January 1, 2018 Spring and Summer Streamflow Forecasts
Missouri River Basin Mountain Snowpack as of January 1, 2018
Upper Missouri Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER MISSOURI BASIN AS OF
JANUARY 1 WAS NEAR TO ABOVE AVERAGE. THE SNOW PACK ABOVE FORT PECK,
MONTANA WAS 138 PERCENT. THE SNOW PACK IN THE ST MARY BASIN WAS 91
PERCENT, AND THE MILK RIVER BASIN WAS 142 PERCENT.
DECEMBER PRECIPITATION ACROSS THE UPPER MISSOURI BASIN WAS
ABOVE AVERAGE. BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN
INCLUDE: MILK ST. MARY, 223 PERCENT; MILK CANADA, 278 PERCENT;
LOWER MILK, 195 PERCENT; ABOVE TOSTON, 136 PERCENT; TOSTON TO
FT. PECK, 228 PERCENT.
December 2017 Upper Missouri Mean Precip Oct-Dec WY2018 Upper Missouri Mean Precip
STREAM FLOW IN THE UPPER MISSOURI BASIN IS FORECAST TO BE
BELOW AVERAGE DURING THE UPCOMING SPRING AND SUMMER. THE ST.
MARY RIVER IS FORECAST TO HAVE 75 PERCENT OF AVERAGE APRIL-SEPTEMBER
FLOWS. RUNOFF IS EXPECTED TO RANGE AROUND 95 PERCENT OF AVERAGE
FOR THE MISSOURI BASIN ABOVE FORT PECK, MONTANA.
Upper Missouri January 1, 2018 Spring and Summer Streamflow Forecasts
OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA: LIMA RESERVOIR
HAD 187 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 115 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 37 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 95 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; 93 AND 117 PERCENT OF AVERAGE WATER, RESPECTIVELY.
Yellowstone Basin
THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS ABOVE
AVERAGE ON JANUARY 1. THE SNOW PACK IN THE UPPER YELLOWSTONE BASIN WAS
161 PERCENT OF AVERAGE. THE SNOW PACKS IN THE WIND, BIGHORN, AND
SHOSHONE BASINS WERE 142, 143, AND 158 PERCENT OF AVERAGE,
RESPECTIVELY. THE SNOW PACKS IN THE TONGUE AND POWDER BASINS WERE
106 AND 116 PERCENT OF AVERAGE, RESPECTIVELY.
PRECIPITATION DURING DECEMBER WAS ABOVE AVERAGE. THE UPPER
YELLOWSTONE RIVER BASIN RECEIVED 196 PERCENT OF AVERAGE PRECIPITATION
WHILE THE LOWER YELLOWSTONE BASIN REPORTED 177 PERCENT OF AVERAGE.
THE BIGHORN BASIN RECEIVED 178 PERCENT OF AVERAGE PRECIPITATION
WHILE THE WIND RIVER BASIN RECEIVED 204 PERCENT OF AVERAGE.
THE LITTLE BIGHORN - UPPER TONGUE BASIN RECEIVED 149 PERCENT OF
AVERAGE AND THE POWDER RIVER HAD 140 PERCENT OF AVERAGE PRECIPITATION.
December 2017 Yellowstone Mean Precip Oct-Dec 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 120 PERCENT OF AVERAGE. FLOW IN THE
TONGUE BASIN IS EXPECTED TO BE 80 PERCENT OF AVERAGE. FLOWS IN THE
POWDER RIVER ARE EXPECTED TO BE ABOUT 75 PERCENT OF AVERAGE.
MONTHEND STORAGE AT BOYSEN RESERVOIR WAS 119 PERCENT OF AVERAGE.
STORED WATER IN BUFFALO BILL RESERVOIR WAS 138 PERCENT OF AVERAGE.
MONTHEND STORAGE WAS 105 PERCENT OF AVERAGE AT BIGHORN RESERVOIR.
Yellowstone January 1, 2018 Spring and Summer Streamflow Forecasts
Platte Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS
82 PERCENT OF AVERAGE ON JANUARY 1. THE SNOW PACK IN THE NORTH
PLATTE BASIN BELOW SEMINOE RESERVOIR WAS 69 PERCENT OF AVERAGE.
THE SNOW PACK IN THE SOUTH PLATTE BASIN WAS 86 PERCENT OF AVERAGE.
PRECIPITATION DURING DECEMBER IN THE UPPER NORTH PLATTE
BASIN WAS 75 PERCENT OF AVERAGE. IN THE LOWER NORTH PLATTE BASIN
PRECIPITATION WAS 117 PERCENT OF AVERAGE. THE NORTH PLATTE PLAINS
BELOW GUERNSY RESERVOIR HAD 119 PERCENT. THE SOUTH PLATTE MOUNTAINS
HAD 58 PERCENT WHEREAS THE PLAINS HAD 54 PERCENT OF AVERAGE
DECEMBER PRECIPITATION.
