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 WEDNESDAY: MAY 17 , 2023 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Median Med ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 4.1 .6 683* 22.9 24.2 95 Blind Bull Sum 8650 26.3 22.6 116 20.7 20.7 100 Cottonwood Creek 7670 14.8 9.1 163 32.9 30.0 110 East Rim Divide 7930 -M .0 * 13.5 13.8 98 Grand Targhee 9260 43.5 44.2 98 33.7 37.5 90 Granite Creek 6770 3.1 1.2 258* 16.7 22.2 75 Grassy Lake 7265 24.6 19.0 129 43.4 40.5 107 Gros Ventre Summit 8750 4.4 7.4 59 11.8 15.2 78 Gunsight Pass 9820 8.7 11.0 79 15.5 17.4 89 Lewis Lake Divide 7850 27.5 23.4 118 43.4 39.2 111 Loomis Park 8240 6.0 4.6 130 18.3 20.4 90 Phillips Bench 8200 20.8 21.0 99 32.6 30.8 106 Salt River Summit 7640 5.8 .0 * 23.1 18.9 122 Snake River Station 6920 .0 .0 * 25.0 26.6 94 Somsen Ranch 6800 .5 .0 * 23.9 19.6 122 Spring Creek Divide 9000 26.0 21.7 120 33.9 27.5 123 Thumb Divide 7980 6.9 3.6 192 21.4 22.3 96 Togwotee Pass 9580 19.1 23.4 82 24.5 29.0 84 Triple Peak 8500 14.3 12.6 113 28.9 30.2 96 Two Ocean Plateau 9240 28.9 30.8 94 31.0 31.2 99 Willow Creek 8080 22.8 18.2 125 41.7 40.0 104 Younts Peak 8350 .4 9.0 4 15.5 18.2 85 ----- ----- Basin Index (%) 109 100 MADISON HEADWATERS IN WYOMING Black Bear 8170 43.7 36.6 119 47.5 42.8 111 Canyon 7870 6.3 -M * 19.8 -M * Madison Plateau 7750 23.4 16.8 139 32.9 30.6 108 West Yellowstone 6700 .0 .0 * 20.9 16.8 124 Whiskey Creek 6800 14.5 6.9 210 28.6 24.2 118 ----- ----- Basin Index (%) 135 114 YELLOWSTONE HEADWATERS IN WYOMING Beartooth Lake 9360 19.3 23.6 82 21.1 25.0 84 Canyon 7870 6.3 -M * 19.8 -M * Evening Star 9200 21.6 24.6 88 32.4 33.8 96 Fisher Creek 9100 31.8 36.2 88 39.2 40.9 96 Monument Peak 8850 14.6 19.5 75 27.4 27.2 101 Northeast Entrance 7350 .0 .0 * 14.4 16.2 89 Parker Peak 9400 19.3 20.9 92 27.5 24.0 115 Sylvan Lake 8420 10.3 14.3 72 26.9 27.9 96 Thumb Divide 7980 6.9 3.6 192 21.4 22.3 96 Two Ocean Plateau 9240 28.9 30.8 94 31.0 31.2 99 White Mill 8700 21.7 24.2 90 26.4 27.6 96 Wolverine 7650 .0 .0 * 14.9 15.2 98 ----- ----- Basin Index (%) 88 97 WIND RIVER Burroughs Creek 8750 .0 -M * 12.2 -M * Castle Creek 8400 .0 .0 * 8.5 11.6 73 Cold Springs 9630 .0 .0 * 13.0 13.5 96 Deer Park 9700 19.6 12.2 161 29.9 23.4 128 Hobbs Park 10100 16.2 16.0 101 22.0 18.8 117 Kirwin 9550 5.4 10.4 52 16.5 16.3 101 Little Warm 9370 1.5 5.2 29 15.3 15.2 101 South Pass 9040 13.6 9.8 139 24.8 19.6 127 St. Lawrence Alt 8620 .0 -M * 14.6 -M * Togwotee Pass 9580 19.1 23.4 82 24.5 29.0 84 Townsend Creek 8700 6.1 1.4 436 19.1 15.7 122 ----- ----- Basin Index (%) 104 106 BIGHORN BASIN Bald Mtn. 9380 15.7 19.4 81 18.4 20.3 91 Bear Trap Meadow 8200 .0 .0 * 13.1 12.6 104 Bone Springs Div 9350 11.8 15.4 77 15.6 19.4 80 Grave Springs 8550 .1 4.4 2 15.2 13.2 115 Kirwin 9550 5.4 10.4 52 16.5 16.3 101 Marquette 8760 