910.0 106 3430.0 53 6493. 4738 5829 61 APR-SEP 6620.0 83 8360.0 105 4880.0 61 7977. 6060 5829 61 LOWER GRANITE RES IN, WA (1) JAN-JUL 26400.0 88 30600.0 102 22300.0 74 30020. 27520 15100 81 FEB-SEP 26800.0 88 30900.0 102 22600.0 74 30370. 28890 15100 81 APR-JUL 20400.0 95 24500.0 114 16200.0 75 21550. 22830 15100 81 APR-SEP 22700.0 94 26800.0 111 18500.0 77 24140. 25390 15100 81 UPPER SNAKE BASINS Apr-09 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % GREY'S RIVER PALISADES ABV, WY APR-SEP 430.0 109 485.0 123 380.0 96 394. 389 130 98 SALT RIVER ETNA NR, WY APR-JUL 360.0 105 440.0 129 275.0 80 342. 311 247 99 HENRYS FORK ASHTON NR, ID APR-JUL 510.0 89 630.0 110 390.0 68 571. 518 536 85 ST. ANTHONY, ID APR-JUL 640.0 87 805.0 110 485.0 66 734. 703 680 92 REXBURG NR, ID APR-JUL 1370.0 88 1630.0 105 1120.0 72 1559. 905 854 71 FALLS RIVER SQUIRREL NR, ID (1) APR-JUL 350.0 91 415.0 108 285.0 74 386. 308 123 56 TETON RIVER ST. ANTHONY NR, ID APR-JUL 360.0 89 440.0 109 280.0 69 403. 445 217 100 BIG LOST RIVER MACKAY RESERVOIR INFLOW, ID APR-JUL 118.0 83 151.0 106 85.0 60 142. 80 64 74 WILLOW CREEK RIRIE RESERVOIR INFLOW APR-JUL 92.0 107 121.0 141 63.0 73 86. 41 48 100 PORTNEUF RIVER TOPAZ, ID APR-SEP 82.0 86 94.0 99 70.0 74 95. 61 57 72 GOOSE CREEK OAKLEY RES INFLOW, ID APR-JUL 25.0 86 35.0 121 14.0 48 29. 0 BIG WOOD RIVER HAILEY, ID (1) APR-JUL 196.0 77 275.0 107 117.0 46 256. 185 87 87 MAGIC RESERVOIR INFLOW, ID APR-JUL 199.0 68 300.0 103 99.0 34 291. 172 60 36 LITTLE WOOD RIVER CAREY NR, ID APR-JUL 66.0 76 91.0 105 41.0 47 87. 50 36 66 MIDDLE SNAKE BASINS Apr-09 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % BRUNEAU RIVER HOT SPRING NR, ID APR-JUL 215.0 103 295.0 142 138.0 66 208. 155 91 75 OWYHEE RIVER OWYHEE RES INFLOW, OR MAR-JUL 405.0 66 555.0 91 255.0 42 613. 452 362 60 OWYHEE RES OUTFLOW APR-JUL 14.7 7 50.0 23 4.5 2 217. 53 26 9 BOISE RIVER TWIN SPRINGS NR, ID (1) APR-JUL 540.0 85 650.0 102 430.0 68 636. 655 310 91 BOISE NR, ID (1) APR-JUL 1150.0 81 1400.0 99 915.0 65 1414. 1290 696 79 PARMA NR, ID APR-JUL 365.0 62 585.0 99 153.0 26 593. 319 358 46 S.F. BOISE RIVER ANDERSON RNCH RES IN, ID (1) APR-JUL 430.0 79 535.0 99 330.0 61 542. 442 212 80 MALHEUR RIVER DREWSEY NR, OR MAR-JUL 73.0 66 84.0 76 63.0 57 110. 85 58 50 N.F. MALHEUR RIVER BEULAH RES INFLOW, OR (1) MAR-JUL 60.0 74 67.0 83 52.0 64 81. 80 39 54 PAYETTE RIVER HORSESHOE BEND NR, ID (1) APR-JUL 1290.0 80 1620.0 100 970.0 60 1617. 1701 786 80 EMMETT NR, ID APR-JUL 1000.0 80 1360.0 109 655.0 53 1246. 1394 734 70 DEADWOOD RIVER DEADWOOD RES INFLOW, ID (1) APR-JUL 108.0 81 132.0 99 84.0 63 134. 141 35 69 N.F. PAYETTE RIVER CASCADE RES INFLOW, ID (1) APR-JUL 390.0 79 495.0 100 285.0 58 495. 525 251 82 WEISER RIVER WEISER NR, ID (1) APR-JUL 305.0 78 445.0 114 167.0 43 391. 479 278 53 BURNT RIVER HEREFORD NR, OR MAR-JUL 36.0 71 44.0 86 27.0 53 51. 57 39 76 LOWER SNAKE AND CENTRAL OREGON BASINS Apr-09 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % POWDER RIVER SUMPTER NR, OR MAR-JUL 56.0 80 71.0 101 42.0 60 70. 80 IMNAHA RIVER IMNAHA, OR MAR-JUL 250.0 83 305.0 101 193.0 64 301. 337 139 92 SALMON RIVER SALMON, ID (1) APR-JUL 785.0 92 1080.0 126 500.0 58 857. 806 499 92 WHITEBIRD, ID (1) JAN-JUL 6430.0 94 7560.0 111 5310.0 78 6805. 7310 2352 92 APR-JUL 5610.0 96 6740.0 115 4490.0 77 5851. 