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: MARCH 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 15.0 14.7 102 17.3 19.0 91 Blind Bull Sum 8650 18.9 20.5 92 12.7 17.6 72 Cottonwood Creek 7670 19.1 19.9 96 21.9 21.9 100 East Rim Divide 7930 8.3 9.6 86 8.1 10.6 76 Grand Targhee 9260 32.4 33.0 98 25.8 27.1 95 Granite Creek 6770 14.7 15.0 98 15.6 18.2 86 Grassy Lake 7265 26.3 29.4 89 28.3 32.7 87 Gros Ventre Summit 8750 9.2 11.6 79 9.6 11.5 83 Gunsight Pass 9820 10.7 12.1 88 10.2 12.1 84 Lewis Lake Divide 7850 23.8 27.7 86 27.1 32.1 84 Loomis Park 8240 11.3 13.3 85 13.0 15.6 83 Phillips Bench 8200 21.3 22.4 95 22.6 25.3 89 Salt River Summit 7640 10.9 12.0 91 12.0 15.0 80 Snake River Station 6920 13.6 15.2 89 18.0 20.4 88 Somsen Ranch 6800 10.1 11.8 86 12.5 15.0 83 Spring Creek Divide 9000 20.6 21.1 98 20.7 21.5 96 Thumb Divide 7980 11.8 14.1 84 12.3 16.5 75 Togwotee Pass 9580 20.4 20.6 99 22.5 21.8 103 Triple Peak 8500 20.3 19.5 104 21.3 22.7 94 Two Ocean Plateau 9240 22.9 24.0 95 13.6 24.4 56 Willow Creek 8080 24.4 25.4 96 24.2 29.9 81 Younts Peak 8350 13.3 13.4 99 14.6 14.1 104 ----- ----- Basin Index (%) 93 86 MADISON HEADWATERS IN WYOMING Black Bear 8170 -M 32.5 * 27.6 34.5 80 Canyon 7870 11.4 11.8 97 12.3 14.6 84 Madison Plateau 7750 17.3 20.1 86 18.2 23.7 77 West Yellowstone 6700 9.4 9.9 95 11.7 12.8 91 Whiskey Creek 6800 12.4 14.2 87 15.6 18.2 86 ----- ----- Basin Index (%) 90 82 YELLOWSTONE HEADWATERS IN WYOMING Beartooth Lake 9360 19.3 19.3 100 18.9 17.7 107 Canyon 7870 11.4 11.8 97 12.3 14.6 84 Evening Star 9200 24.9 22.2 112 27.0 24.4 111 Fisher Creek 9100 28.0 28.2 99 30.0 28.5 105 Monument Peak 8850 19.2 16.7 115 21.7 19.1 114 Northeast Entrance 7350 8.0 9.0 89 13.7 11.0 125 Parker Peak 9400 20.4 17.6 116 20.6 15.7 131 Sylvan Lake 8420 16.0 18.2 88 20.4 20.0 102 Thumb Divide 7980 11.8 14.1 84 12.3 16.5 75 Two Ocean Plateau 9240 22.9 24.0 95 13.6 24.4 56 White Mill 8700 23.4 19.9 118 22.4 21.2 106 Wolverine 7650 9.0 8.9 101 14.8 11.0 135 ----- ----- Basin Index (%) 102 102 WIND RIVER Burroughs Creek 8750 10.6 -M * 13.8 -M * Castle Creek 8400 5.4 -M * 7.2 -M * Cold Springs 9630 6.4 6.3 102 8.4 8.6 98 Deer Park 9700 11.2 13.3 84 13.8 17.2 80 Hobbs Park 10100 10.1 11.8 86 10.5 11.1 95 Kirwin 9550 8.4 8.4 100 9.6 10.0 96 Little Warm 9370 9.2 9.2 100 11.5 11.2 103 South Pass 9040 10.7 13.8 78 11.8 15.4 77 St. Lawrence Alt 8620 2.8 6.1 46 4.9 7.5 65 Togwotee Pass 9580 20.4 20.6 99 22.5 21.8 103 Townsend Creek 8700 7.5 8.2 91 9.4 10.1 93 ----- ----- Basin Index (%) 89 91 BIGHORN BASIN Bald Mtn. 9380 14.7 16.5 89 13.9 14.9 93 Bear Trap Meadow 8200 8.4 5.1 165 9.8 7.1 138 Bone Springs Div 9350 13.6 14.1 96 10.5 13.4 78 Grave Springs 8550 7.0 8.1 86 7.9 9.0 88 Kirwin 9550 8.4 8.4 100 9.6 10.0 96 Marquette 8760 3.7 -M * 5.5 -M * Middle Powder 7760 10.4 9.8 106 9.1 10.0 91 Owl Creek 8975 4.9 