January 1, 2019 Spring and Summer Streamflow Forecasts
Upper Missouri Basin
The high elevation snow pack in the Upper Missouri Basin as of January 1
was near average. The snow pack above Fort Peck, Montana was
87 percent. The snow pack in the St. Mary Basin was 84 percent, and the
Milk River Basin was 91 percent.
December precipitation across the Upper Missouri Basin was near to above average.
Basin precipitation summaries for the Missouri Basin include: Milk St. Mary,
92 percent; Milk Canada, 66 percent; Lower Milk, 111 percent; above Toston,
64 percent; Toston to Ft. Peck, 88 percent.
December 2018 Upper Missouri Mean Precip Oct-Dec WY2019 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 80 percent of average
April-September flows. Runoff is expected to range around
81 percent of average for the Missouri Basin above Fort Peck,
Montana.
Upper Missouri January 1, 2019 Spring and Summer Streamflow Forecasts
Of the four major irrigation reservoirs in Montana; Lima
Reservoir had 172 percent average storage, Clark Canyon was
holding 129 percent of average water, Gibson Reservoir had 47
percent of average stored water, and Fresno Reservoir had
99 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; 101 and 119 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 98 percent
of average. The snow packs in the Wind, Bighorn, and Shoshone Basins were 80,
104, and 103 percent of average, respectively. The snow packs in the Tongue
and Powder basins were 84 and 106 percent of average, respectively.
Precipitation during December was near to above average. The upper Yellowstone
River Basin received 87 percent of average precipitation while the
Lower Yellowstone River Basin reported 144 percent of average. The
Bighorn Basin received 93 percent of average precipitation while the
Wind River Basin received 73 percent of average. The Little Bighorn -
Upper Tongue Basin received 78 percent of average and the Powder River
had 185 percent of average precipitation.
December 2018 Yellowstone Mean Precip Oct-Dec WY2019 Yellowstone Mean Precip
Forecast stream flow in the Yellowstone Basin is near average
for the upcoming Spring and Summer. Stream flow for the
Yellowstone River above Sidney, Montana is forecast to be about
89 percent of average. Flow in the Tongue Basin is expected to be
90 percent of average. Flows in the Powder River are expected
to be about 82 percent of average.
Monthend storage at Boysen Reservoir was 110 percent of average.
Stored water in Buffalo Bill Reservoir was 128 percent of average.
Monthend storage was 100 percent of average at Bighorn Reservoir.
Yellowstone January 1, 2019 Spring and Summer Streamflow Forecasts
Platte Basin
The high elevation snow pack in the Upper North Platte Basin was
101 percent of average on January 1. The snow pack in the North Platte
Basin below Seminoe Reservoir was 109 percent of average. The snow
pack in the South Platte Basin was 92 percent of average.
Precipitation during December in the Upper North Platte Basin was 48
percent of average. In the Lower North Platte Basin, precipitation
was 60 percent of average. The North Platte Plains below Guernsy
Reservoir had 64 percent. The South Platte Mountains had 31
percent whereas the Plains had 27 percent of average December
precipitation.
December 2018 Platte Mean Precip Oct-Dec WY2019 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 65 percent of average. Streams in the South Platte
Basin above South Platte, Colorado can expect 79 percent
of average flow. For the remainder of the South Platte
basin, flows are expected near 60 percent.
Stored water in the South Platte Basin was 99 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
1100 CST WEDNESDAY JANUARY 02 2019
DATA CURRENT AS OF: JANUARY 01 2019
MISSOURI/YELLOWSTONE/PLATTE RIVER BASIN FORECASTS
50% % 10% 90% AVG
FORECAST POINT PERIOD (KAF) AVG (KAF) (KAF) (KAF)
------------------------------------------------------------------
BOYSEN RESERVOIR INFLOW APR-SEP 711 68% 1247 430 1047
SBDW4N
BIGHORN R AT KANE APR-SEP 1096 67% 1931 734 1633
LVEW4N
GREYBULL R NR MEETEETSE APR-SEP 151 64% 240 72 235
MEEW4N
BUFFALO BILL RESERVOIR INFLOW APR-SEP 569 84% 760 399 679
