February 1, 2018 Spring and Summer Streamflow Forecasts
Missouri River Basin Mountain Snowpack as of February 1, 2018
Upper Missouri Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER MISSOURI BASIN AS OF
FEBRUARY 1 WAS ABOVE AVERAGE. THE SNOW PACK ABOVE FORT PECK,
MONTANA WAS 126 PERCENT. THE SNOW PACK IN THE ST MARY BASIN WAS 103
PERCENT, AND THE MILK RIVER BASIN WAS 84 PERCENT.
JANUARY PRECIPITATION ACROSS THE UPPER MISSOURI BASIN RANGED FROM
BELOW TO ABOVE AVERAGE. BASIN PRECIPITATION SUMMARIES FOR THE
MISSOURI BASIN INCLUDE: MILK ST. MARY, 63 PERCENT; MILK CANADA,
45 PERCENT; LOWER MILK, 63 PERCENT; ABOVE TOSTON, 135 PERCENT;
TOSTON TO FT. PECK, 109 PERCENT.
January 2018 Upper Missouri Mean Precip Oct-Jan WY2018 Upper Missouri Mean Precip
STREAM FLOW IN THE UPPER MISSOURI BASIN IS FORECAST TO BE
NEAR AVERAGE DURING THE UPCOMING SPRING AND SUMMER. THE ST.
MARY RIVER IS FORECAST TO HAVE 85 PERCENT OF AVERAGE APRIL-SEPTEMBER
FLOWS. RUNOFF IS EXPECTED TO RANGE AROUND 120 PERCENT OF AVERAGE
FOR THE MISSOURI BASIN ABOVE FORT PECK, MONTANA.
Upper Missouri February 1, 2018 Spring and Summer Streamflow Forecasts
OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA: LIMA RESERVOIR
HAD 183 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 118 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 32 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 92 PERCENT OF AVERAGE STORED WATER.
THE MAJOR HYDROELECTRIC RESERVOIRS IN MONTANA (CANYON FERRY AND
FORT PECK) HAD MONTHEND STORAGE IN THE AVERAGE TO ABOVE AVERAGE
RANGE; 96 AND 117 PERCENT OF AVERAGE WATER, RESPECTIVELY.
Yellowstone Basin
THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS ABOVE
AVERAGE ON FEBRUARY 1. THE SNOW PACK IN THE UPPER YELLOWSTONE BASIN WAS
148 PERCENT OF AVERAGE. THE SNOW PACKS IN THE WIND, BIGHORN, AND
SHOSHONE BASINS WERE 118, 129, AND 140 PERCENT OF AVERAGE,
RESPECTIVELY. THE SNOW PACKS IN THE TONGUE AND POWDER BASINS WERE
98 AND 114 PERCENT OF AVERAGE, RESPECTIVELY.
PRECIPITATION DURING JANUARY WAS ABOVE AVERAGE. THE UPPER
YELLOWSTONE RIVER BASIN RECEIVED 127 PERCENT OF AVERAGE PRECIPITATION
WHILE THE LOWER YELLOWSTONE BASIN REPORTED 159 PERCENT OF AVERAGE.
THE BIGHORN BASIN RECEIVED 147 PERCENT OF AVERAGE PRECIPITATION
WHILE THE WIND RIVER BASIN RECEIVED 104 PERCENT OF AVERAGE.
THE LITTLE BIGHORN - UPPER TONGUE BASIN RECEIVED 91 PERCENT OF
AVERAGE AND THE POWDER RIVER HAD 147 PERCENT OF AVERAGE PRECIPITATION.
January 2018 Yellowstone Mean Precip Oct-Jan WY2018 Yellowstone Mean Precip
FORECAST STREAM FLOW IN THE YELLOWSTONE BASIN RANGED FROM BELOW
TO ABOVE AVERAGE FOR THE UPCOMING SPRING AND SUMMER. STREAM
FLOW FOR THE BIGHORN RIVER AT ST. XAVIER, MONTANA IS
FORECAST TO BE ABOUT 135 PERCENT OF AVERAGE. FLOW IN THE
TONGUE BASIN IS EXPECTED TO BE 88 PERCENT OF AVERAGE. FLOWS IN THE
POWDER RIVER ARE EXPECTED TO BE ABOUT 80 PERCENT OF AVERAGE.
