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 FRIDAY: APRIL 30 , 2021 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Average Avg ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 8.1 9.7 84 18.7 22.6 83 Blind Bull Sum 8650 20.2 23.4 86 13.9 21.2 66 Cottonwood Creek 7670 14.3 15.7 91 24.6 27.3 90 East Rim Divide 7930 .1 8.3 1 9.4 12.9 73 Grand Targhee 9260 36.1 44.4 81 30.6 34.4 89 Granite Creek 6770 7.9 8.5 93 -M 21.3 * Grassy Lake 7265 22.3 29.4 76 32.3 39.1 83 Gros Ventre Summit 8750 8.5 11.7 73 11.4 14.5 79 Gunsight Pass 9820 10.9 12.8 85 12.7 16.0 79 Lewis Lake Divide 7850 21.0 30.3 69 30.4 38.4 79 Loomis Park 8240 7.9 11.2 71 14.8 18.8 79 Phillips Bench 8200 18.8 25.6 73 24.4 30.5 80 Salt River Summit 7640 7.2 8.0 90 14.2 18.3 78 Snake River Station 6920 1.5 7.9 19 19.9 24.6 81 Somsen Ranch 6800 1.5 1.5 100 14.8 18.2 81 Spring Creek Divide 9000 21.7 24.3 89 23.5 26.1 90 Thumb Divide 7980 4.9 12.9 38 14.7 20.8 71 Togwotee Pass 9580 22.7 24.7 92 26.0 27.1 96 Triple Peak 8500 15.4 17.9 86 23.8 27.8 86 Two Ocean Plateau 9240 25.6 29.7 86 23.2 29.9 78 Willow Creek 8080 17.9 23.5 76 27.6 37.4 74 Younts Peak 8350 12.0 15.4 78 16.8 17.5 96 ----- ----- Basin Index (%) 77 82 MADISON HEADWATERS IN WYOMING Black Bear 8170 32.4 37.4 87 32.1 41.6 77 Canyon 7870 11.1 10.8 103 14.1 17.9 79 Madison Plateau 7750 17.4 21.6 81 21.5 28.8 75 West Yellowstone 6700 .2 2.5 8 -M 15.9 * Whiskey Creek 6800 11.2 14.9 75 18.2 22.2 82 ----- ----- Basin Index (%) 83 78 YELLOWSTONE HEADWATERS IN WYOMING Beartooth Lake 9360 21.0 22.9 92 21.4 21.8 98 Canyon 7870 11.1 10.8 103 14.1 17.9 79 Evening Star 9200 25.6 24.9 103 30.7 30.2 102 Fisher Creek 9100 31.5 32.8 96 35.0 34.9 100 Monument Peak 8850 21.8 21.0 104 26.3 24.2 109 Northeast Entrance 7350 .0 3.5 0 15.4 13.7 112 Parker Peak 9400 23.2 21.4 108 24.6 19.9 124 Sylvan Lake 8420 11.6 20.1 58 23.2 24.9 93 Thumb Divide 7980 4.9 12.9 38 14.7 20.8 71 Two Ocean Plateau 9240 25.6 29.7 86 23.2 29.9 78 White Mill 8700 25.7 23.8 108 25.4 26.1 97 Wolverine 7650 3.5 3.1 113 17.1 13.7 125 ----- ----- Basin Index (%) 91 98 WIND RIVER Burroughs Creek 8750 10.4 -M * 16.9 -M * Castle Creek 8400 3.7 -M * 10.0 -M * Cold Springs 9630 6.8 1.4 486 12.3 12.4 99 Deer Park 9700 13.5 16.1 84 18.3 23.2 79 Hobbs Park 10100 14.5 16.0 91 16.5 16.5 100 Kirwin 9550 11.8 10.4 113 13.8 13.6 101 Little Warm 9370 9.7 8.8 110 14.4 15.3 94 South Pass 9040 13.0 15.0 87 15.2 20.2 75 St. Lawrence Alt 8620 1.9 3.0 63 8.7 11.4 76 Togwotee Pass 9580 22.7 24.7 92 26.0 27.1 96 Townsend Creek 8700 10.6 7.8 136 14.4 14.8 97 ----- ----- Basin Index (%) 101 90 BIGHORN BASIN Bald Mtn. 9380 20.4 20.5 100 18.6 19.5 95 Bear Trap Meadow 8200 7.3 1.1 664 13.0 10.4 125 Bone Springs Div 9350 19.2 16.6 116 15.1 18.0 84 Grave Springs 8550 8.0 9.4 85 10.4 12.6 83 Kirwin 9550 11.8 10.4 113 13.8 13.6 101 Marquette 