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 TUESDAY: APRIL 20 , 2021 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 14.2 11.9 119 18.3 21.7 84 Blind Bull Sum 8650 19.6 24.0 82 13.3 20.2 66 Cottonwood Creek 7670 16.9 18.6 91 23.6 25.8 91 East Rim Divide 7930 2.5 9.5 26 8.7 12.2 71 Grand Targhee 9260 37.0 42.0 88 28.8 32.6 88 Granite Creek 6770 12.7 10.8 118 15.7 20.3 77 Grassy Lake 7265 24.5 31.3 78 31.2 37.3 84 Gros Ventre Summit 8750 9.5 13.2 72 10.8 13.7 79 Gunsight Pass 9820 11.3 13.6 83 11.3 14.9 76 Lewis Lake Divide 7850 23.9 30.4 79 29.2 36.8 79 Loomis Park 8240 10.3 13.0 79 13.8 18.0 77 Phillips Bench 8200 20.6 25.6 80 23.7 29.2 81 Salt River Summit 7640 10.1 9.7 104 13.3 17.4 76 Snake River Station 6920 9.8 11.3 87 19.5 23.5 83 Somsen Ranch 6800 6.0 6.5 92 13.9 17.4 80 Spring Creek Divide 9000 21.4 23.5 91 22.4 24.7 91 Thumb Divide 7980 10.2 14.5 70 14.0 19.7 71 Togwotee Pass 9580 22.7 23.8 95 25.1 25.7 98 Triple Peak 8500 17.8 19.3 92 22.4 26.3 85 Two Ocean Plateau 9240 25.7 28.1 91 22.0 28.5 77 Willow Creek 8080 19.8 26.8 74 26.2 35.3 74 Younts Peak 8350 13.1 15.1 87 15.7 16.6 95 ----- ----- Basin Index (%) 85 82 MADISON HEADWATERS IN WYOMING Black Bear 8170 -M 36.9 * 31.0 39.8 78 Canyon 7870 12.6 12.2 103 13.9 17.0 82 Madison Plateau 7750 20.1 22.9 88 20.9 27.5 76 West Yellowstone 6700 6.6 7.4 89 13.3 15.1 88 Whiskey Creek 6800 13.2 15.3 86 17.6 21.2 83 ----- ----- Basin Index (%) 91 80 YELLOWSTONE HEADWATERS IN WYOMING Beartooth Lake 9360 21.1 23.4 90 20.6 20.8 99 Canyon 7870 12.6 12.2 103 13.9 17.0 82 Evening Star 9200 26.6 24.8 107 29.7 28.7 103 Fisher Creek 9100 29.1 32.4 90 32.7 33.3 98 Monument Peak 8850 21.5 20.7 104 25.0 22.9 109 Northeast Entrance 7350 3.8 6.7 57 15.0 13.0 115 Parker Peak 9400 25.1 20.9 120 23.5 18.7 126 Sylvan Lake 8420 16.0 20.4 78 22.5 23.6 95 Thumb Divide 7980 10.2 14.5 70 14.0 19.7 71 Two Ocean Plateau 9240 25.7 28.1 91 22.0 28.5 77 White Mill 8700 25.4 23.7 107 24.3 24.9 98 Wolverine 7650 7.8 7.2 108 16.4 12.8 128 ----- ----- Basin Index (%) 96 98 WIND RIVER Burroughs Creek 8750 10.3 -M * 15.3 -M * Castle Creek 8400 4.5 -M * 8.7 -M * Cold Springs 9630 6.6 4.6 143 10.5 10.9 96 Deer Park 9700 13.3 16.3 82 16.9 21.5 79 Hobbs Park 10100 13.6 14.8 92 14.8 14.8 100 Kirwin 9550 10.2 10.0 102 11.8 12.4 95 Little Warm 9370 9.1 10.1 90 12.8 13.9 92 South Pass 9040 13.3 15.5 86 14.6 18.6 78 St. Lawrence Alt 8620 3.0 5.3 57 7.7 9.9 78 Togwotee Pass 9580 22.7 23.8 95 25.1 25.7 98 Townsend Creek 8700 10.9 9.4 116 13.6 13.3 102 ----- ----- Basin Index (%) 94 91 BIGHORN BASIN Bald Mtn. 9380 18.0 19.8 91 15.7 18.2 86 Bear Trap Meadow 8200 8.8 3.2 275 12.5 9.4 133 Bone Springs Div 9350 17.3 16.1 107 13.0 16.7 78 Grave Springs 8550 8.1 9.6 84 10.0 11.7 85 Kirwin 9550 10.2 10.0 102 11.8 12.4 95 Marquette 8760 7.2 -M * 9.1 -M * Middle Powder 7760 13.7 12.5 110 12.0 12.8 94 