Supercell over Laramie
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Wyoming Snow Precipitation Update

United States Natural Resources Water and Climate Center Department of Conservation Portland, Oregon Agriculture Service S N O W - P R E C I P I T A T I O N U P D A T E Based on Mountain Data from NRCS SNOTEL Sites As of MONDAY: APRIL 26 , 2021 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 10.1 10.6 95 18.5 22.2 83 Blind Bull Sum 8650 20.1 24.2 83 13.6 20.8 65 Cottonwood Creek 7670 15.7 17.0 92 24.1 26.6 91 East Rim Divide 7930 .4 8.9 4 8.9 12.5 71 Grand Targhee 9260 38.1 43.3 88 29.6 33.5 88 Granite Creek 6770 10.5 9.3 113 16.3 20.7 79 Grassy Lake 7265 23.6 30.1 78 32.0 38.4 83 Gros Ventre Summit 8750 9.1 12.3 74 11.0 14.1 78 Gunsight Pass 9820 10.7 13.4 80 12.1 15.5 78 Lewis Lake Divide 7850 22.7 30.7 74 30.0 37.7 80 Loomis Park 8240 8.3 11.6 72 14.3 18.4 78 Phillips Bench 8200 19.9 25.5 78 24.2 29.9 81 Salt River Summit 7640 8.5 8.4 101 13.8 17.9 77 Snake River Station 6920 5.5 9.8 56 20.1 24.2 83 Somsen Ranch 6800 3.8 3.6 106 14.5 17.9 81 Spring Creek Divide 9000 21.9 23.9 92 22.9 25.5 90 Thumb Divide 7980 7.0 14.1 50 14.4 20.3 71 Togwotee Pass 9580 22.8 24.5 93 25.5 26.5 96 Triple Peak 8500 16.4 18.9 87 23.4 27.1 86 Two Ocean Plateau 9240 25.8 29.2 88 23.0 29.3 78 Willow Creek 8080 18.7 25.3 74 26.9 36.5 74 Younts Peak 8350 13.6 15.1 90 16.5 17.1 96 ----- ----- Basin Index (%) 81 82 MADISON HEADWATERS IN WYOMING Black Bear 8170 -M 37.0 * 32.0 40.9 78 Canyon 7870 12.1 11.6 104 14.1 17.5 81 Madison Plateau 7750 18.7 22.4 83 21.4 28.2 76 West Yellowstone 6700 2.2 4.7 47 -M 15.5 * Whiskey Creek 6800 12.6 15.4 82 18.1 21.8 83 ----- ----- Basin Index (%) 84 79 YELLOWSTONE HEADWATERS IN WYOMING Beartooth Lake 9360 21.4 23.5 91 21.0 21.3 99 Canyon 7870 12.1 11.6 104 14.1 17.5 81 Evening Star 9200 26.8 24.6 109 30.1 29.6 102 Fisher Creek 9100 31.0 33.2 93 34.7 34.3 101 Monument Peak 8850 22.5 20.6 109 26.2 23.6 111 Northeast Entrance 7350 1.7 4.9 35 15.3 13.4 114 Parker Peak 9400 24.0 21.8 110 24.0 19.4 124 Sylvan Lake 8420 13.6 20.3 67 23.0 24.3 95 Thumb Divide 7980 7.0 14.1 50 14.4 20.3 71 Two Ocean Plateau 9240 25.8 29.2 88 23.0 29.3 78 White Mill 8700 25.8 23.8 108 25.2 25.6 98 Wolverine 7650 6.1 5.2 117 16.8 13.3 126 ----- ----- Basin Index (%) 94 98 WIND RIVER Burroughs Creek 8750 10.4 -M * 16.2 -M * Castle Creek 8400 4.7 -M * 9.2 -M * Cold Springs 9630 6.6 2.7 244 11.3 11.7 97 Deer Park 9700 13.7 16.3 84 17.7 22.8 78 Hobbs Park 10100 14.6 15.7 93 15.8 15.9 99 Kirwin 9550 10.9 10.2 107 12.6 13.1 96 Little Warm 9370 9.8 9.4 104 13.7 14.6 94 South Pass 9040 13.4 15.2 88 15.1 19.6 77 St. Lawrence Alt 8620 2.8 4.6 61 8.0 10.9 73 Togwotee Pass 9580 22.8 24.5 93 25.5 26.5 96 Townsend Creek 8700 11.1 8.7 128 14.1 14.3 99 ----- ----- Basin Index (%) 99 90 BIGHORN BASIN Bald Mtn. 9380 18.8 20.5 92 17.7 18.9 94 Bear Trap Meadow 8200 8.8 1.7 518 12.8 10.0 128 Bone Springs Div 9350 18.7 16.4 