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 SUNDAY: APRIL 18 , 2021 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 13.7 12.2 112 18.3 21.6 85 Blind Bull Sum 8650 19.5 23.9 82 13.3 20.1 66 Cottonwood Creek 7670 17.1 19.1 90 23.5 25.5 92 East Rim Divide 7930 3.5 9.6 36 8.8 12.1 73 Grand Targhee 9260 36.8 41.7 88 28.9 32.3 89 Granite Creek 6770 12.6 11.4 111 15.7 20.2 78 Grassy Lake 7265 25.9 31.5 82 31.2 37.1 84 Gros Ventre Summit 8750 9.8 13.2 74 10.7 13.5 79 Gunsight Pass 9820 11.0 13.5 81 11.5 14.6 79 Lewis Lake Divide 7850 23.8 30.2 79 29.4 36.5 81 Loomis Park 8240 9.6 13.2 73 13.8 17.8 78 Phillips Bench 8200 21.3 25.8 83 23.7 28.9 82 Salt River Summit 7640 10.3 10.3 100 13.4 17.2 78 Snake River Station 6920 10.9 11.7 93 19.6 23.3 84 Somsen Ranch 6800 7.2 7.4 97 14.0 17.2 81 Spring Creek Divide 9000 21.4 23.5 91 22.4 24.6 91 Thumb Divide 7980 10.3 14.5 71 14.2 19.5 73 Togwotee Pass 9580 22.8 23.5 97 25.0 25.4 98 Triple Peak 8500 18.2 19.3 94 22.5 26.1 86 Two Ocean Plateau 9240 25.9 27.8 93 22.2 28.2 79 Willow Creek 8080 20.8 26.8 78 26.1 34.9 75 Younts Peak 8350 13.4 15.0 89 15.8 16.4 96 ----- ----- Basin Index (%) 86 83 MADISON HEADWATERS IN WYOMING Black Bear 8170 -M 36.8 * 31.1 39.5 79 Canyon 7870 12.6 12.4 102 14.0 16.8 83 Madison Plateau 7750 19.3 22.8 85 20.9 27.2 77 West Yellowstone 6700 7.1 8.0 89 13.2 14.9 89 Whiskey Creek 6800 13.5 15.1 89 17.6 21.0 84 ----- ----- Basin Index (%) 90 81 YELLOWSTONE HEADWATERS IN WYOMING Beartooth Lake 9360 21.0 23.0 91 20.6 20.5 100 Canyon 7870 12.6 12.4 102 14.0 16.8 83 Evening Star 9200 26.7 25.0 107 29.6 28.4 104 Fisher Creek 9100 29.0 32.2 90 32.7 33.0 99 Monument Peak 8850 21.5 20.8 103 24.9 22.7 110 Northeast Entrance 7350 4.6 7.3 63 15.0 12.8 117 Parker Peak 9400 25.0 20.8 120 23.6 18.5 128 Sylvan Lake 8420 15.9 20.3 78 22.6 23.3 97 Thumb Divide 7980 10.3 14.5 71 14.2 19.5 73 Two Ocean Plateau 9240 25.9 27.8 93 22.2 28.2 79 White Mill 8700 25.3 23.6 107 24.4 24.7 99 Wolverine 7650 8.4 7.8 108 16.4 12.7 129 ----- ----- Basin Index (%) 96 100 WIND RIVER Burroughs Creek 8750 9.7 -M * 15.1 -M * Castle Creek 8400 4.5 -M * 8.3 -M * Cold Springs 9630 6.5 5.1 127 10.4 10.7 97 Deer Park 9700 13.0 16.1 81 16.6 21.1 79 Hobbs Park 10100 13.2 14.8 89 14.4 14.5 99 Kirwin 9550 10.0 10.0 100 11.9 12.2 98 Little Warm 9370 9.1 10.2 89 12.7 13.7 93 South Pass 9040 13.0 15.7 83 14.6 18.3 80 St. Lawrence Alt 8620 2.7 5.7 47 7.4 9.7 76 Togwotee Pass 9580 22.8 23.5 97 25.0 25.4 98 Townsend Creek 8700 10.5 9.7 108 13.2 13.0 102 ----- ----- Basin Index (%) 91 91 BIGHORN BASIN Bald Mtn. 9380 17.9 19.6 91 16.4 17.9 92 Bear Trap Meadow 8200 8.3 3.8 218 11.9 9.2 129 Bone Springs Div 9350 17.1 16.3 105 13.0 16.5 79 Grave Springs 8550 8.0 9.7 82 9.7 11.3 86 Kirwin 9550 10.0 10.0 100 11.9 12.2 98 Marquette 8760 6.9 -M * 9.0 -M * Middle Powder 7760 13.4 12.5 107 11.6 12.5 93 