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 SATURDAY: MAY 8 , 2021 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 1.9 5.5 35 19.2 23.5 82 Blind Bull Sum 8650 20.0 22.6 88 14.3 22.0 65 Cottonwood Creek 7670 9.7 13.3 73 25.5 28.6 89 East Rim Divide 7930 .1 6.6 2 10.4 13.4 78 Grand Targhee 9260 35.2 46.4 76 31.3 35.9 87 Granite Creek 6770 2.9 6.3 46 16.0 21.9 73 Grassy Lake 7265 16.0 26.7 60 32.9 40.3 82 Gros Ventre Summit 8750 5.1 10.0 51 11.8 15.2 78 Gunsight Pass 9820 8.9 11.8 75 13.2 16.7 79 Lewis Lake Divide 7850 14.7 29.5 50 31.0 39.5 78 Loomis Park 8240 3.6 8.0 45 15.5 19.6 79 Phillips Bench 8200 13.7 23.4 59 24.9 31.6 79 Salt River Summit 7640 1.6 5.7 28 14.8 18.9 78 Snake River Station 6920 .1 3.5 3 20.5 25.4 81 Somsen Ranch 6800 .0 .0 * 15.1 19.0 79 Spring Creek Divide 9000 21.1 24.0 88 24.2 26.9 90 Thumb Divide 7980 .2 9.4 2 15.4 21.6 71 Togwotee Pass 9580 21.4 25.2 85 26.8 28.3 95 Triple Peak 8500 10.7 15.3 70 24.8 28.9 86 Two Ocean Plateau 9240 24.3 29.7 82 24.0 30.9 78 Willow Creek 8080 12.5 21.5 58 28.9 38.9 74 Younts Peak 8350 4.8 15.6 31 17.2 18.3 94 ----- ----- Basin Index (%) 63 81 MADISON HEADWATERS IN WYOMING Black Bear 8170 -M 36.9 * 32.5 42.8 76 Canyon 7870 6.5 8.0 81 14.2 18.6 76 Madison Plateau 7750 12.0 20.6 58 21.7 29.8 73 West Yellowstone 6700 .0 .0 * -M 16.5 * Whiskey Creek 6800 7.4 11.5 64 18.2 22.9 79 ----- ----- Basin Index (%) 65 76 YELLOWSTONE HEADWATERS IN WYOMING Beartooth Lake 9360 21.5 23.0 93 22.3 22.8 98 Canyon 7870 6.5 8.0 81 14.2 18.6 76 Evening Star 9200 22.3 25.2 88 31.8 31.5 101 Fisher Creek 9100 29.0 33.8 86 35.3 36.3 97 Monument Peak 8850 17.2 21.6 80 26.7 25.4 105 Northeast Entrance 7350 -M 1.0 * 15.6 14.4 108 Parker Peak 9400 20.3 21.7 94 25.5 20.9 122 Sylvan Lake 8420 6.9 18.2 38 23.9 26.0 92 Thumb Divide 7980 .2 9.4 2 15.4 21.6 71 Two Ocean Plateau 9240 24.3 29.7 82 24.0 30.9 78 White Mill 8700 22.4 24.5 91 25.6 27.2 94 Wolverine 7650 .0 .4 0* 17.3 14.3 121 ----- ----- Basin Index (%) 79 96 WIND RIVER Burroughs Creek 8750 6.4 -M * 17.7 -M * Castle Creek 8400 .0 -M * 10.6 -M * Cold Springs 9630 4.8 1.6 300 13.2 13.2 100 Deer Park 9700 11.1 14.6 76 19.0 24.3 78 Hobbs Park 10100 14.6 15.9 92 17.8 17.6 101 Kirwin 9550 10.7 10.8 99 14.5 14.6 99 Little Warm 9370 8.2 6.9 119 15.6 16.1 97 South Pass 9040 10.6 12.6 84 15.4 21.1 73 St. Lawrence Alt 8620 .0 1.4 0 9.5 12.2 78 Togwotee Pass 9580 21.4 25.2 85 26.8 28.3 95 Townsend Creek 8700 9.0 4.8 188 15.6 15.6 100 ----- ----- Basin Index (%) 96 90 BIGHORN BASIN Bald Mtn. 9380 20.1 20.4 99 18.8 20.7 91 Bear Trap Meadow 8200 3.7 .2 1850* 13.7 11.4 120 Bone Springs Div 9350 18.7 16.4 114 16.1 19.3 83 Grave Springs 8550 6.0 8.2 73 10.7 13.7 78 Kirwin 9550 10.7 10.8 99 14.5 14.6 99 Marquette 8760 7.3 -M * 11.7 -M * Middle Powder 7760 10.8 11.1 97 13.0 15.0 87 Owl Creek 