Owl Creek 8975 6.2 4.0 155 7.7 6.9 112 Powder River Pass 9480 11.8 10.2 116 12.4 13.7 91 Shell Creek 9580 16.4 15.4 106 13.5 14.8 91 Timber Creek 7950 3.9 4.8 81 8.2 8.4 98 ----- ----- Basin Index (%) 108 93 SHOSHONE RIVER Blackwater 9780 20.8 23.8 87 22.6 21.8 104 Evening Star 9200 26.6 24.8 107 29.7 28.7 103 Marquette 8760 7.2 -M * 9.1 -M * Sylvan Lake 8420 16.0 20.4 78 22.5 23.6 95 Sylvan Road 7120 .8 9.8 8 -M 17.6 * Younts Peak 8350 13.1 15.1 87 15.7 16.6 95 ----- ----- Basin Index (%) 82 100 POWDER RIVER Bear Trap Meadow 8200 8.8 3.2 275 12.5 9.4 133 Cloud Peak Reservoir 9860 17.6 15.8 111 18.4 14.9 123 Grave Springs 8550 8.1 9.6 84 10.0 11.7 85 Hansen Sawmill 8360 10.6 4.8 221 12.4 9.5 131 Middle Powder 7760 13.7 12.5 110 12.0 12.8 94 Powder River Pass 9480 11.8 10.2 116 12.4 13.7 91 Soldier Park 8720 8.8 -M * 12.7 -M * ----- ----- Basin Index (%) 126 108 TONGUE RIVER Big Goose 7990 10.8 9.3 116 14.4 12.6 114 Bone Springs Div 9350 17.3 16.1 107 13.0 16.7 78 Burgess Junction 7880 13.3 12.5 106 15.4 13.4 115 Dome Lake 8880 14.1 11.8 119 15.5 14.9 104 Little Goose 8870 14.3 -M * 16.7 -M * Sucker Creek 8880 15.1 12.7 119 19.3 15.8 122 Tie Creek 6870 5.5 4.4 125 12.4 12.8 97 ----- ----- Basin Index (%) 114 104 BELLE FOURCHE Blind Park 6890 1.3 4.1 32 10.4 13.1 79 Cole Canyon 5910 3.0 2.0 150 9.2 10.4 88 North Rapid Creek 6130 4.9 4.2 117 10.3 11.0 94 ----- ----- Basin Index (%) 89 87 CHEYENNE RIVER BASIN Blind Park 6890 1.3 4.1 32 10.4 13.1 79 North Rapid Creek 6130 4.9 4.2 117 10.3 11.0 94 ----- ----- Basin Index (%) 75 86 UPPER N. PLATTE Arapaho Ridge 10960 20.7 21.4 97 21.6 24.3 89 Blackhall Mtn 9820 27.7 -M * 28.4 -M * Cinnabar Park 9574 18.4 20.1 92 22.2 25.3 88 Columbine 9160 16.6 20.6 81 20.6 26.9 77 Divide Peak 8880 14.3 18.9 76 18.2 22.8 80 Joe Wright 10120 20.4 22.2 92 24.9 27.7 90 Laprele Creek 8375 10.0 8.0 125 13.3 13.7 97 Med Bow 10500 37.7 -M * 32.6 -M * Never Summer 10280 18.7 20.7 90 14.1 -M * North French Creek 10130 28.5 32.0 89 29.1 28.6 102 Old Battle 10000 29.0 32.7 89 29.9 37.0 81 Rawah 9020 8.2 8.4 98 14.5 15.5 94 Sage Creek Basin 7850 13.7 6.0 228 10.6 15.3 69 Sand Lake 10050 30.2 30.5 99 27.6 26.8 103 South Brush Creek 8440 6.1 9.8 62 10.8 16.5 65 Tower 10500 34.8 48.0 72 34.5 42.1 82 Webber Springs 9250 17.8 22.0 81 21.8 28.4 77 Whiskey Park 8950 25.1 25.9 97 26.6 29.6 90 Willow Creek Pass 9540 12.4 13.1 95 10.9 14.4 76 Zirkel 9340 17.3 22.7 76 -M 29.7 * ----- ----- Basin Index (%) 89 85 SWEETWATER Deer Park 9700 13.3 16.3 82 16.9 21.5 79 Larsen Creek 9000 4.4 10.3 43 9.8 -M * South Pass 9040 13.3 15.5 86 14.6 18.6 78 ----- ----- Basin Index (%) 74 79 LOWER N. PLATTE Casper Mtn. 7900 14.2 14.4 99 12.8 16.6 77 Laprele Creek 8375 10.0 8.0 125 13.3 13.7 97 Reno Hill 8400 16.1 13.9 116 18.1 17.2 105 Windy Peak 7900 11.7 6.6 177 13.8 11.6 119 ----- ----- Basin Index (%) 121 98 LARAMIE RIVER