114 14.1 17.4 81 Grave Springs 8550 8.1 9.2 88 10.2 12.3 83 Kirwin 9550 10.9 10.2 107 12.6 13.1 96 Marquette 8760 7.8 -M * 9.7 -M * Middle Powder 7760 13.9 12.2 114 12.3 13.5 91 Owl Creek 8975 6.1 2.3 265 8.4 7.4 114 Powder River Pass 9480 11.8 10.1 117 12.8 14.3 90 Shell Creek 9580 17.2 15.9 108 14.0 15.5 90 Timber Creek 7950 4.3 3.6 119 8.3 9.2 90 ----- ----- Basin Index (%) 116 94 SHOSHONE RIVER Blackwater 9780 21.6 24.6 88 23.2 22.7 102 Evening Star 9200 26.8 24.6 109 30.1 29.6 102 Marquette 8760 7.8 -M * 9.7 -M * Sylvan Lake 8420 13.6 20.3 67 23.0 24.3 95 Sylvan Road 7120 .1 7.9 1 14.2 18.0 79 Younts Peak 8350 13.6 15.1 90 16.5 17.1 96 ----- ----- Basin Index (%) 82 96 POWDER RIVER Bear Trap Meadow 8200 8.8 1.7 518 12.8 10.0 128 Cloud Peak Reservoir 9860 17.8 16.4 109 19.0 15.8 120 Grave Springs 8550 8.1 9.2 88 10.2 12.3 83 Hansen Sawmill 8360 11.0 4.1 268 12.9 10.3 125 Middle Powder 7760 13.9 12.2 114 12.3 13.5 91 Powder River Pass 9480 11.8 10.1 117 12.8 14.3 90 Soldier Park 8720 9.1 -M * 13.2 -M * ----- ----- Basin Index (%) 133 105 TONGUE RIVER Big Goose 7990 11.1 9.1 122 14.6 13.5 108 Bone Springs Div 9350 18.7 16.4 114 14.1 17.4 81 Burgess Junction 7880 13.6 12.4 110 16.0 14.1 113 Dome Lake 8880 14.0 11.8 119 16.2 15.6 104 Little Goose 8870 14.7 -M * 17.3 -M * Sucker Creek 8880 15.6 12.6 124 20.2 16.6 122 Tie Creek 6870 5.6 3.2 175 13.0 13.6 96 ----- ----- Basin Index (%) 120 104 BELLE FOURCHE Blind Park 6890 .5 3.2 16 10.8 13.7 79 Cole Canyon 5910 2.8 .6 467 9.6 11.0 87 North Rapid Creek 6130 4.6 3.1 148 10.6 11.7 91 ----- ----- Basin Index (%) 114 85 CHEYENNE RIVER BASIN Blind Park 6890 .5 3.2 16 10.8 13.7 79 North Rapid Creek 6130 4.6 3.1 148 10.6 11.7 91 ----- ----- Basin Index (%) 81 84 UPPER N. PLATTE Arapaho Ridge 10960 21.3 21.9 97 22.5 25.6 88 Blackhall Mtn 9820 28.5 -M * 28.7 -M * Cinnabar Park 9574 18.5 20.0 92 22.5 26.3 86 Columbine 9160 15.9 20.3 78 21.5 27.8 77 Divide Peak 8880 13.8 18.0 77 18.5 23.7 78 Joe Wright 10120 22.1 23.4 94 25.7 29.0 89 Laprele Creek 8375 9.7 7.2 135 13.5 14.5 93 Med Bow 10500 38.5 -M * 32.8 -M * Never Summer 10280 19.0 21.3 89 14.8 -M * North French Creek 10130 29.0 32.8 88 29.3 29.8 98 Old Battle 10000 29.2 34.3 85 30.6 38.2 80 Rawah 9020 8.2 8.0 102 14.7 16.7 88 Sage Creek Basin 7850 9.9 2.2 450 10.7 15.7 68 Sand Lake 10050 30.8 31.1 99 28.1 28.1 100 South Brush Creek 8440 4.8 10.0 48 11.2 17.2 65 Tower 10500 35.0 49.5 71 35.2 43.6 81 Webber Springs 9250 18.0 21.9 82 22.5 29.2 77 Whiskey Park 8950 24.7 25.6 96 26.8 30.7 87 Willow Creek Pass 9540 12.6 13.8 91 11.6 15.2 76 Zirkel 9340 17.1 22.1 77 27.5 30.4 90 ----- ----- Basin Index (%) 89 84 SWEETWATER Deer Park 9700 13.7 16.3 84 17.7 22.8 78 Larsen Creek 9000 4.0 9.7 41 10.7 -M * South Pass 9040 13.4 15.2 88 15.1 19.6 77 ----- ----- Basin Index (%) 75 77 LOWER N. PLATTE Casper Mtn. 7900 13.9 14.2 98 13.0 17.3 75 Laprele Creek 8375 9.7 7.2 135 13.5 14.5 93 Reno Hill 8400 16.2 13.7 118 17.9 18.1 99 