April 1, 2018 Spring and Summer Streamflow Forecasts
Missouri River Basin Mountain Snowpack as of April 1, 2018
Upper Missouri Basin
The high elevation snow pack in the Upper Missouri Basin as of April 1
was above average. The snow pack above Fort Peck, Montana was
144 percent. The snow pack in the St. Mary Basin was 136 percent, and the
Milk River Basin was 164 percent.
March precipitation across the Upper Missouri Basin was near to above average.
Basin precipitation summaries for the Missouri Basin include: Milk St. Mary,
82 percent; Milk Canada, 108 percent; Lower Milk, 194 percent; above Toston,
123 percent; Toston to Ft. Peck, 129 percent.
March 2018 Upper Missouri Mean Precip Oct-Mar WY2018 Upper Missouri Mean Precip
Stream flow in the Upper Missouri Basin is forecast to be
above average during the upcoming Spring and Summer.
The St. Mary River is forecast to have 111 percent of average
April-September flows. Runoff is expected to range around
135 percent of average for the Missouri Basin above Fort Peck,
Montana.
Upper Missouri April 1, 2018 Spring and Summer Streamflow Forecasts
Of the four major irrigation reservoirs in Montana; Lima
Reservoir had 177 percent average storage, Clark Canyon was
holding 122 percent of average water, Gibson Reservoir had 24
percent of average stored water, and Fresno Reservoir had
77 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 118 percent of average water, respectively.
Yellowstone Basin
The high elevation snow pack in the Yellowstone Basin was above average on April 1. The snow pack in the Upper Yellowstone Basin was 152 percent of average. The snow packs in the Wind, Bighorn, and Shoshone Basins were 118, 134, and 144 percent of average, respectively. The snow packs in the Tongue and Powder basins were 109 and 125 percent of average, respectively. Precipitation during March was near to above average. The upper Yellowstone River Basin received 96 percent of average precipitation while the Lower Yellowstone River Basin reported 113 percent of average. The Bighorn Basin received 80 percent of average precipitation while the Wind River Basin received 98 percent of average. The Little Bighorn - Upper Tongue Basin received 95 percent of average and the Powder River had 142 percent of average precipitation.
March 2018 Yellowstone Mean Precip Oct-Mar WY2018 Yellowstone Mean Precip
Forecast stream flow in the Yellowstone Basin ranged from near
to above average for the upcoming Spring and Summer. Stream flow
for the Yellowstone River above Sidney, Montana is forecast to be
about 155 percent of average. Flow in the Tongue Basin is expected
to be 100 percent of average. Flows in the Powder River are expected
to be about 120 percent of average.
Monthend storage at Boysen Reservoir was 109 percent of average.
Stored water in Buffalo Bill Reservoir was 121 percent of average.
Monthend storage was 96 percent of average at Bighorn Reservoir.
Yellowstone April 1, 2018 Spring and Summer Streamflow Forecasts
Platte Basin
The high elevation snow pack in the Upper North Platte Basin was
89 percent of average on April 1. The snow pack in the North Platte
Basin below Seminoe Reservoir was 92 percent of average. The snow
pack in the South Platte Basin was 83 percent of average.
Precipitation during March in the Upper North Platte Basin was 81
percent of average. In the Lower North Platte Basin, precipitation
was 96 percent of average. The North Platte Plains below Guernsy
Reservoir had 149 percent. The South Platte Mountains had 71
percent whereas the Plains had 73 percent of average March
precipitation.
March 2018 Platte Mean Precip Oct-Mar 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 40 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 106 percent of average
on April 1.
