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 5 , 2021 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 15.1 15.2 99 17.8 20.5 87 Blind Bull Sum 8650 19.6 23.1 85 13.1 19.2 68 Cottonwood Creek 7670 19.5 21.1 92 23.0 24.2 95 East Rim Divide 7930 7.4 10.2 73 8.3 11.5 72 Grand Targhee 9260 35.1 37.9 93 28.0 30.4 92 Granite Creek 6770 14.9 14.7 101 15.7 19.4 81 Grassy Lake 7265 27.4 31.6 87 30.6 35.3 87 Gros Ventre Summit 8750 9.4 13.0 72 9.9 12.7 78 Gunsight Pass 9820 10.6 13.6 78 10.7 13.5 79 Lewis Lake Divide 7850 23.1 29.7 78 28.7 34.7 83 Loomis Park 8240 10.8 13.9 78 13.2 17.0 78 Phillips Bench 8200 22.0 24.9 88 23.4 27.6 85 Salt River Summit 7640 9.9 12.9 77 12.5 16.4 76 Snake River Station 6920 14.2 15.0 95 19.2 22.0 87 Somsen Ranch 6800 9.5 11.0 86 13.3 16.3 82 Spring Creek Divide 9000 21.2 22.5 94 21.5 23.4 92 Thumb Divide 7980 11.9 14.7 81 13.4 18.2 74 Togwotee Pass 9580 19.4 21.9 89 23.9 23.8 100 Triple Peak 8500 20.4 21.9 93 21.9 24.9 88 Two Ocean Plateau 9240 24.6 25.8 95 14.3 26.6 54 Willow Creek 8080 22.6 28.3 80 25.6 33.0 78 Younts Peak 8350 13.6 14.3 95 15.2 15.4 99 ----- ----- Basin Index (%) 87 83 MADISON HEADWATERS IN WYOMING Black Bear 8170 25.7 37.1 69 29.8 37.4 80 Canyon 7870 12.3 12.5 98 13.8 15.9 87 Madison Plateau 7750 19.8 21.4 93 19.9 25.8 77 West Yellowstone 6700 9.6 9.9 97 12.6 13.9 91 Whiskey Creek 6800 13.5 14.9 91 17.0 19.7 86 ----- ----- Basin Index (%) 84 83 YELLOWSTONE HEADWATERS IN WYOMING Beartooth Lake 9360 20.3 21.2 96 20.0 19.3 104 Canyon 7870 12.3 12.5 98 13.8 15.9 87 Evening Star 9200 25.6 23.8 108 28.4 26.7 106 Fisher Creek 9100 29.1 30.9 94 31.7 31.0 102 Monument Peak 8850 20.6 19.4 106 23.6 21.2 111 Northeast Entrance 7350 -M 9.2 * -M 11.9 * Parker Peak 9400 23.0 19.2 120 22.9 17.2 133 Sylvan Lake 8420 16.7 19.3 87 21.9 21.8 100 Thumb Divide 7980 11.9 14.7 81 13.4 18.2 74 Two Ocean Plateau 9240 24.6 25.8 95 14.3 26.6 54 White Mill 8700 24.7 22.0 112 23.7 23.2 102 Wolverine 7650 9.1 9.4 97 15.4 11.9 129 ----- ----- Basin Index (%) 100 98 WIND RIVER Burroughs Creek 8750 9.4 -M * 14.1 -M * Castle Creek 8400 4.7 -M * 7.3 -M * Cold Springs 9630 5.8 6.9 84 9.0 9.8 92 Deer Park 9700 11.6 15.2 76 15.0 19.4 77 Hobbs Park 10100 11.6 13.9 83 12.4 13.2 94 Kirwin 9550 8.2 9.6 85 10.6 11.3 94 Little Warm 9370 9.3 10.2 91 12.2 12.6 97 South Pass 9040 11.4 15.1 75 13.1 17.1 77 St. Lawrence Alt 8620 2.3 6.8 34 5.8 8.8 66 Togwotee Pass 9580 19.4 21.9 89 23.9 23.8 100 Townsend Creek 8700 8.7 9.4 93 11.0 11.8 93 ----- ----- Basin Index (%) 81 88 BIGHORN BASIN Bald Mtn. 9380 16.2 19.0 85 15.4 16.6 93 Bear Trap Meadow 8200 8.4 5.0 168 10.5 8.3 127 Bone Springs Div 9350 15.3 16.6 92 11.9 15.2 78 Grave Springs 8550 7.1 9.2 77 8.5 10.3 83 Kirwin 9550 8.2 9.6 85 10.6 11.3 94 Marquette 8760 4.2 -M * 6.9 -M * Middle Powder 7760 11.1 11.8 94 9.8 11.4 86 Owl Creek 8975 4.8 5.8 