4.6 107 5.0 5.0 100 Powder River Pass 9480 10.7 9.2 116 9.7 10.8 90 Shell Creek 9580 13.0 12.8 102 10.5 11.9 88 Timber Creek 7950 2.8 4.2 67 4.1 6.1 67 ----- ----- Basin Index (%) 101 92 SHOSHONE RIVER Blackwater 9780 18.9 20.8 91 20.4 18.1 113 Evening Star 9200 24.9 22.2 112 27.0 24.4 111 Marquette 8760 3.7 -M * 5.5 -M * Sylvan Lake 8420 16.0 18.2 88 20.4 20.0 102 Sylvan Road 7120 9.9 10.4 95 -M 15.1 * Younts Peak 8350 13.3 13.4 99 14.6 14.1 104 ----- ----- Basin Index (%) 98 108 POWDER RIVER Bear Trap Meadow 8200 8.4 5.1 165 9.8 7.1 138 Cloud Peak Reservoir 9860 13.5 12.9 105 13.7 11.2 122 Grave Springs 8550 7.0 8.1 86 7.9 9.0 88 Hansen Sawmill 8360 8.2 5.7 144 8.9 7.1 125 Middle Powder 7760 10.4 9.8 106 9.1 10.0 91 Powder River Pass 9480 10.7 9.2 116 9.7 10.8 90 Soldier Park 8720 6.2 -M * 9.4 -M * ----- ----- Basin Index (%) 115 107 TONGUE RIVER Big Goose 7990 7.8 7.8 100 10.4 9.2 113 Bone Springs Div 9350 13.6 14.1 96 10.5 13.4 78 Burgess Junction 7880 9.1 9.5 96 11.5 10.5 110 Dome Lake 8880 11.4 10.2 112 11.8 11.5 103 Little Goose 8870 10.4 -M * 12.1 -M * Sucker Creek 8880 11.8 10.9 108 14.9 12.2 122 Tie Creek 6870 4.2 5.0 84 8.8 9.8 90 ----- ----- Basin Index (%) 101 102 BELLE FOURCHE Blind Park 6890 4.8 7.2 67 7.8 10.5 74 Cole Canyon 5910 3.8 5.5 69 6.2 7.9 78 North Rapid Creek 6130 5.5 6.5 85 7.1 8.6 83 ----- ----- Basin Index (%) 73 78 CHEYENNE RIVER BASIN Blind Park 6890 4.8 7.2 67 7.8 10.5 74 North Rapid Creek 6130 5.5 6.5 85 7.1 8.6 83 ----- ----- Basin Index (%) 75 78 UPPER N. PLATTE Arapaho Ridge 10960 19.2 18.0 107 19.1 19.7 97 Blackhall Mtn 9820 26.5 -M * 26.0 -M * Cinnabar Park 9574 18.1 18.0 101 19.8 21.4 93 Columbine 9160 21.3 22.0 97 18.7 22.9 82 Divide Peak 8880 15.0 17.6 85 16.4 19.1 86 Joe Wright 10120 18.2 19.1 95 20.9 22.9 91 Laprele Creek 8375 10.2 9.1 112 11.3 10.8 105 Med Bow 10500 36.6 -M * 30.1 -M * Never Summer 10280 16.1 17.8 90 11.9 -M * North French Creek 10130 26.7 25.2 106 26.1 23.7 110 Old Battle 10000 26.5 26.3 101 28.1 31.4 89 Rawah 9020 10.9 9.4 116 12.5 12.2 102 Sage Creek Basin 7850 16.6 11.5 144 -M 12.9 * Sand Lake 10050 27.0 24.6 110 24.8 21.7 114 South Brush Creek 8440 9.5 11.1 86 9.5 13.3 71 Tower 10500 32.9 40.0 82 29.9 35.8 84 Webber Springs 9250 19.0 21.0 90 20.1 23.9 84 Whiskey Park 8950 26.9 24.3 111 24.8 25.0 99 Willow Creek Pass 9540 10.4 10.9 95 9.2 11.7 79 Zirkel 9340 21.3 25.7 83 24.5 25.5 96 ----- ----- Basin Index (%) 98 93 SWEETWATER Deer Park 9700 11.2 13.3 84 13.8 17.2 80 Larsen Creek 9000 7.3 11.2 65 8.7 -M * South Pass 9040 10.7 13.8 78 11.8 15.4 77 ----- ----- Basin Index (%) 76 79 LOWER N. PLATTE Casper Mtn. 7900 11.5 12.2 94 9.6 12.8 75 Laprele Creek 8375 10.2 9.1 112 11.3 10.8 105 Reno Hill 8400 13.1 11.9 110 14.0 13.0 108 Windy Peak 7900 11.2 7.1 158 12.1 9.1 133 ----- ----- Basin Index (%) 114 103 LARAMIE RIVER Brooklyn Lake 10240 23.4 