8760 8.4 -M * 10.4 -M * Middle Powder 7760 13.2 11.8 112 12.3 14.0 88 Owl Creek 8975 5.6 1.2 467 9.2 7.8 118 Powder River Pass 9480 12.2 9.6 127 13.5 14.9 91 Shell Creek 9580 -M 16.0 * -M 16.1 * Timber Creek 7950 4.7 3.2 147 9.4 9.8 96 ----- ----- Basin Index (%) 122 96 SHOSHONE RIVER Blackwater 9780 20.7 25.2 82 24.1 23.3 103 Evening Star 9200 25.6 24.9 103 30.7 30.2 102 Marquette 8760 8.4 -M * 10.4 -M * Sylvan Lake 8420 11.6 20.1 58 23.2 24.9 93 Sylvan Road 7120 .0 6.3 0 14.5 18.5 78 Younts Peak 8350 12.0 15.4 78 16.8 17.5 96 ----- ----- Basin Index (%) 76 96 POWDER RIVER Bear Trap Meadow 8200 7.3 1.1 664 13.0 10.4 125 Cloud Peak Reservoir 9860 18.2 16.5 110 19.6 16.4 120 Grave Springs 8550 8.0 9.4 85 10.4 12.6 83 Hansen Sawmill 8360 10.3 2.9 355 13.3 10.7 124 Middle Powder 7760 13.2 11.8 112 12.3 14.0 88 Powder River Pass 9480 12.2 9.6 127 13.5 14.9 91 Soldier Park 8720 8.9 -M * 13.7 -M * ----- ----- Basin Index (%) 135 104 TONGUE RIVER Big Goose 7990 11.7 9.2 127 15.4 13.8 112 Bone Springs Div 9350 19.2 16.6 116 15.1 18.0 84 Burgess Junction 7880 14.4 12.1 119 17.0 14.6 116 Dome Lake 8880 14.0 11.5 122 17.0 16.2 105 Little Goose 8870 15.1 -M * 18.0 -M * Sucker Creek 8880 16.3 12.3 133 21.0 17.1 123 Tie Creek 6870 5.7 2.7 211 14.2 14.1 101 ----- ----- Basin Index (%) 126 106 BELLE FOURCHE Blind Park 6890 .0 1.3 0 11.2 14.1 79 Cole Canyon 5910 .3 .3 100* 9.6 11.5 83 North Rapid Creek 6130 3.1 1.3 238 11.6 12.0 97 ----- ----- Basin Index (%) 117 86 CHEYENNE RIVER BASIN Blind Park 6890 .0 1.3 0 11.2 14.1 79 North Rapid Creek 6130 3.1 1.3 238 11.6 12.0 97 ----- ----- Basin Index (%) 119 87 UPPER N. PLATTE Arapaho Ridge 10960 21.4 22.3 96 23.4 26.0 90 Blackhall Mtn 9820 27.8 -M * 29.6 -M * Cinnabar Park 9574 17.9 19.7 91 23.1 26.8 86 Columbine 9160 13.2 18.6 71 22.0 28.4 77 Divide Peak 8880 12.1 18.0 67 19.1 24.1 79 Joe Wright 10120 23.0 23.4 98 26.9 29.6 91 Laprele Creek 8375 8.6 6.4 134 14.1 14.9 95 Med Bow 10500 40.0 -M * 33.1 -M * Never Summer 10280 19.1 21.7 88 15.1 -M * North French Creek 10130 28.4 32.9 86 29.7 30.5 97 Old Battle 10000 29.7 34.7 86 31.4 39.0 81 Rawah 9020 6.3 6.5 97 15.4 17.1 90 Sage Creek Basin 7850 7.0 1.1 636* 11.2 16.1 70 Sand Lake 10050 30.7 31.3 98 28.4 28.9 98 South Brush Creek 8440 2.5 9.6 26 11.1 17.7 63 Tower 10500 35.8 49.9 72 36.1 44.5 81 Webber Springs 9250 18.1 21.9 83 23.5 29.8 79 Whiskey Park 8950 22.4 26.3 85 27.1 31.3 87 Willow Creek Pass 9540 12.7 14.1 90 11.9 15.6 76 Zirkel 9340 14.0 21.2 66 27.6 30.8 90 ----- ----- Basin Index (%) 85 85 SWEETWATER Deer Park 9700 13.5 16.1 84 18.3 23.2 79 Larsen Creek 9000 2.0 9.3 22 10.6 -M * South Pass 9040 13.0 15.0 87 15.2 20.2 75 ----- ----- Basin Index (%) 71 77 LOWER N. PLATTE Casper Mtn. 7900 12.8 13.7 93 13.2 17.8 74 Laprele Creek 8375 8.6 6.4 134 14.1 14.9 95 Reno Hill 8400 15.5 12.8 121 18.2 18.7 97 Windy