8975 2.1 .5 420* 9.7 8.4 115 Powder River Pass 9480 11.5 9.0 128 14.3 16.0 89 Shell Creek 9580 17.6 16.6 106 15.6 17.3 90 Timber Creek 7950 2.6 1.8 144 10.8 10.7 101 ----- ----- Basin Index (%) 109 93 SHOSHONE RIVER Blackwater 9780 22.3 25.2 88 25.3 24.3 104 Evening Star 9200 22.3 25.2 88 31.8 31.5 101 Marquette 8760 7.3 -M * 11.7 -M * Sylvan Lake 8420 6.9 18.2 38 23.9 26.0 92 Sylvan Road 7120 .0 2.4 0 15.1 19.2 79 Younts Peak 8350 4.8 15.6 31 17.2 18.3 94 ----- ----- Basin Index (%) 65 95 POWDER RIVER Bear Trap Meadow 8200 3.7 .2 1850* 13.7 11.4 120 Cloud Peak Reservoir 9860 18.8 16.6 113 21.1 17.8 119 Grave Springs 8550 6.0 8.2 73 10.7 13.7 78 Hansen Sawmill 8360 8.6 1.5 573 14.5 11.6 125 Middle Powder 7760 10.8 11.1 97 13.0 15.0 87 Powder River Pass 9480 11.5 9.0 128 14.3 16.0 89 Soldier Park 8720 6.7 -M * 14.7 -M * ----- ----- Basin Index (%) 127 102 TONGUE RIVER Big Goose 7990 11.0 10.3 107 16.6 15.4 108 Bone Springs Div 9350 18.7 16.4 114 16.1 19.3 83 Burgess Junction 7880 13.2 11.4 116 17.7 15.7 113 Dome Lake 8880 14.6 11.2 130 18.3 17.5 105 Little Goose 8870 14.9 -M * 19.8 -M * Sucker Creek 8880 15.4 12.3 125 22.2 18.6 119 Tie Creek 6870 2.1 1.8 117 14.8 15.5 95 ----- ----- Basin Index (%) 118 104 BELLE FOURCHE Blind Park 6890 .0 .0 * 11.4 15.1 75 Cole Canyon 5910 .0 .0 * 9.7 13.2 73 North Rapid Creek 6130 .2 .0 * 11.8 13.0 91 ----- ----- Basin Index (%) * 80 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 11.4 15.1 75 North Rapid Creek 6130 .2 .0 * 11.8 13.0 91 ----- ----- Basin Index (%) * 83 UPPER N. PLATTE Arapaho Ridge 10960 19.9 22.3 89 24.5 27.0 91 Blackhall Mtn 9820 26.5 -M * 31.0 -M * Cinnabar Park 9574 17.2 18.0 96 24.8 28.0 89 Columbine 9160 8.1 14.4 56 22.8 29.3 78 Divide Peak 8880 8.1 15.6 52 20.4 25.2 81 Joe Wright 10120 22.5 22.9 98 28.6 30.9 93 Laprele Creek 8375 5.3 4.0 132 14.9 15.8 94 Med Bow 10500 37.6 -M * 34.0 -M * Never Summer 10280 18.6 22.1 84 16.2 -M * North French Creek 10130 25.9 32.8 79 30.3 31.9 95 Old Battle 10000 29.5 36.2 81 32.7 40.4 81 Rawah 9020 2.8 3.4 82 16.2 17.9 91 Sage Creek Basin 7850 .3 .0 * 12.2 16.7 73 Sand Lake 10050 31.3 31.8 98 30.1 30.1 100 South Brush Creek 8440 .0 6.2 0 11.4 18.7 61 Tower 10500 35.3 51.4 69 37.6 46.1 82 Webber Springs 9250 17.0 20.2 84 24.8 30.8 81 Whiskey Park 8950 20.6 27.0 76 28.5 32.6 87 Willow Creek Pass 9540 11.4 14.0 81 12.6 16.3 77 Zirkel 9340 11.1 20.1 55 29.7 32.0 93 ----- ----- Basin Index (%) 79 86 SWEETWATER Deer Park 9700 11.1 14.6 76 19.0 24.3 78 Larsen Creek 9000 .0 7.1 0 11.0 -M * South Pass 9040 10.6 12.6 84 15.4 21.1 73 ----- ----- Basin Index (%) 63 76 LOWER N. PLATTE Casper Mtn. 7900 10.3 11.9 87 14.3 19.0 75 Laprele Creek 8375 5.3 4.0 132 14.9 15.8 94 Reno Hill 8400 13.3 11.4 117 19.2 19.9 96 Windy Peak 7900 7.5 1.6 469 14.9 13.6 110 ----- ----- Basin Index (%) 126 