December 2017 Platte Mean Precip Oct-Dec 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. STREAMS IN THE SOUTH PLATTE BASIN ABOVE SOUTH PLATTE, COLORADO CAN EXPECT 68 PERCENT OF AVERAGE FLOW. FOR THE REMAINDER OF THE SOUTH PLATTE BASIN FLOWS ARE EXPECTED NEAR 80 PERCENT OF AVERAGE. STORED WATER IN THE SOUTH PLATTE BASIN WAS 114 PERCENT OF AVERAGE ON JANUARY 1.
North Platte Streamflow Fcst South Platte Streamflow Fcst
WATER SUPPLY FORECAST
NWS MISSOURI BASIN RIVER FORECAST CENTER
PLEASANT HILL MISSOURI
1030 CST WEDNESDAY JANUARY 03 2018
DATA CURRENT AS OF: JANUARY 01 2018
MISSOURI/YELLOWSTONE/PLATTE RIVER BASIN FORECASTS
50% % 10% 90% AVG
FORECAST POINT PERIOD (KAF) AVG (KAF) (KAF) (KAF)
-----------------------------------------------------------------
BOYSEN RESERVOIR INFLOW APR-SEP 1441 133% 2194 1108 1085
SBDW4N
BIGHORN R AT KANE APR-SEP 1994 113% 2978 1520 1764
LVEW4N
GREYBULL R NR MEETEETSE APR-SEP 224 79% 355 153 284
MEEW4N
BUFFALO BILL RESERVOIR INFLOW APR-SEP 865 131% 1070 657 662
CDYW4N
ST MARY R NR BABB APR-SEP 324 74% 438 264 437
SMYM8N
ST MARY R AT INT BOUNDARY APR-SEP 377 74% 522 308 507
SMBM8N
MILK R NR CUTBANK APR-SEP 27 76% 76 13 35
PDBM8N
MILK R AT EASTERN CROSSING APR-SEP 47 76% 132 23 62
ERNM8N
NORTH PLATTE R NR NORTHGATE APR-SEP 212 93% 324 109 228
NGTC2
ENCAMPMENT R NR ENCAMPMENT APR-SEP 127 76% 187 79 166
ERCW4
ENCAMPMENT R NR ENCAMPMENT APR-SEP 136 78% 196 88 175
ECRW4N
ROCK CK NR ARLINGTON APR-SEP 49 108% 69 34 46
KCRW4
ROCK CK NR ARLINGTON APR-SEP 50 108% 70 35 46
KCRW4N
SEMINOE RESERVOIR INFLOW WY APR-SEP 648 87% 947 388 745
SETW4
SEMINOE RESERVOIR INFLOW WY APR-SEP 813 90% 1090 528 900
SETW4N
LARAMIE R NR WOODS APR-SEP 44 72% 73 18 61
WODW4
LARAMIE R NR WOODS APR-SEP 80 82% 109 47 97
WODW4N
LITTLE LARAMIE R NR FILMORE APR-SEP 61 120% 90 34 50
SMTW4
LITTLE LARAMIE R NR FILMORE APR-SEP 63 119% 92 37 53
SMTW4N
ANTERO RESERVOIR INFLOW APR-SEP 15 91% 25 9 16
ANRC2N
SPINNEY MOUNTAIN RES INFLOW APR-SEP 40 68% 83 25 59
SPYC2N
ELEVENMILE CANYON RES INFLOW APR-SEP 42 65% 88 27 65
EVNC2N
CHEESMAN LAKE INFLOW APR-SEP 80 65% 168 43 124
CHEC2N
SOUTH PLATTE R AT SOUTH PLATTE APR-SEP 145 69% 301 79 209
SPTC2N
BEAR CK AT MORRISON APR-SEP 11 56% 39 6 19
MRRC2N
CLEAR CK AT GOLDEN APR-SEP 79 71% 134 40 110
GLDC2N
ST VRAIN CK AT LYONS APR-SEP 80 83% 110 46 96
LNSC2N
BOULDER CK NR ORODELL APR-SEP 45 83% 90 27 54
OROC2N
S BOULDER CK NR ELDORADO SPR APR-SEP 30 79% 51 17 38
BELC2N
CACHE LA POUDRE AT CANYON MOUTH APR-SEP 168 82% 255 85 205
FTDC2N
LIMA RESERVOIR INFLOW APR-SEP 63 95% 109 39 66
LRRM8N
CLARK CANYON RESERVOIR INFLOW APR-SEP 138 78% 223 78 177
CLKM8N
BEAVERHEAD R AT BARRETTS APR-SEP 165 78% 258 103 210
BARM8N