Owl Creek 8975 6.1 4.4 139 7.6 6.6 115 Powder River Pass 9480 10.6 10.1 105 11.6 13.5 86 Shell Creek 9580 15.7 15.3 103 12.7 14.6 87 Timber Creek 7950 3.7 5.1 73 7.6 8.2 93 ----- ----- Basin Index (%) 104 93 SHOSHONE RIVER Blackwater 9780 20.8 23.8 87 22.8 21.6 106 Evening Star 9200 26.7 25.0 107 29.6 28.4 104 Marquette 8760 6.9 -M * 9.0 -M * Sylvan Lake 8420 15.9 20.3 78 22.6 23.3 97 Sylvan Road 7120 2.1 10.2 21 -M 17.4 * Younts Peak 8350 13.4 15.0 89 15.8 16.4 96 ----- ----- Basin Index (%) 84 101 POWDER RIVER Bear Trap Meadow 8200 8.3 3.8 218 11.9 9.2 129 Cloud Peak Reservoir 9860 16.6 15.6 106 17.5 14.5 121 Grave Springs 8550 8.0 9.7 82 9.7 11.3 86 Hansen Sawmill 8360 9.7 5.2 187 11.4 9.3 123 Middle Powder 7760 13.4 12.5 107 11.6 12.5 93 Powder River Pass 9480 10.6 10.1 105 11.6 13.5 86 Soldier Park 8720 8.1 -M * 11.9 -M * ----- ----- Basin Index (%) 117 105 TONGUE RIVER Big Goose 7990 10.0 9.5 105 13.4 12.3 109 Bone Springs Div 9350 17.1 16.3 105 13.0 16.5 79 Burgess Junction 7880 12.9 12.3 105 14.9 13.2 113 Dome Lake 8880 13.4 11.9 113 14.8 14.6 101 Little Goose 8870 13.1 -M * 15.7 -M * Sucker Creek 8880 14.6 12.7 115 18.8 15.5 121 Tie Creek 6870 5.1 4.5 113 11.8 12.6 94 ----- ----- Basin Index (%) 109 102 BELLE FOURCHE Blind Park 6890 1.1 4.4 25 9.8 12.6 78 Cole Canyon 5910 2.7 2.4 112 8.5 10.1 84 North Rapid Creek 6130 4.6 4.6 100 9.7 10.5 92 ----- ----- Basin Index (%) 74 84 CHEYENNE RIVER BASIN Blind Park 6890 1.1 4.4 25 9.8 12.6 78 North Rapid Creek 6130 4.6 4.6 100 9.7 10.5 92 ----- ----- Basin Index (%) 63 84 UPPER N. PLATTE Arapaho Ridge 10960 20.8 21.4 97 21.2 24.0 88 Blackhall Mtn 9820 27.8 -M * 28.1 -M * Cinnabar Park 9574 18.3 20.5 89 21.9 25.2 87 Columbine 9160 16.5 21.0 79 20.5 26.6 77 Divide Peak 8880 14.5 19.3 75 18.2 22.5 81 Joe Wright 10120 19.9 22.1 90 24.3 27.4 89 Laprele Creek 8375 9.8 8.6 114 13.1 13.4 98 Med Bow 10500 37.7 -M * 32.4 -M * Never Summer 10280 18.8 20.6 91 13.6 -M * North French Creek 10130 28.6 32.0 89 28.8 28.1 102 Old Battle 10000 28.9 32.4 89 29.9 36.6 82 Rawah 9020 8.4 8.9 94 14.2 15.5 92 Sage Creek Basin 7850 13.7 7.1 193 10.6 15.1 70 Sand Lake 10050 30.0 30.4 99 27.5 26.4 104 South Brush Creek 8440 6.5 10.1 64 10.8 16.2 67 Tower 10500 34.7 47.7 73 34.2 41.6 82 Webber Springs 9250 18.1 22.6 80 21.8 28.1 78 Whiskey Park 8950 25.5 26.2 97 26.4 29.3 90 Willow Creek Pass 9540 12.2 12.8 95 10.7 14.2 75 Zirkel 9340 17.6 23.0 77 -M 29.5 * ----- ----- Basin Index (%) 89 86 SWEETWATER Deer Park 9700 13.0 16.1 81 16.6 21.1 79 Larsen Creek 9000 4.4 10.5 42 9.9 -M * South Pass 9040 13.0 15.7 83 14.6 18.3 80 ----- ----- Basin Index (%) 72 79 LOWER N. PLATTE Casper Mtn. 7900 14.0 14.5 97 12.7 16.2 78 Laprele Creek 8375 9.8 8.6 114 13.1 13.4 98 Reno Hill 8400 16.1 14.0 115 17.4 16.8 104 Windy Peak 7900 11.8 6.9 171 13.6 11.4 119 ----- ----- Basin Index (%) 118 98 LARAMIE RIVER