Brooklyn Lake 10240 24.0 22.2 108 27.3 22.8 120 Cinnabar Park 9574 18.4 20.1 92 22.2 25.3 88 Crow Creek 8330 4.6 .7 657* 11.1 12.0 92 Deadman Hill 10220 20.1 17.0 118 18.7 18.9 99 Rawah 9020 8.2 8.4 98 14.5 15.5 94 Roach 9700 15.0 16.6 90 18.8 20.6 91 Windy Peak 7900 11.7 6.6 177 13.8 11.6 119 ----- ----- Basin Index (%) 111 100 S. PLATTE Crow Creek 8330 4.6 .7 657* 11.1 12.0 92 ----- ----- Basin Index (%) 657* 92 LITTLE SNAKE RIVER Battle Mountain 7440 2.2 4.3 51 11.9 16.1 74 Divide Peak 8880 14.3 18.9 76 18.2 22.8 80 Elk River 8700 12.6 15.5 81 13.1 21.3 62 Elkhead Divide 8780 13.0 -M * 17.1 -M * Little Snake River 8915 19.8 24.3 81 28.8 31.2 92 Old Battle 10000 29.0 32.7 89 29.9 37.0 81 Sage Creek Basin 7850 13.7 6.0 228 10.6 15.3 69 Sandstone RS 8150 7.3 10.1 72 14.0 19.5 72 Whiskey Park 8950 25.1 25.9 97 26.6 29.6 90 ----- ----- Basin Index (%) 90 79 UPPER GREEN RIVER Big Sandy Opening 9080 10.3 12.7 81 9.9 14.1 70 Blind Bull Sum 8650 19.6 24.0 82 13.3 20.2 66 East Rim Divide 7930 2.5 9.5 26 8.7 12.2 71 Elkhart Park G.S. 9400 8.9 11.9 75 9.0 14.0 64 Gros Ventre Summit 8750 9.5 13.2 72 10.8 13.7 79 Gunsight Pass 9820 11.3 13.6 83 11.3 14.9 76 Indian Creek 9425 18.4 23.3 79 18.4 23.5 78 Kendall R.S. 7740 6.9 8.4 82 12.9 14.8 87 Larsen Creek 9000 4.4 10.3 43 9.8 -M * Loomis Park 8240 10.3 13.0 79 13.8 18.0 77 New Fork Lake 8340 6.8 8.8 77 10.1 11.3 89 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 -M 10.7 * -M 14.8 * Spring Creek Divide 9000 21.4 23.5 91 22.4 24.7 91 Triple Peak 8500 17.8 19.3 92 22.4 26.3 85 ----- ----- Basin Index (%) 77 78 LOWER GREEN RIVER Blacks Fork Jct 8869 4.8 -M * 10.5 -M * Buck Pasture 9632 10.5 -M * 14.8 -M * EF Blacks Fork GS 9360 10.7 -M * 11.4 -M * Hams Fork 7840 6.0 6.7 90 10.6 12.0 88 Henrys Fork 10182 -M -M * 12.8 -M * Hewinta 9500 8.8 8.1 109 13.3 15.0 89 Hickerson Park 9122 6.1 5.4 113 11.4 11.0 104 Hole-in-Rock 9168 6.5 5.9 110 11.3 10.5 108 Indian Creek 9425 18.4 23.3 79 18.4 23.5 78 Kelley R.S. 8180 11.3 12.7 89 14.5 18.9 77 Spirit Lk 10235 11.7 -M * 15.0 -M * Steel Creek Park 10158 14.4 16.2 89 16.9 17.7 95 ----- ----- Basin Index (%) 91 89 UPPER BEAR RIVER Bear River RS 8777 3.1 -M * 11.3 -M * Bug Lake 7987 13.2 17.2 77 15.0 20.4 74 Burts Miller Ranch 8000 .3 -M * 7.4 -M * Chalk Creek #1 9171 -M 24.6 * -M 26.7 * Dry Bread Pond 8302 12.4 16.2 77 15.4 20.6 75 Giveout 6930 .0 2.5 0 10.3 13.0 79 Hayden Fork 9130 8.0 11.8 68 18.6 22.4 83 Kelley R.S. 8180 11.3 12.7 89 14.5 18.9 77 Lily Lake 9133 9.7 10.6 92 12.4 18.3 68 Monte Cristo 8932 18.4 27.5 67 20.0 27.3 73 Salt River Summit 7640 10.1 9.7 104 13.3 17.4 76 Spring Creek Divide 9000 21.4 23.5 91 22.4 24.7 91 Trial Lake 9992 16.8 21.3 79 17.9 25.3 71 ----- ----- Basin Index (%) 79 77 ----------------------------------------------------------------------------- -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.