North Platte Streamflow Fcst South Platte Streamflow Fcst
000
FGUS63 KKRF 031437
ESPKRF
WATER SUPPLY FORECAST
NWS MISSOURI BASIN RIVER FORECAST CENTER
PLEASANT HILL MISSOURI
0935 CST TUESDAY APRIL 03 2018
DATA CURRENT AS OF: APRIL 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 1503 139% 2080 1186 1082
SBDW4N
BIGHORN R AT KANE APR-SEP 2308 131% 3129 1839 1760
LVEW4N
GREYBULL R NR MEETEETSE APR-SEP 282 99% 377 214 284
MEEW4N
BUFFALO BILL RESERVOIR INFLOW APR-SEP 1034 156% 1164 878 662
CDYW4N
ST MARY R NR BABB APR-SEP 481 110% 565 406 437
SMYM8N
ST MARY R AT INT BOUNDARY APR-SEP 570 112% 691 480 507
SMBM8N
MILK R NR CUTBANK APR-SEP 42 119% 122 27 35
PDBM8N
MILK R AT EASTERN CROSSING APR-SEP 88 144% 246 61 61
ERNM8N
NORTH PLATTE R NR NORTHGATE APR-SEP 195 86% 337 128 227
NGTC2
ENCAMPMENT R NR ENCAMPMENT APR-SEP 91 55% 126 72 166
ERCW4
ENCAMPMENT R NR ENCAMPMENT APR-SEP 100 58% 135 81 174
ECRW4N
ROCK CK NR ARLINGTON APR-SEP 44 96% 52 34 45
KCRW4
ROCK CK NR ARLINGTON APR-SEP 44 96% 53 34 46
KCRW4N
SEMINOE RESERVOIR INFLOW WY APR-SEP 546 73% 782 382 744
SETW4
SEMINOE RESERVOIR INFLOW WY APR-SEP 692 77% 925 518 897
SETW4N
LARAMIE R NR WOODS APR-SEP 46 75% 79 25 61
WODW4
LARAMIE R NR WOODS APR-SEP 81 84% 114 56 97
WODW4N
LITTLE LARAMIE R NR FILMORE APR-SEP 65 129% 83 50 50
SMTW4
LITTLE LARAMIE R NR FILMORE APR-SEP 67 128% 85 52 53
SMTW4N
ANTERO RESERVOIR INFLOW APR-SEP 5 34% 10 3 16
ANRC2N
SPINNEY MOUNTAIN RES INFLOW APR-SEP 20 34% 35 13 59
SPYC2N
ELEVENMILE CANYON RES INFLOW APR-SEP 22 34% 41 14 65
EVNC2N
CHEESMAN LAKE INFLOW APR-SEP 41 33% 91 27 123
CHEC2N
SOUTH PLATTE R AT SOUTH PLATTE APR-SEP 79 38% 179 54 209
SPTC2N
BEAR CK AT MORRISON APR-SEP 8 41% 21 5 19
MRRC2N
CLEAR CK AT GOLDEN APR-SEP 68 62% 117 46 110
GLDC2N
ST VRAIN CK AT LYONS APR-SEP 54 56% 85 39 96
LNSC2N
BOULDER CK NR ORODELL APR-SEP 31 57% 68 22 54
OROC2N
S BOULDER CK NR ELDORADO SPR APR-SEP 19 50% 37 11 38
BELC2N
CACHE LA POUDRE AT CANYON MOUTH APR-SEP 147 72% 225 103 205
FTDC2N
LIMA RESERVOIR INFLOW APR-SEP 50 75% 83 32 66
LRRM8N
CLARK CANYON RESERVOIR INFLOW APR-SEP 135 77% 222 95 176
CLKM8N
BEAVERHEAD R AT BARRETTS APR-SEP 175 83% 267 130 209
BARM8N
RUBY R RESERVOIR INFLOW APR-SEP 105 117% 126 80 90
ALRM8N
BIG HOLE R NR MELROSE APR-SEP 849 162% 1172 697 523
MLRM8
BIG HOLE R NR MELROSE APR-SEP 908 156% 1231 759 581
MLRM8N