Windy Peak 7900 12.1 5.8 209 14.2 12.5 114 ----- ----- Basin Index (%) 127 94 LARAMIE RIVER Brooklyn Lake 10240 24.2 22.9 106 27.6 23.9 115 Cinnabar Park 9574 18.5 20.0 92 22.5 26.3 86 Crow Creek 8330 4.1 .0 * 11.5 12.9 89 Deadman Hill 10220 20.7 18.3 113 19.0 20.0 95 Rawah 9020 8.2 8.0 102 14.7 16.7 88 Roach 9700 15.4 16.9 91 19.4 21.6 90 Windy Peak 7900 12.1 5.8 209 14.2 12.5 114 ----- ----- Basin Index (%) 112 96 S. PLATTE Crow Creek 8330 4.1 .0 * 11.5 12.9 89 ----- ----- Basin Index (%) * 89 LITTLE SNAKE RIVER Battle Mountain 7440 .2 1.6 12 12.3 16.7 74 Divide Peak 8880 13.8 18.0 77 18.5 23.7 78 Elk River 8700 11.3 14.4 78 13.5 22.1 61 Elkhead Divide 8780 12.6 -M * 17.5 -M * Little Snake River 8915 18.7 23.2 81 29.3 31.8 92 Old Battle 10000 29.2 34.3 85 30.6 38.2 80 Sage Creek Basin 7850 9.9 2.2 450 10.7 15.7 68 Sandstone RS 8150 4.0 8.2 49 14.3 20.2 71 Whiskey Park 8950 24.7 25.6 96 26.8 30.7 87 ----- ----- Basin Index (%) 88 78 UPPER GREEN RIVER Big Sandy Opening 9080 10.8 12.0 90 10.4 14.7 71 Blind Bull Sum 8650 20.1 24.2 83 13.6 20.8 65 East Rim Divide 7930 .4 8.9 4 8.9 12.5 71 Elkhart Park G.S. 9400 9.7 11.8 82 9.5 14.5 66 Gros Ventre Summit 8750 9.1 12.3 74 11.0 14.1 78 Gunsight Pass 9820 10.7 13.4 80 12.1 15.5 78 Indian Creek 9425 18.1 23.8 76 19.1 24.3 79 Kendall R.S. 7740 2.6 6.3 41 13.3 15.0 89 Larsen Creek 9000 4.0 9.7 41 10.7 -M * Loomis Park 8240 8.3 11.6 72 14.3 18.4 78 New Fork Lake 8340 5.6 7.2 78 10.7 11.6 92 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 -M 10.0 * -M 15.2 * Spring Creek Divide 9000 21.9 23.9 92 22.9 25.5 90 Triple Peak 8500 16.4 18.9 87 23.4 27.1 86 ----- ----- Basin Index (%) 75 79 LOWER GREEN RIVER Blacks Fork Jct 8869 4.0 -M * 10.7 -M * Buck Pasture 9632 10.0 -M * 15.0 -M * EF Blacks Fork GS 9360 9.8 -M * 11.6 -M * Hams Fork 7840 2.8 4.6 61 11.3 12.6 90 Henrys Fork 10182 -M -M * 13.2 -M * Hewinta 9500 7.9 6.5 122 14.0 15.6 90 Hickerson Park 9122 4.6 5.1 90 11.4 11.6 98 Hole-in-Rock 9168 5.8 4.6 126 11.7 11.1 105 Indian Creek 9425 18.1 23.8 76 19.1 24.3 79 Kelley R.S. 8180 10.2 11.8 86 14.9 19.6 76 Spirit Lk 10235 11.7 -M * 15.2 -M * Steel Creek Park 10158 14.6 16.6 88 17.1 18.5 92 ----- ----- Basin Index (%) 88 88 UPPER BEAR RIVER Bear River RS 8777 .5 -M * 11.3 -M * Bug Lake 7987 11.5 16.2 71 15.2 21.1 72 Burts Miller Ranch 8000 .1 -M * 7.5 -M * Chalk Creek #1 9171 14.6 24.7 59 18.6 27.7 67 Dry Bread Pond 8302 8.7 15.8 55 15.6 21.3 73 Giveout 6930 .0 .0 * 10.4 13.5 77 Hayden Fork 9130 5.6 10.4 54 18.8 23.1 81 Kelley R.S. 8180 10.2 11.8 86 14.9 19.6 76 Lily Lake 9133 8.6 9.8 88 12.4 19.0 65 Monte Cristo 8932 17.3 27.3 63 20.1 28.4 71 Salt River Summit 7640 8.5 8.4 101 13.8 17.9 77 Spring Creek Divide 9000 21.9 23.9 92 22.9 25.5 90 Trial Lake 9992 17.1 22.4 76 18.1 26.1 69 ----- ----- Basin Index (%) 73 74 ----------------------------------------------------------------------------- -M = Missing data * = Data may not provide a valid measure of