Brooklyn Lake 10240 24.0 22.1 109 27.0 22.4 121 Cinnabar Park 9574 18.3 20.5 89 21.9 25.2 87 Crow Creek 8330 4.6 1.7 271 10.9 11.9 92 Deadman Hill 10220 20.2 16.6 122 18.2 18.6 98 Rawah 9020 8.4 8.9 94 14.2 15.5 92 Roach 9700 15.0 16.5 91 18.4 20.3 91 Windy Peak 7900 11.8 6.9 171 13.6 11.4 119 ----- ----- Basin Index (%) 110 99 S. PLATTE Crow Creek 8330 4.6 1.7 271 10.9 11.9 92 ----- ----- Basin Index (%) 271 92 LITTLE SNAKE RIVER Battle Mountain 7440 3.1 5.4 57 11.0 15.8 70 Divide Peak 8880 14.5 19.3 75 18.2 22.5 81 Elk River 8700 14.1 16.1 88 13.1 21.0 62 Elkhead Divide 8780 13.5 -M * 17.1 -M * Little Snake River 8915 20.0 25.0 80 28.9 31.0 93 Old Battle 10000 28.9 32.4 89 29.9 36.6 82 Sage Creek Basin 7850 13.7 7.1 193 10.6 15.1 70 Sandstone RS 8150 7.7 10.8 71 14.0 19.2 73 Whiskey Park 8950 25.5 26.2 97 26.4 29.3 90 ----- ----- Basin Index (%) 90 80 UPPER GREEN RIVER Big Sandy Opening 9080 10.2 12.7 80 9.8 13.9 71 Blind Bull Sum 8650 19.5 23.9 82 13.3 20.1 66 East Rim Divide 7930 3.5 9.6 36 8.8 12.1 73 Elkhart Park G.S. 9400 9.4 12.0 78 9.0 13.9 65 Gros Ventre Summit 8750 9.8 13.2 74 10.7 13.5 79 Gunsight Pass 9820 11.0 13.5 81 11.5 14.6 79 Indian Creek 9425 18.6 23.3 80 18.6 23.3 80 Kendall R.S. 7740 7.4 9.0 82 12.9 14.6 88 Larsen Creek 9000 4.4 10.5 42 9.9 -M * Loomis Park 8240 9.6 13.2 73 13.8 17.8 78 New Fork Lake 8340 7.2 9.2 78 10.1 11.2 90 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 -M 11.1 * -M 14.6 * Spring Creek Divide 9000 21.4 23.5 91 22.4 24.6 91 Triple Peak 8500 18.2 19.3 94 22.5 26.1 86 ----- ----- Basin Index (%) 78 79 LOWER GREEN RIVER Blacks Fork Jct 8869 5.5 -M * 10.3 -M * Buck Pasture 9632 11.1 -M * 14.6 -M * EF Blacks Fork GS 9360 11.5 -M * 11.2 -M * Hams Fork 7840 7.1 7.5 95 10.8 11.9 91 Henrys Fork 10182 -M -M * 12.5 -M * Hewinta 9500 10.0 8.7 115 13.2 14.8 89 Hickerson Park 9122 6.9 5.8 119 11.1 10.9 102 Hole-in-Rock 9168 7.6 6.2 123 11.0 10.4 106 Indian Creek 9425 18.6 23.3 80 18.6 23.3 80 Kelley R.S. 8180 11.9 13.1 91 14.5 18.7 78 Spirit Lk 10235 11.9 -M * 14.6 -M * Steel Creek Park 10158 15.4 16.1 96 16.6 17.5 95 ----- ----- Basin Index (%) 96 89 UPPER BEAR RIVER Bear River RS 8777 4.3 -M * 11.1 -M * Bug Lake 7987 13.0 18.0 72 15.0 20.1 75 Burts Miller Ranch 8000 .8 -M * 7.4 -M * Chalk Creek #1 9171 15.6 24.8 63 18.0 26.4 68 Dry Bread Pond 8302 12.8 16.5 78 15.3 20.3 75 Giveout 6930 .6 3.8 16 10.4 12.9 81 Hayden Fork 9130 9.5 12.6 75 18.4 22.1 83 Kelley R.S. 8180 11.9 13.1 91 14.5 18.7 78 Lily Lake 9133 9.6 11.3 85 12.2 18.1 67 Monte Cristo 8932 18.5 27.6 67 19.9 27.0 74 Salt River Summit 7640 10.3 10.3 100 13.4 17.2 78 Spring Creek Divide 9000 21.4 23.5 91 22.4 24.6 91 Trial Lake 9992 16.7 21.3 78 17.6 25.0 70 ----- ----- Basin Index (%) 77 76 ----------------------------------------------------------------------------- -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.