MONTHEND STORAGE AT BOYSEN RESERVOIR WAS 118 PERCENT OF AVERAGE.
STORED WATER IN BUFFALO BILL RESERVOIR WAS 137 PERCENT OF AVERAGE.
MONTHEND STORAGE WAS 104 PERCENT OF AVERAGE AT BIGHORN RESERVOIR.
Yellowstone February 1, 2018 Spring and Summer Streamflow Forecasts
Platte Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS
87 PERCENT OF AVERAGE ON FEBRUARY 1. THE SNOW PACK IN THE NORTH
PLATTE BASIN BELOW SEMINOE RESERVOIR WAS 79 PERCENT OF AVERAGE.
THE SNOW PACK IN THE SOUTH PLATTE BASIN WAS 80 PERCENT OF AVERAGE.
PRECIPITATION DURING JANUARY IN THE UPPER NORTH PLATTE
BASIN WAS 71 PERCENT OF AVERAGE. IN THE LOWER NORTH PLATTE BASIN
PRECIPITATION WAS 156 PERCENT OF AVERAGE. THE NORTH PLATTE PLAINS
BELOW GUERNSY RESERVOIR HAD 196 PERCENT. THE SOUTH PLATTE MOUNTAINS
HAD 88 PERCENT WHEREAS THE PLAINS HAD 141 PERCENT OF AVERAGE
JANUARY PRECIPITATION.
January 2018 Platte Mean Precip Oct-Jan WY2018 Platte Mean Precip
STREAM FLOW IN THE PLATTE BASIN IS FORECAST TO BE BELOW
AVERAGE DURING THE UPCOMING SPRING AND SUMMER. RUNOFF FOR
STREAMS ABOVE SEMINOE RESERVOIR ARE EXPECTED TO BE ABOUT
90 PERCENT OF AVERAGE. THE SOUTH PLATTE BASIN
AT SOUTH PLATTE, COLORADO CAN EXPECT 58 PERCENT OF AVERAGE
FLOW. FOR THE REMAINDER OF THE SOUTH PLATTE BASIN FLOWS ARE
EXPECTED NEAR 78 PERCENT OF AVERAGE.
STORED WATER IN THE SOUTH PLATTE BASIN WAS 109 PERCENT OF AVERAGE
ON FEBRUARY 1.
North Platte Streamflow Fcst South Platte Streamflow Fcst
000
FGUS63 KKRF 051434
ESPKRF
WATER SUPPLY FORECAST
NWS MISSOURI BASIN RIVER FORECAST CENTER
PLEASANT HILL MISSOURI
0830 CST MONDAY FEBRUARY 05 2018
DATA CURRENT AS OF: FEBRUARY 03 2018
MISSOURI/YELLOWSTONE/PLATTE RIVER BASIN FORECASTS
50% % 10% 90% AVG
FORECAST POINT PERIOD (KAF) AVG (KAF) (KAF) (KAF)
-------------------------------------------------------------------
BOYSEN RESERVOIR INFLOW APR-SEP 1448 133% 2185 1203 1085
SBDW4N
BIGHORN R AT KANE APR-SEP 2215 126% 3063 1812 1764
LVEW4N
GREYBULL R NR MEETEETSE APR-SEP 287 101% 439 217 284
MEEW4N
BUFFALO BILL RESERVOIR INFLOW APR-SEP 992 150% 1152 855 662
CDYW4N
ST MARY R NR BABB APR-SEP 376 86% 467 311 437
SMYM8N
ST MARY R AT INT BOUNDARY APR-SEP 429 85% 553 354 507
SMBM8N
MILK R NR CUTBANK APR-SEP 24 69% 60 11 35
PDBM8N
MILK R AT EASTERN CROSSING APR-SEP 40 65% 121 19 62