83 5.9 5.9 100 Powder River Pass 9480 11.0 10.1 109 10.8 12.3 88 Shell Creek 9580 -M 14.8 * -M 13.5 * Timber Creek 7950 2.9 4.9 59 5.0 7.2 69 ----- ----- Basin Index (%) 92 90 SHOSHONE RIVER Blackwater 9780 19.6 22.4 88 21.9 20.1 109 Evening Star 9200 25.6 23.8 108 28.4 26.7 106 Marquette 8760 4.2 -M * 6.9 -M * Sylvan Lake 8420 16.7 19.3 87 21.9 21.8 100 Sylvan Road 7120 7.5 10.9 69 -M 16.4 * Younts Peak 8350 13.6 14.3 95 15.2 15.4 99 ----- ----- Basin Index (%) 92 104 POWDER RIVER Bear Trap Meadow 8200 8.4 5.0 168 10.5 8.3 127 Cloud Peak Reservoir 9860 15.8 14.6 108 15.7 13.0 121 Grave Springs 8550 7.1 9.2 77 8.5 10.3 83 Hansen Sawmill 8360 9.0 6.2 145 10.4 8.4 124 Middle Powder 7760 11.1 11.8 94 9.8 11.4 86 Powder River Pass 9480 11.0 10.1 109 10.8 12.3 88 Soldier Park 8720 7.2 -M * 10.8 -M * ----- ----- Basin Index (%) 110 103 TONGUE RIVER Big Goose 7990 8.9 9.4 95 11.9 11.2 106 Bone Springs Div 9350 15.3 16.6 92 11.9 15.2 78 Burgess Junction 7880 10.7 11.7 91 13.1 12.1 108 Dome Lake 8880 12.6 11.7 108 13.4 13.3 101 Little Goose 8870 11.7 -M * 13.9 -M * Sucker Creek 8880 13.2 11.9 111 17.0 14.1 121 Tie Creek 6870 4.5 5.5 82 10.5 11.4 92 ----- ----- Basin Index (%) 98 101 BELLE FOURCHE Blind Park 6890 1.7 7.1 24 8.4 11.6 72 Cole Canyon 5910 2.1 5.5 38 6.7 9.2 73 North Rapid Creek 6130 4.4 6.7 66 7.8 9.6 81 ----- ----- Basin Index (%) 42 75 CHEYENNE RIVER BASIN Blind Park 6890 1.7 7.1 24 8.4 11.6 72 North Rapid Creek 6130 4.4 6.7 66 7.8 9.6 81 ----- ----- Basin Index (%) 44 76 UPPER N. PLATTE Arapaho Ridge 10960 20.5 20.6 100 20.3 22.0 92 Blackhall Mtn 9820 27.6 -M * 27.0 -M * Cinnabar Park 9574 17.8 20.9 85 20.7 23.8 87 Columbine 9160 20.1 23.3 86 19.9 25.1 79 Divide Peak 8880 15.1 19.8 76 17.5 21.1 83 Joe Wright 10120 19.2 20.8 92 22.5 25.4 89 Laprele Creek 8375 10.1 9.4 107 12.4 12.3 101 Med Bow 10500 36.9 -M * 31.4 -M * Never Summer 10280 16.9 20.2 84 13.0 -M * North French Creek 10130 27.7 29.0 96 27.5 26.3 105 Old Battle 10000 28.1 30.9 91 29.6 34.4 86 Rawah 9020 10.3 10.5 98 13.4 13.9 96 Sage Creek Basin 7850 16.3 12.4 131 10.0 14.2 70 Sand Lake 10050 28.9 28.5 101 26.4 24.3 109 South Brush Creek 8440 8.4 12.0 70 10.3 15.0 69 Tower 10500 33.9 45.3 75 32.9 39.2 84 Webber Springs 9250 18.7 23.0 81 21.2 26.3 81 Whiskey Park 8950 28.0 27.1 103 25.9 27.4 95 Willow Creek Pass 9540 11.5 12.0 96 10.3 13.2 78 Zirkel 9340 20.0 26.3 76 -M 27.9 * ----- ----- Basin Index (%) 90 88 SWEETWATER Deer Park 9700 11.6 15.2 76 15.0 19.4 77 Larsen Creek 9000 6.3 11.8 53 8.9 -M * South Pass 9040 11.4 15.1 75 13.1 17.1 77 ----- ----- Basin Index (%) 70 77 LOWER N. PLATTE Casper Mtn. 7900 12.7 14.2 89 11.2 14.6 77 Laprele Creek 8375 10.1 9.4 107 12.4 12.3 101 Reno Hill 8400 14.6 13.9 105 15.8 15.1 105 Windy Peak 7900 11.5 7.8 147 13.0 10.3 126 ----- ----- Basin Index (%) 108 100 LARAMIE RIVER Brooklyn Lake 10240 24.1 