RUBY R RESERVOIR INFLOW APR-SEP 93 104% 116 69 90
ALRM8N
BIG HOLE R NR MELROSE APR-SEP 524 100% 696 321 525
MLRM8
BIG HOLE R NR MELROSE APR-SEP 581 100% 752 379 583
MLRM8N
HEBGEN RESERVOIR INFLOW APR-SEP 412 99% 526 312 415
HBDM8N
ENNIS RESERVOIR INFLOW APR-SEP 680 93% 823 510 731
ELMM8N
GALLATIN R NR GATEWAY APR-SEP 426 92% 547 310 464
GLGM8
GALLATIN R NR GATEWAY APR-SEP 426 96% 547 310 442
GLGM8N
GALLATIN R AT LOGAN APR-SEP 428 95% 616 275 451
LOGM8
GALLATIN R AT LOGAN APR-SEP 563 97% 733 407 583
LOGM8N
MISSOURI R AT TOSTON APR-SEP 2561 105% 3328 1823 2430
TOSM8N
MISSOURI R AT FORT BENTON APR-SEP 3620 92% 4756 2589 3921
FBNM8N
MISSOURI R NR VIRGELLE APR-SEP 4045 94% 5484 2991 4324
VRGM8N
MISSOURI R NR LANDUSKY APR-SEP 4331 96% 5867 3210 4512
LDKM8N
MISSOURI R BLW FT PECK DAM APR-SEP 4623 98% 6160 3356 4706
FPKM8N
GIBSON RESERVOIR INFLOW APR-SEP 406 111% 639 320 365
AGSM8N
MARIAS R NR SHELBY APR-SEP 375 123% 601 286 304
SHLM8N
MUSSELSHELL R AT HARLOWTON APR-SEP 57 74% 109 26 77
HLWM8N
YELLOWSTONE R AT YELLOWSTONE LK APR-SEP 1033 150% 1199 811 688
YLOW4APR
YELLOWSTONE R AT YELLOWSTONE LK APR-SEP 1288 148% 1488 1047 868
YLOW4N
YELLOWSTONE R AT CORWIN SPRINGS APR-SEP 2282 133% 2650 1792 1712
CORM8
YELLOWSTONE R AT CORWIN SPRINGS APR-SEP 2653 134% 3074 2112 1986
CORM8N
YELLOWSTONE R AT LIVINGSTON APR-SEP 2589 129% 2982 2030 2000
LIVM8
YELLOWSTONE R AT LIVINGSTON APR-SEP 3000 127% 3469 2415 2365
LIVM8N
YELLOWSTONE R AT BILLINGS APR-SEP 4168 122% 4904 3224 3423
BILM8
YELLOWSTONE R AT BILLINGS APR-SEP 5341 120% 6111 4324 4464
BILM8N
YELLOWSTONE R AT MILES CITY APR-SEP 8746 115% 10499 6875 7604
MILM8N
YELLOWSTONE R AT SIDNEY APR-SEP 9163 114% 10795 7045 8022
SIDM8N
BOULDER R AT BIG TIMBER APR-SEP 259 108% 303 187 240
BTMM8
BOULDER R AT BIG TIMBER APR-SEP 357 104% 408 289 343
BTMM8N
STILLWATER R NR ABSAROKEE APR-SEP 515 97% 606 399 532
SRAM8
STILLWATER R NR ABSAROKEE APR-SEP 575 97% 663 458 590
SRAM8N
CLARKS FK YELWSTONE R NR BELFRY APR-SEP 646 124% 786 536 520
BFYM4
CLARKS FK YELWSTONE R NR BELFRY APR-SEP 716 121% 857 609 591
BFYM4N
BIGHORN R NR ST XAVIER APR-SEP 2976 120% 4002 2231 2478
STXM8N
LITTLE BIGHORN R NR HARDIN APR-SEP 97 95% 146 62 103
HRDM8N
TONGUE R NR DAYTON APR-SEP 86 90% 111 59 96
DAYW4N
TONGUE R NR DECKER APR-SEP 164 72% 226 112 227
DSLM8N
TONGUE R RESERVOIR INFLOW APR-SEP 166 73% 229 113 228
DKRM8N
POWDER R NR LOCATE APR-SEP 221 78% 430 135 282
MHDM8
POWDER R NR LOCATE A APR-SEP 226 71% 475 141 317
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 1979-2001
THE 50%, 10%, AND 90% COLUMNS INDICATE THE PROBABLILITY THAT THE
ACTUAL VOLUME WILL EXCEED THE FORECAST FOR THE VALID TIME PERIOD
FOR MORE INFORMATION, PLEASE VISIT: WWW.WEATHER.GOV/MBRFC/WATER