ERNM8N
NORTH PLATTE R NR NORTHGATE APR-SEP 255 112% 350 139 228
NGTC2
ENCAMPMENT R NR ENCAMPMENT APR-SEP 111 67% 146 74 166
ERCW4
ENCAMPMENT R NR ENCAMPMENT APR-SEP 120 68% 155 83 175
ECRW4N
ROCK CK NR ARLINGTON APR-SEP 47 103% 65 35 46
KCRW4
ROCK CK NR ARLINGTON APR-SEP 47 102% 65 36 46
KCRW4N
SEMINOE RESERVOIR INFLOW WY APR-SEP 688 92% 995 420 745
SETW4
SEMINOE RESERVOIR INFLOW WY APR-SEP 836 93% 1151 562 900
SETW4N
LARAMIE R NR WOODS APR-SEP 62 100% 103 28 61
WODW4
LARAMIE R NR WOODS APR-SEP 97 100% 138 60 97
WODW4N
LITTLE LARAMIE R NR FILMORE APR-SEP 57 112% 88 40 50
SMTW4
LITTLE LARAMIE R NR FILMORE APR-SEP 59 112% 90 42 53
SMTW4N
ANTERO RESERVOIR INFLOW APR-SEP 9 58% 16 4 16
ANRC2N
SPINNEY MOUNTAIN RES INFLOW APR-SEP 29 49% 61 20 59
SPYC2N
ELEVENMILE CANYON RES INFLOW APR-SEP 32 49% 66 20 65
EVNC2N
CHEESMAN LAKE INFLOW APR-SEP 64 52% 132 36 124
CHEC2N
SOUTH PLATTE R AT SOUTH PLATTE APR-SEP 121 58% 243 69 209
SPTC2N
BEAR CK AT MORRISON APR-SEP 12 62% 41 6 19
MRRC2N
CLEAR CK AT GOLDEN APR-SEP 90 81% 151 55 110
GLDC2N
ST VRAIN CK AT LYONS APR-SEP 66 69% 98 42 96
LNSC2N
BOULDER CK NR ORODELL APR-SEP 41 76% 79 27 54
OROC2N
S BOULDER CK NR ELDORADO SPR APR-SEP 27 73% 44 16 38
BELC2N
CACHE LA POUDRE AT CANYON MOUTH APR-SEP 173 84% 273 104 205
FTDC2N
LIMA RESERVOIR INFLOW APR-SEP 42 64% 72 20 66
LRRM8N
CLARK CANYON RESERVOIR INFLOW APR-SEP 110 62% 189 69 177
CLKM8N
BEAVERHEAD R AT BARRETTS APR-SEP 143 68% 226 98 210
BARM8N
RUBY R RESERVOIR INFLOW APR-SEP 94 104% 121 73 90
ALRM8N
BIG HOLE R NR MELROSE APR-SEP 737 140% 951 523 525
MLRM8
BIG HOLE R NR MELROSE APR-SEP 794 136% 1010 581 583
MLRM8N
HEBGEN RESERVOIR INFLOW APR-SEP 501 121% 583 431 415
HBDM8N
ENNIS RESERVOIR INFLOW APR-SEP 874 120% 1003 741 731
ELMM8N
GALLATIN R NR GATEWAY APR-SEP 584 126% 683 476 464
GLGM8
GALLATIN R NR GATEWAY APR-SEP 584 132% 683 476 442
GLGM8N
GALLATIN R AT LOGAN APR-SEP 587 130% 772 448 451
LOGM8
GALLATIN R AT LOGAN APR-SEP 731 125% 901 595 583
LOGM8N
MISSOURI R AT TOSTON APR-SEP 3057 126% 3970 2555 2430
TOSM8N
MISSOURI R AT FORT BENTON APR-SEP 4374 112% 5679 3548 3921
FBNM8N
MISSOURI R NR VIRGELLE APR-SEP 5027 116% 6375 3925 4324
VRGM8N
MISSOURI R NR LANDUSKY APR-SEP 5305 118% 6793 4172 4512
LDKM8N