HEBGEN RESERVOIR INFLOW APR-SEP 585 141% 657 529 414
HBDM8N
ENNIS RESERVOIR INFLOW APR-SEP 968 133% 1111 861 729
ELMM8N
GALLATIN R NR GATEWAY APR-SEP 538 116% 697 445 464
GLGM8
GALLATIN R NR GATEWAY APR-SEP 538 122% 697 445 442
GLGM8N
GALLATIN R AT LOGAN APR-SEP 614 137% 860 488 448
LOGM8
GALLATIN R AT LOGAN APR-SEP 751 129% 986 641 580
LOGM8N
MISSOURI R AT TOSTON APR-SEP 3548 146% 4587 3053 2422
TOSM8N
MISSOURI R AT FORT BENTON APR-SEP 5261 135% 6872 4638 3907
FBNM8N
MISSOURI R NR VIRGELLE APR-SEP 5773 134% 7582 5091 4300
VRGM8N
MISSOURI R NR LANDUSKY APR-SEP 6043 134% 7951 5363 4497
LDKM8N
MISSOURI R BLW FT PECK DAM APR-SEP 6400 137% 8427 5664 4685
FPKM8N
GIBSON RESERVOIR INFLOW APR-SEP 741 203% 935 665 365
AGSM8N
MARIAS R NR SHELBY APR-SEP 381 127% 529 284 301
SHLM8N
MUSSELSHELL R AT HARLOWTON APR-SEP 89 116% 162 37 77
HLWM8N
YELLOWSTONE R AT YELLOWSTONE LK APR-SEP 1177 171% 1334 1085 688
YLOW4APR
YELLOWSTONE R AT YELLOWSTONE LK APR-SEP 1421 164% 1555 1285 866
YLOW4N
YELLOWSTONE R AT CORWIN SPRINGS APR-SEP 2824 165% 3209 2567 1709
CORM8
YELLOWSTONE R AT CORWIN SPRINGS APR-SEP 3164 159% 3544 2885 1987
CORM8N
YELLOWSTONE R AT LIVINGSTON APR-SEP 3159 158% 3663 2869 1995
LIVM8
YELLOWSTONE R AT LIVINGSTON APR-SEP 3559 150% 4060 3244 2365
LIVM8N
YELLOWSTONE R AT BILLINGS APR-SEP 5782 169% 6963 5129 3418
BILM8
YELLOWSTONE R AT BILLINGS APR-SEP 6936 156% 8093 6269 4456
BILM8N
YELLOWSTONE R AT MILES CITY APR-SEP 11378 150% 13751 10111 7597
MILM8N
YELLOWSTONE R AT SIDNEY APR-SEP 12090 151% 15045 10680 7999
SIDM8N
BOULDER R AT BIG TIMBER APR-SEP 307 128% 402 280 240
BTMM8
BOULDER R AT BIG TIMBER APR-SEP 415 121% 509 386 342
BTMM8N
STILLWATER R NR ABSAROKEE APR-SEP 695 131% 806 617 532
SRAM8
STILLWATER R NR ABSAROKEE APR-SEP 757 128% 864 677 590
SRAM8N
CLARKS FK YELWSTONE R NR BELFRY APR-SEP 989 191% 1112 902 519
BFYM4
CLARKS FK YELWSTONE R NR BELFRY APR-SEP 1061 180% 1183 974 590
BFYM4N
BIGHORN R NR ST XAVIER APR-SEP 3453 139% 4378 2853 2477
STXM8N
LITTLE BIGHORN R NR HARDIN APR-SEP 150 147% 209 120 102
HRDM8N
TONGUE R NR DAYTON APR-SEP 96 100% 123 70 96
DAYW4N
TONGUE R NR DECKER APR-SEP 225 99% 328 170 227
DSLM8N
TONGUE R RESERVOIR INFLOW APR-SEP 234 103% 340 178 228
DKRM8N
POWDER R NR LOCATE APR-SEP 274 98% 500 196 280
MHDM8
POWDER R NR LOCATE APR-SEP 465 147% 969 381 316
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