21.3 113 25.6 20.8 123 Cinnabar Park 9574 17.8 20.9 85 20.7 23.8 87 Crow Creek 8330 4.6 7.0 66 10.0 10.6 94 Deadman Hill 10220 18.9 15.9 119 17.5 17.0 103 Rawah 9020 10.3 10.5 98 13.4 13.9 96 Roach 9700 15.0 16.3 92 17.2 18.9 91 Windy Peak 7900 11.5 7.8 147 13.0 10.3 126 ----- ----- Basin Index (%) 103 102 S. PLATTE Crow Creek 8330 4.6 7.0 66 10.0 10.6 94 ----- ----- Basin Index (%) 66 94 LITTLE SNAKE RIVER Battle Mountain 7440 7.2 10.1 71 12.4 14.8 84 Divide Peak 8880 15.1 19.8 76 17.5 21.1 83 Elk River 8700 14.2 19.1 74 12.8 19.7 65 Elkhead Divide 8780 14.3 -M * 16.7 -M * Little Snake River 8915 21.0 24.6 85 28.5 29.1 98 Old Battle 10000 28.1 30.9 91 29.6 34.4 86 Sage Creek Basin 7850 16.3 12.4 131 10.0 14.2 70 Sandstone RS 8150 10.1 12.8 79 13.8 18.0 77 Whiskey Park 8950 28.0 27.1 103 25.9 27.4 95 ----- ----- Basin Index (%) 89 84 UPPER GREEN RIVER Big Sandy Opening 9080 9.2 12.5 74 8.5 13.0 65 Blind Bull Sum 8650 19.6 23.1 85 13.1 19.2 68 East Rim Divide 7930 7.4 10.2 73 8.3 11.5 72 Elkhart Park G.S. 9400 9.2 12.2 75 8.2 13.0 63 Gros Ventre Summit 8750 9.4 13.0 72 9.9 12.7 78 Gunsight Pass 9820 10.6 13.6 78 10.7 13.5 79 Indian Creek 9425 17.8 24.5 73 17.0 22.2 77 Kendall R.S. 7740 9.8 11.5 85 12.3 14.0 88 Larsen Creek 9000 6.3 11.8 53 8.9 -M * Loomis Park 8240 10.8 13.9 78 13.2 17.0 78 New Fork Lake 8340 8.0 10.3 78 9.5 10.6 90 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 9.8 12.3 80 12.6 14.0 90 Spring Creek Divide 9000 21.2 22.5 94 21.5 23.4 92 Triple Peak 8500 20.4 21.9 93 21.9 24.9 88 ----- ----- Basin Index (%) 79 80 LOWER GREEN RIVER Blacks Fork Jct 8869 6.5 -M * 10.0 -M * Buck Pasture 9632 12.3 -M * 13.8 -M * EF Blacks Fork GS 9360 11.8 -M * 11.0 -M * Hams Fork 7840 8.3 10.9 76 9.8 11.2 88 Henrys Fork 10182 -M -M * 11.9 -M * Hewinta 9500 10.8 11.0 98 12.9 13.8 93 Hickerson Park 9122 8.7 7.8 112 10.7 10.1 106 Hole-in-Rock 9168 6.8 7.0 97 10.9 9.5 115 Indian Creek 9425 17.8 24.5 73 17.0 22.2 77 Kelley R.S. 8180 11.8 14.9 79 13.7 17.8 77 Spirit Lk 10235 12.2 -M * 14.3 -M * Steel Creek Park 10158 14.6 15.6 94 16.1 16.2 99 ----- ----- Basin Index (%) 86 90 UPPER BEAR RIVER Bear River RS 8777 6.5 -M * 10.6 -M * Bug Lake 7987 12.6 18.3 69 13.8 19.1 72 Burts Miller Ranch 8000 4.9 -M * 7.4 -M * Chalk Creek #1 9171 15.0 24.1 62 16.8 24.8 68 Dry Bread Pond 8302 11.5 18.2 63 14.3 19.2 74 Giveout 6930 5.0 8.5 59 9.5 12.2 78 Hayden Fork 9130 10.2 15.4 66 17.4 20.7 84 Kelley R.S. 8180 11.8 14.9 79 13.7 17.8 77 Lily Lake 9133 9.1 12.5 73 11.5 16.8 68 Monte Cristo 8932 16.9 27.4 62 18.1 25.5 71 Salt River Summit 7640 9.9 12.9 77 12.5 16.4 76 Spring Creek Divide 9000 21.2 22.5 94 21.5 23.4 92 Trial Lake 9992 16.6 21.6 77 16.1 23.6 68 ----- ----- Basin Index (%) 71 75 ----------------------------------------------------------------------------- -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.