MISSOURI R BLW FT PECK DAM APR-SEP 5547 118% 7190 4428 4706
FPKM8N
GIBSON RESERVOIR INFLOW APR-SEP 488 134% 684 393 365
AGSM8N
MARIAS R NR SHELBY APR-SEP 371 122% 529 262 304
SHLM8N
MUSSELSHELL R AT HARLOWTON APR-SEP 73 95% 152 43 77
HLWM8N
YELLOWSTONE R AT YELLOWSTONE LK APR-SEP 1069 155% 1197 922 688
YLOW4APR
YELLOWSTONE R AT YELLOWSTONE LK APR-SEP 1283 148% 1427 1129 868
YLOW4N
YELLOWSTONE R AT CORWIN SPRINGS APR-SEP 2594 152% 2825 2194 1712
CORM8
YELLOWSTONE R AT CORWIN SPRINGS APR-SEP 2905 146% 3193 2498 1986
CORM8N
YELLOWSTONE R AT LIVINGSTON APR-SEP 2955 148% 3246 2519 2000
LIVM8
YELLOWSTONE R AT LIVINGSTON APR-SEP 3356 142% 3651 2887 2365
LIVM8N
YELLOWSTONE R AT BILLINGS APR-SEP 4992 146% 5552 4177 3423
BILM8
YELLOWSTONE R AT BILLINGS APR-SEP 6171 138% 6702 5294 4464
BILM8N
YELLOWSTONE R AT MILES CITY APR-SEP 10094 133% 11888 8476 7604
MILM8N
YELLOWSTONE R AT SIDNEY APR-SEP 10559 132% 12352 8659 8022
SIDM8N
BOULDER R AT BIG TIMBER APR-SEP 295 123% 332 240 240
BTMM8
BOULDER R AT BIG TIMBER APR-SEP 401 117% 436 347 343
BTMM8N
STILLWATER R NR ABSAROKEE APR-SEP 631 119% 709 541 532
SRAM8
STILLWATER R NR ABSAROKEE APR-SEP 684 116% 767 600 590
SRAM8N
CLARKS FK YELWSTONE R NR BELFRY APR-SEP 887 171% 1011 799 520
BFYM4
CLARKS FK YELWSTONE R NR BELFRY APR-SEP 957 162% 1081 871 591
BFYM4N
BIGHORN R NR ST XAVIER APR-SEP 3355 135% 4325 2671 2478
STXM8N
LITTLE BIGHORN R NR HARDIN APR-SEP 95 92% 147 68 103
HRDM8N
TONGUE R NR DAYTON APR-SEP 90 94% 113 63 96
DAYW4N
TONGUE R NR DECKER APR-SEP 196 86% 261 142 227
DSLM8N
TONGUE R RESERVOIR INFLOW APR-SEP 200 88% 264 144 228
DKRM8N
POWDER R NR LOCATE APR-SEP 228 81% 432 142 282
MHDM8
POWDER R NR LOCATE APR-SEP 252 79% 480 149 317
LOCM8N
LOCATIONS WITH AN "N" SUFFIX INDICATE NATURAL FLOWS EXCLUDING
STREAM AUGMENTATIONS
KAF: THOUSANDS OF ACRE-FEET
%AVG: CURRENT 50%/AVG
AVG: AVERAGE (50%) SEASONAL RUNOFF VOLUME AS SIMULATED BY THE
RIVER FORECAST MODEL CONSIDERING A CONTINUOUS SIMULATION OF THE
BASIN RESPONSE TO HISTORIC CLIMATE DATA (OBSERVED PRECIPITATION
AND TEMPERATURES) OVER THE PERIOD OF 1981-2010
THE 50%, 10% AND 90% COLUMNS INDICATE THE PROBABILITY THAT THE
ACTUAL VOLUME WILL EXCEED THE FORECAST FOR THE VALID TIME PERIOD
FOR MORE INFORMATION PLEASE VISIT: WWW.WEATHER.GOV/MBRFC/WATER