93 LARAMIE RIVER Brooklyn Lake 10240 21.0 21.9 96 29.1 25.7 113 Cinnabar Park 9574 17.2 18.0 96 24.8 28.0 89 Crow Creek 8330 .0 .0 * 13.7 14.1 97 Deadman Hill 10220 21.2 18.7 113 22.0 21.5 102 Rawah 9020 2.8 3.4 82 16.2 17.9 91 Roach 9700 14.9 16.4 91 22.6 23.1 98 Windy Peak 7900 7.5 1.6 469 14.9 13.6 110 ----- ----- Basin Index (%) 106 100 S. PLATTE Crow Creek 8330 .0 .0 * 13.7 14.1 97 ----- ----- Basin Index (%) * 97 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 12.5 17.7 71 Divide Peak 8880 8.1 15.6 52 20.4 25.2 81 Elk River 8700 3.4 9.3 37 14.5 23.5 62 Elkhead Divide 8780 6.7 -M * 18.6 -M * Little Snake River 8915 13.7 20.9 66 30.5 34.0 90 Old Battle 10000 29.5 36.2 81 32.7 40.4 81 Sage Creek Basin 7850 .3 .0 * 12.2 16.7 73 Sandstone RS 8150 -M 2.7 * 15.0 21.5 70 Whiskey Park 8950 20.6 27.0 76 28.5 32.6 87 ----- ----- Basin Index (%) 69 79 UPPER GREEN RIVER Big Sandy Opening 9080 6.9 8.7 79 10.9 15.9 69 Blind Bull Sum 8650 20.0 22.6 88 14.3 22.0 65 East Rim Divide 7930 .1 6.6 2 10.4 13.4 78 Elkhart Park G.S. 9400 7.4 9.8 76 11.0 15.7 70 Gros Ventre Summit 8750 5.1 10.0 51 11.8 15.2 78 Gunsight Pass 9820 8.9 11.8 75 13.2 16.7 79 Indian Creek 9425 13.9 21.1 66 20.2 25.8 78 Kendall R.S. 7740 .0 .2 0* 14.2 16.0 89 Larsen Creek 9000 .0 7.1 0 11.0 -M * Loomis Park 8240 3.6 8.0 45 15.5 19.6 79 New Fork Lake 8340 .0 3.5 0 11.7 12.7 92 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 -M 7.6 * -M 16.1 * Spring Creek Divide 9000 21.1 24.0 88 24.2 26.9 90 Triple Peak 8500 10.7 15.3 70 24.8 28.9 86 ----- ----- Basin Index (%) 66 80 LOWER GREEN RIVER Blacks Fork Jct 8869 .5 -M * 11.2 -M * Buck Pasture 9632 4.7 -M * 16.5 -M * EF Blacks Fork GS 9360 3.1 -M * 12.8 -M * Hams Fork 7840 .0 .3 0* 12.2 13.6 90 Henrys Fork 10182 -M -M * 14.1 -M * Hewinta 9500 .0 2.9 0 14.6 16.9 86 Hickerson Park 9122 .0 1.2 0 12.2 12.6 97 Hole-in-Rock 9168 .4 .7 57* 12.8 12.1 106 Indian Creek 9425 13.9 21.1 66 20.2 25.8 78 Kelley R.S. 8180 3.9 8.9 44 16.0 20.8 77 Spirit Lk 10235 8.1 -M * 16.6 -M * Steel Creek Park 10158 12.5 17.7 71 18.5 19.9 93 ----- ----- Basin Index (%) 58* 88 UPPER BEAR RIVER Bear River RS 8777 .1 -M * 11.6 -M * Bug Lake 7987 4.5 12.6 36 16.0 22.4 71 Burts Miller Ranch 8000 .0 -M * 7.8 -M * Chalk Creek #1 9171 7.5 22.2 34 19.5 29.4 66 Dry Bread Pond 8302 .0 10.0 0 16.1 22.5 72 Giveout 6930 .0 .0 * 11.0 14.4 76 Hayden Fork 9130 .0 6.6 0 19.3 24.6 78 Kelley R.S. 8180 3.9 8.9 44 16.0 20.8 77 Lily Lake 9133 .6 7.0 9 13.0 20.3 64 Monte Cristo 8932 10.1 22.7 44 21.1 30.3 70 Salt River Summit 7640 1.6 5.7 28 14.8 18.9 78 Spring Creek Divide 9000 21.1 24.0 88 24.2 26.9 90 Trial Lake 9992 9.7 21.0 46 18.8 27.8 68 ----- ----- Basin Index (%) 42 73 ----------------------------------------------------------------------------- -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.