Peak 7900 10.9 4.4 248 14.4 12.9 112 ----- ----- Basin Index (%) 128 93 LARAMIE RIVER Brooklyn Lake 10240 23.1 23.3 99 28.0 24.5 114 Cinnabar Park 9574 17.9 19.7 91 23.1 26.8 86 Crow Creek 8330 2.3 .0 * 12.2 13.3 92 Deadman Hill 10220 21.6 18.9 114 20.5 20.5 100 Rawah 9020 6.3 6.5 97 15.4 17.1 90 Roach 9700 15.5 17.2 90 20.6 22.2 93 Windy Peak 7900 10.9 4.4 248 14.4 12.9 112 ----- ----- Basin Index (%) 108 98 S. PLATTE Crow Creek 8330 2.3 .0 * 12.2 13.3 92 ----- ----- Basin Index (%) * 92 LITTLE SNAKE RIVER Battle Mountain 7440 .0 .0 * 12.1 17.0 71 Divide Peak 8880 12.1 18.0 67 19.1 24.1 79 Elk River 8700 8.8 13.6 65 13.6 22.5 60 Elkhead Divide 8780 10.5 -M * 17.7 -M * Little Snake River 8915 17.4 22.5 77 29.6 32.5 91 Old Battle 10000 29.7 34.7 86 31.4 39.0 81 Sage Creek Basin 7850 7.0 1.1 636* 11.2 16.1 70 Sandstone RS 8150 1.2 6.3 19 14.4 20.6 70 Whiskey Park 8950 22.4 26.3 85 27.1 31.3 87 ----- ----- Basin Index (%) 80 78 UPPER GREEN RIVER Big Sandy Opening 9080 10.2 10.9 94 10.5 15.1 70 Blind Bull Sum 8650 20.2 23.4 86 13.9 21.2 66 East Rim Divide 7930 .1 8.3 1 9.4 12.9 73 Elkhart Park G.S. 9400 9.9 11.5 86 10.3 14.9 69 Gros Ventre Summit 8750 8.5 11.7 73 11.4 14.5 79 Gunsight Pass 9820 10.9 12.8 85 12.7 16.0 79 Indian Creek 9425 18.0 23.3 77 19.7 24.9 79 Kendall R.S. 7740 .2 4.8 4 13.8 15.4 90 Larsen Creek 9000 2.0 9.3 22 10.6 -M * Loomis Park 8240 7.9 11.2 71 14.8 18.8 79 New Fork Lake 8340 4.1 6.6 62 11.1 12.0 92 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 -M 9.5 * -M 15.5 * Spring Creek Divide 9000 21.7 24.3 89 23.5 26.1 90 Triple Peak 8500 15.4 17.9 86 23.8 27.8 86 ----- ----- Basin Index (%) 73 80 LOWER GREEN RIVER Blacks Fork Jct 8869 2.9 -M * 11.1 -M * Buck Pasture 9632 10.7 -M * 16.1 -M * EF Blacks Fork GS 9360 10.1 -M * 12.4 -M * Hams Fork 7840 .7 3.3 21 11.8 13.0 91 Henrys Fork 10182 -M -M * 13.9 -M * Hewinta 9500 7.2 5.0 144 14.5 16.0 91 Hickerson Park 9122 3.6 4.5 80 12.1 11.9 102 Hole-in-Rock 9168 5.6 2.9 193 12.5 11.4 110 Indian Creek 9425 18.0 23.3 77 19.7 24.9 79 Kelley R.S. 8180 9.1 11.7 78 15.3 20.1 76 Spirit Lk 10235 12.4 -M * 16.4 -M * Steel Creek Park 10158 16.1 17.0 95 18.3 18.9 97 ----- ----- Basin Index (%) 89 90 UPPER BEAR RIVER Bear River RS 8777 .1 -M * 11.5 -M * Bug Lake 7987 10.0 15.4 65 15.6 21.6 72 Burts Miller Ranch 8000 .0 -M * 7.7 -M * Chalk Creek #1 9171 14.2 24.4 58 19.2 28.2 68 Dry Bread Pond 8302 7.2 15.0 48 16.0 21.7 74 Giveout 6930 .0 .0 * 10.7 13.8 78 Hayden Fork 9130 4.1 9.5 43 19.1 23.6 81 Kelley R.S. 8180 9.1 11.7 78 15.3 20.1 76 Lily Lake 9133 7.7 9.9 78 12.8 19.4 66 Monte Cristo 8932 16.8 26.9 62 20.8 29.1 71 Salt River Summit 7640 7.2 8.0 90 14.2 18.3 78 Spring Creek Divide 9000 21.7 24.3 89 23.5 26.1 90 Trial Lake 9992 16.4 22.9 72 18.6 26.8 69 ----- ----- Basin Index (%) 68 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.