6560 2352 92 GRANDE RONDE RIVER LA GRANDE, OR MAR-JUL 225.0 90 260.0 104 184.0 74 249. 347 228 107 APR-JUL 175.0 95 215.0 117 136.0 74 184. 301 228 107 TROY, OR (1) MAR-JUL 1480.0 94 1880.0 119 1080.0 68 1578. 1971 1321 105 APR-JUL 1200.0 94 1600.0 126 800.0 63 1274. 1761 1321 105 CLEARWATER RIVER OROFINO, ID (1) APR-JUL 4860.0 105 6000.0 129 3720.0 80 4645. 5729 2751 107 SPALDING, ID (1) JAN-JUL 9780.0 101 11400.0 118 8180.0 84 9683. 10500 4929 99 APR-JUL 7810.0 105 9410.0 127 6210.0 84 7435. 9382 4929 99 APR-SEP 8230.0 105 9830.0 125 6630.0 84 7849. 9851 4929 99 N.F. CLEARWATER RI DWORSHAK RES INFLOW, ID (1) JAN-JUL 3440.0 97 3940.0 111 2940.0 83 3547. 3823 1859 92 APR-JUL 2660.0 101 3160.0 120 2160.0 82 2644. 3434 1859 92 APR-SEP 2820.0 101 3320.0 118 2320.0 83 2803. 3659 1859 92 S.F. WALLA WALLA R MILTON NR, OR APR-JUL 54.0 102 64.0 121 43.0 81 53. 92 101 130 UMATILLA RIVER GIBBON NR, OR APR-JUL 83.0 114 101.0 138 65.0 89 73. 127 138 112 PENDLETON, OR APR-JUL 169.0 113 210.0 141 131.0 88 149. 285 353 119 M.F. JOHN DAY RIVE RITTER, OR (1) MAR-JUL 151.0 94 177.0 111 126.0 79 160. 0 APR-JUL 116.0 94 142.0 115 91.0 74 123. 0 N.F. JOHN DAY RIVE MONUMENT NR, OR APR-JUL 550.0 92 690.0 116 405.0 68 597. 883 548 81 JOHN DAY RIVER SERVICE CREEK, OR (1) MAR-SEP 1060.0 92 1360.0 118 760.0 66 1153. 1362 781 76 APR-SEP 860.0 99 1160.0 134 560.0 65 865. 1152 781 76 DESCHUTES RIVER BENHAM FALLS, OR APR-SEP 500.0 95 530.0 100 470.0 89 528. 504 599 106 Apr-09 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % CROOKED RIVER PRINEVILLE RES INFLOW, OR MAR-JUL 136.0 74 168.0 91 103.0 56 184. 143 105 46 OCHOCO CREEK OCHOCO RES INFLOW, OR MAR-JUL 26.0 72 38.0 106 14.0 39 36. 33 WESTSIDE AND SOUTHERN OREGON BASINS Apr-09 Mid Month ________________Forecast______________ __________Runoff___________ Stream and Station Probable % Maximum % Minimum % Average PrevYr CurYR % SKAGIT RIVER CONCRETE NR, WA APR-SEP 5190.0 82 6320.0 99 4050.0 64 6365. 6790 4433 80 COWLITZ RIVER MAYFIELD RES INFLOW, WA JAN-JUL 3100.0 96 3900.0 121 2290.0 71 3217. 3468 2855 90 APR-JUL 1580.0 94 2390.0 142 775.0 46 1689. 2328 2855 90 APR-SEP 1800.0 94 2600.0 135 990.0 52 1922. 2615 2855 90 CASTLE ROCK, WA APR-SEP 2500.0 95 3610.0 137 1390.0 53 2639. 3330 4226 86 JAN-JUL 4550.0 97 5660.0 120 3440.0 73 4709. 4998 4226 86 LEWIS RIVER ARIEL, WA JAN-JUL 2130.0 91 2290.0 97 1960.0 83 2351. 2397 2049 75 MCKENZIE RIVER VIDA NR, OR APR-SEP 1150.0 96 1310.0 109 995.0 83 1201. 1674 2003 93 S. SANTIAM RIVER WATERLOO, OR APR-SEP 615.0 105 785.0 134 440.0 75 587. 895 1606 86 N. SANTIAM RIVER MEHAMA, OR APR-SEP 850.0 102 1060.0 127 645.0 77 834. 1413 1813 93 WILLAMETTE RIVER SALEM, OR APR-SEP 4810.0 100 5840.0 122 3780.0 79 4804. 6084 10880 76 CLACKAMAS RIVER ESTACADA, OR APR-SEP 800.0 107 905.0 121 690.0 92 748. 1174 1309 84 N. UMPQUA RIVER LEMOLO LAKE INFLOW, OR (1) APR-SEP 144.0 95 165.0 109 122.0 81 151. 164 138 85 JAN-JUL 168.0 93 189.0 104 146.0 81 181. 180 138 85 ROGUE RIVER RAYGOLD, OR APR-SEP 770.0 87 865.0 97 675.0 76 889. 1076 1243 77 JAN-JUL 1320.0 83 1410.0 89 1220.0 77 1584. 1697 1243 77 CHEWAUCAN RIVER PAISLEY NR, OR MAR-JUL 69.0 78 92.0 103 47.0 53 89. 16 SILVIES RIVER BURNS NR, OR MAR-JUL 100.0 78 146.0 113 54.0 42 129. 79 61 57 APR-SEP 84.0 85 130.0 131 38.0 38 99. 82 61 57 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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