17.7 132 24.3 18.5 131 Cinnabar Park 9574 18.1 18.0 101 19.8 21.4 93 Crow Creek 8330 5.4 6.9 78 9.7 8.9 109 Deadman Hill 10220 17.6 13.9 127 16.2 15.0 108 Rawah 9020 10.9 9.4 116 12.5 12.2 102 Roach 9700 14.7 14.0 105 15.9 16.9 94 Windy Peak 7900 11.2 7.1 158 12.1 9.1 133 ----- ----- Basin Index (%) 116 108 S. PLATTE Crow Creek 8330 5.4 6.9 78 9.7 8.9 109 ----- ----- Basin Index (%) 78 109 LITTLE SNAKE RIVER Battle Mountain 7440 8.3 11.4 73 11.6 13.6 85 Divide Peak 8880 15.0 17.6 85 16.4 19.1 86 Elk River 8700 15.6 17.4 90 11.9 18.0 66 Elkhead Divide 8780 14.8 -M * 15.5 -M * Little Snake River 8915 21.3 21.1 101 26.9 26.5 102 Old Battle 10000 26.5 26.3 101 28.1 31.4 89 Sage Creek Basin 7850 16.6 11.5 144 -M 12.9 * Sandstone RS 8150 11.9 12.2 98 13.0 16.7 78 Whiskey Park 8950 26.9 24.3 111 24.8 25.0 99 ----- ----- Basin Index (%) 100 88 UPPER GREEN RIVER Big Sandy Opening 9080 9.2 11.7 79 8.5 11.8 72 Blind Bull Sum 8650 18.9 20.5 92 12.7 17.6 72 East Rim Divide 7930 8.3 9.6 86 8.1 10.6 76 Elkhart Park G.S. 9400 9.0 10.7 84 7.9 11.8 67 Gros Ventre Summit 8750 9.2 11.6 79 9.6 11.5 83 Gunsight Pass 9820 10.7 12.1 88 10.2 12.1 84 Indian Creek 9425 17.8 21.3 84 16.0 20.2 79 Kendall R.S. 7740 10.4 11.3 92 12.1 13.0 93 Larsen Creek 9000 7.3 11.2 65 8.7 -M * Loomis Park 8240 11.3 13.3 85 13.0 15.6 83 New Fork Lake 8340 8.5 9.3 91 9.5 9.7 98 Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 10.5 11.0 95 12.4 12.8 97 Spring Creek Divide 9000 20.6 21.1 98 20.7 21.5 96 Triple Peak 8500 20.3 19.5 104 21.3 22.7 94 ----- ----- Basin Index (%) 89 85 LOWER GREEN RIVER Blacks Fork Jct 8869 6.9 -M * 9.4 -M * Buck Pasture 9632 12.2 -M * 13.0 -M * EF Blacks Fork GS 9360 12.0 -M * 10.4 -M * Hams Fork 7840 9.5 10.3 92 9.2 10.2 90 Henrys Fork 10182 -M -M * 10.8 -M * Hewinta 9500 10.2 9.9 103 12.4 12.3 101 Hickerson Park 9122 8.9 6.6 135 9.8 8.9 110 Hole-in-Rock 9168 7.9 6.6 120 10.3 8.3 124 Indian Creek 9425 17.8 21.3 84 16.0 20.2 79 Kelley R.S. 8180 11.6 13.4 87 13.1 16.2 81 Spirit Lk 10235 12.2 -M * 13.0 -M * Steel Creek Park 10158 13.9 13.4 104 15.1 14.3 106 ----- ----- Basin Index (%) 98 95 UPPER BEAR RIVER Bear River RS 8777 7.3 -M * 9.8 -M * Bug Lake 7987 13.7 16.7 82 12.9 17.4 74 Burts Miller Ranch 8000 5.2 -M * 7.0 -M * Chalk Creek #1 9171 14.4 21.2 68 15.4 22.2 69 Dry Bread Pond 8302 12.2 17.4 70 13.3 17.5 76 Giveout 6930 7.1 8.7 82 9.2 11.4 81 Hayden Fork 9130 11.8 14.3 83 16.5 18.6 89 Kelley R.S. 8180 11.6 13.4 87 13.1 16.2 81 Lily Lake 9133 10.1 11.4 89 10.7 15.0 71 Monte Cristo 8932 17.0 24.4 70 16.7 23.1 72 Salt River Summit 7640 10.9 12.0 91 12.0 15.0 80 Spring Creek Divide 9000 20.6 21.1 98 20.7 21.5 96 Trial Lake 9992 16.1 19.8 81 15.4 21.4 72 ----- ----- Basin Index (%) 81 78 ----------------------------------------------------------------------------- -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.