CDYW4N
ST MARY R NR BABB APR-SEP 333 80% 454 282 418
SMYM8N
ST MARY R AT INT BOUNDARY APR-SEP 389 80% 540 331 485
SMBM8N
MILK R NR CUTBANK APR-SEP 24 60% 58 10 40
PDBM8N
MILK R AT EASTERN CROSSING APR-SEP 43 62% 106 18 70
ERNM8N
NORTH PLATTE R NR NORTHGATE APR-SEP 210 62% 356 88 340
NGTC2
ENCAMPMENT R NR ENCAMPMENT APR-SEP 99 64% 151 47 154
ERCW4
ENCAMPMENT R NR ENCAMPMENT APR-SEP 107 66% 160 56 163
ECRW4N
ROCK CK NR ARLINGTON APR-SEP 42 82% 58 29 51
KCRW4
ROCK CK NR ARLINGTON APR-SEP 42 83% 58 29 51
KCRW4N
SEMINOE RESERVOIR INFLOW WY APR-SEP 583 62% 928 263 938
SETW4
SEMINOE RESERVOIR INFLOW WY APR-SEP 726 66% 1082 394 1103
SETW4N
LARAMIE R NR WOODS APR-SEP 35 45% 89 11 79
WODW4
LARAMIE R NR WOODS APR-SEP 70 62% 124 36 114
WODW4N
LITTLE LARAMIE R NR FILMORE APR-SEP 46 94% 71 28 49
SMTW4
LITTLE LARAMIE R NR FILMORE APR-SEP 49 94% 73 30 52
SMTW4N
ANTERO RESERVOIR INFLOW APR-SEP 14 78% 21 9 17
ANRC2N
SPINNEY MOUNTAIN RES INFLOW APR-SEP 40 75% 73 27 53
SPYC2N
ELEVENMILE CANYON RES INFLOW APR-SEP 43 74% 83 29 58
EVNC2N
CHEESMAN LAKE INFLOW APR-SEP 85 77% 166 52 110
CHEC2N
SOUTH PLATTE R AT SOUTH PLATTE APR-SEP 158 81% 294 103 197
SPTC2N
BEAR CK AT MORRISON APR-SEP 12 49% 41 7 24
MRRC2N
CLEAR CK AT GOLDEN APR-SEP 97 77% 156 64 125
GLDC2N
ST VRAIN CK AT LYONS APR-SEP 85 89% 113 56 96
LNSC2N
BOULDER CK NR ORODELL APR-SEP 46 91% 69 37 51
OROC2N
S BOULDER CK NR ELDORADO SPR APR-SEP 25 68% 45 15 37
BELC2N
CACHE LA POUDRE AT CANYON MOUTH APR-SEP 181 86% 313 103 212
FTDC2N
LIMA RESERVOIR INFLOW APR-SEP 36 61% 68 22 60
LRRM8N
CLARK CANYON RESERVOIR INFLOW APR-SEP 108 78% 158 69 137
CLKM8N
BEAVERHEAD R AT BARRETTS APR-SEP 130 76% 181 90 170
BARM8N
RUBY R RESERVOIR INFLOW APR-SEP 74 86% 95 53 87
ALRM8N
BIG HOLE R NR MELROSE APR-SEP 399 79% 567 244 506
MLRM8
BIG HOLE R NR MELROSE APR-SEP 456 81% 622 300 563
MLRM8N
HEBGEN RESERVOIR INFLOW APR-SEP 380 97% 486 291 393
HBDM8N
ENNIS RESERVOIR INFLOW APR-SEP 680 97% 806 507 700
ELMM8N
GALLATIN R NR GATEWAY APR-SEP 301 65% 391 196 460
GLGM8
GALLATIN R NR GATEWAY APR-SEP 301 65% 391 196 460
GLGM8N
GALLATIN R AT LOGAN APR-SEP 273 60% 416 158 455
LOGM8
GALLATIN R AT LOGAN APR-SEP 407 71% 538 271 575
LOGM8N
MISSOURI R AT TOSTON APR-SEP 2051 80% 2669 432 2561
TOSM8N
MISSOURI R AT FORT BENTON APR-SEP 3094 80% 4083 258 3866
FBNM8N
MISSOURI R NR VIRGELLE APR-SEP 3576 82% 4791 657 4350
VRGM8N
MISSOURI R NR LANDUSKY APR-SEP 3770 83% 5158 768 4535
LDKM8N
MISSOURI R BLW FT PECK DAM APR-SEP 4050 84% 5463 937 4817
FPKM8N
GIBSON RESERVOIR INFLOW APR-SEP 246 70% 447 169 351
AGSM8N
MARIAS R NR SHELBY APR-SEP 306 71% 595 214 428
SHLM8N
MUSSELSHELL R AT HARLOWTON APR-SEP 89 81% 142 56 110
HLWM8N
YELLOWSTONE R AT YELLOWSTONE LK APR-SEP 510 78% 661 346 657
YLOW4APR
YELLOWSTONE R AT YELLOWSTONE LK APR-SEP 718 87% 926 499 824
YLOW4N
YELLOWSTONE R AT CORWIN SPRINGS APR-SEP 1367 82% 1685 966 1673
CORM8
YELLOWSTONE R AT CORWIN SPRINGS APR-SEP 1660 87% 2055 173 1912
CORM8N
YELLOWSTONE R AT LIVINGSTON APR-SEP 1629 85% 1984 196 1913
LIVM8
YELLOWSTONE R AT LIVINGSTON APR-SEP 1981 90% 2421 442 2209
LIVM8N
YELLOWSTONE R AT BILLINGS APR-SEP 2717 82% 3397 955 3322
BILM8
YELLOWSTONE R AT BILLINGS APR-SEP 3761 87% 4517 882 4330
BILM8N
YELLOWSTONE R AT MILES CITY APR-SEP 5878 80% 7468 400 7334
MILM8N
YELLOWSTONE R AT SIDNEY APR-SEP 6234 81% 7718 613 7676
SIDM8N
BOULDER R AT BIG TIMBER APR-SEP 165 61% 216 115 273
BTMM8
BOULDER R AT BIG TIMBER APR-SEP 264 84% 315 203 314
BTMM8N
STILLWATER R NR ABSAROKEE APR-SEP 414 84% 493 307 496
SRAM8
STILLWATER R NR ABSAROKEE APR-SEP 470 85% 549 363 552
SRAM8N
CLARKS FK YELWSTONE R NR BELFRY APR-SEP 380 78% 503 271 490
BFYM4
CLARKS FK YELWSTONE R NR BELFRY APR-SEP 450 80% 573 344 562
BFYM4N
BIGHORN R NR ST XAVIER APR-SEP 1836 77% 2686 175 2382
STXM8N
LITTLE BIGHORN R NR HARDIN APR-SEP 95 118% 138 71 80
HRDM8N
TONGUE R NR DAYTON APR-SEP 85 104% 110 58 82
DAYW4N
TONGUE R NR DECKER APR-SEP 193 87% 277 125 221
DSLM8N
TONGUE R RESERVOIR INFLOW APR-SEP 194 87% 284 125 222
DKRM8N
POWDER R NR LOCATE APR-SEP 171 79% 337 113 215
MHDM8
POWDER R NR LOCATE APR-SEP 192 78% 425 124 247
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