conditions. Units = inches for the Current and Normal Snow Water Equivalent and Total Precipitation values If the Basin Index (%) value is flagged as potentially invalid, care should be taken to evaluate if the value is representative of conditions in the basin. The SNOW WATER EQUIVALENT Percent of Median represents the snow water equivalent found at selected SNOTEL sites in or near the basin compared to the Median value for those sites on this day. The TOTAL PRECIPITATION Percent of Average represents the total precipitation (beginning October 1st) found at selected SNOTEL sites in or near the basin compared to the Average value for those sites on this day. Contact your state water supply staff for assistance. Medians and averages are calculated for the period 1981-2010. Provisional data, subject to revision. * Site -- Either: (a) the current value is missing; (b) the median or average for the day is not available or is zero; or (c) for snow water equivalent, the median for the day is less than 10% of the maximum median value for the year. * Basin - More than half of the sites within the basin are flagged with *, preventing the calculation of a meaningful basin index. The basin index is calculated as the sum of the valid current values divided by the sum of the corresponding medians (for snow water equivalent) or averages (for precipitation) and the resulting fraction multiplied by 100. ---------------------------------------------------------------------------- -M = Missing data * = Data may not provide a valid measure of conditions. Units = inches for the Current and Normal Snow Water Equivalent and Total Precipitation values If the Basin Index (%) value is flagged as potentially invalid, care should be taken to evaluate if the value is representative of conditions in the basin. The SNOW WATER EQUIVALENT Percent of Median represents the snow water equivalent found at selected SNOTEL sites in or near the basin compared to the Median value for those sites on this day. The TOTAL PRECIPITATION Percent of Average represents the total precipitation (beginning October 1st) found at selected SNOTEL sites in or near the basin compared to the Average value for those sites on this day. Contact your state water supply staff for assistance. Medians and averages are calculated for the period 1981-2010. Provisional data, subject to revision. * Site -- Either: (a) the current value is missing; (b) the median or average for the day is not available or is zero; or (c) for snow water equivalent, the median for the day is less than 10% of the maximum median value for the year. * Basin - More than half of the sites within the basin are flagged with *, preventing the calculation of a meaningful basin index. The basin index is calculated as the sum of the valid current values divided by the sum of the corresponding medians (for snow water equivalent) or averages (for precipitation) and the resulting fraction multiplied by 100.