2.9 5.0 58 14.1 14.9 95 Middle Powder 7760 .4 5.5 7 14.2 13.6 104 Owl Creek 8975 .0 .0 * 11.4 9.5 120 Powder River Pass 9480 .0 7.5 0 16.7 17.0 98 Shell Creek 9580 11.6 15.4 75 17.1 17.6 97 Timber Creek 7950 .1 .0 * 10.9 12.0 91 ----- ----- Basin Index (%) 58 98 SHOSHONE RIVER Blackwater 9780 20.8 23.1 90 26.1 27.5 95 Evening Star 9200 21.6 24.6 88 32.4 33.8 96 Marquette 8760 2.9 5.0 58 14.1 14.9 95 Sylvan Lake 8420 10.3 14.3 72 26.9 27.9 96 Sylvan Road 7120 .0 .0 * 16.6 19.2 86 Younts Peak 8350 .4 9.0 4 15.5 18.2 85 ----- ----- Basin Index (%) 74 93 POWDER RIVER Bear Trap Meadow 8200 .0 .0 * 13.1 12.6 104 Cloud Peak Reservoir 9860 13.4 14.5 92 20.0 19.5 103 Grave Springs 8550 .1 4.4 2 15.2 13.2 115 Hansen Sawmill 8360 .0 .0 * 12.8 13.2 97 Middle Powder 7760 .4 5.5 7 14.2 13.6 104 Powder River Pass 9480 .0 7.5 0 16.7 17.0 98 Soldier Park 8720 .1 .1 100* 12.4 12.8 97 ----- ----- Basin Index (%) 44 102 TONGUE RIVER Big Goose 7990 2.5 6.2 40 14.4 15.8 91 Bone Springs Div 9350 11.8 15.4 77 15.6 19.4 80 Burgess Junction 7880 6.9 8.6 80 17.3 16.4 105 Dome Lake 8880 4.2 8.2 51 15.1 19.0 79 Little Goose 8870 3.3 8.0 41 16.1 17.4 93 Sucker Creek 8880 6.1 9.1 67 20.2 19.9 102 Tie Creek 6870 .0 .0 * 16.3 16.1 101 ----- ----- Basin Index (%) 63 93 BELLE FOURCHE Blind Park 6890 .0 .0 * 14.2 14.6 97 Cole Canyon 5910 .0 .0 * 14.1 14.0 101 North Rapid Creek 6130 .1 .0 * 12.6 12.6 100 ----- ----- Basin Index (%) * 99 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 14.2 14.6 97 North Rapid Creek 6130 .1 .0 * 12.6 12.6 100 ----- ----- Basin Index (%) * 99 UPPER N. PLATTE Arapaho Ridge 10976 22.4 19.8 113 29.4 28.2 104 Blackhall Mtn 9839 29.7 27.9 106 42.7 39.0 109 Cinnabar Park 9707 -M 14.2 * 26.8 27.9 96 Columbine 9167 7.5 4.8 156 31.2 30.8 101 Divide Peak 8730 13.0 7.5 173 32.9 25.7 128 Joe Wright 10158 22.0 20.4 108 32.7 32.8 100 Laprele Creek 8390 .1 .0 * 16.7 16.4 102 Med Bow 10512 39.6 -M * 40.4 -M * Never Summer 10323 25.1 20.4 123 23.2 21.9 106 North French Creek 10153 23.9 31.3 76 34.4 35.4 97 Old Battle 9860 40.3 34.7 116 46.7 41.6 112 Rawah 9069 .6 .1 600* 20.8 20.2 103 Sage Creek Basin 7850 -M .0 * 22.6 16.4 138 Sand Lake 10098 28.3 29.8 95 34.2 31.6 108 South Brush Creek 8495 .2 .0 * 17.4 19.0 92 Tower 10620 54.5 46.2 118 56.8 48.6 117 Webber Springs 9260 21.1 13.0 162 35.9 32.0 112 Whiskey Park 9020 27.8 23.6 118 39.3 35.3 111 Willow Creek Pass 9523 13.8 11.3 122 21.1 17.3 122 Zirkel 9338 11.2 11.6 97 38.3 35.6 108 ----- ----- Basin Index (%) 113 109 SWEETWATER Deer Park 9700 19.6 12.2 161 29.9 23.4 128 Larsen Creek 9000 -M .0 * 17.5 16.5 106 South Pass 9040 13.6 9.8 139 24.8 19.6 127 ----- ----- Basin Index (%) 151 121 LOWER N. PLATTE Casper Mtn. 7920 .2 4.0 5 21.1 18.6 113 Laprele Creek 8390 .1 .0 * 16.7 16.4 102 Reno Hill 8430 7.1 8.0 89 22.4 21.6 104 Windy Peak 7915 .0 .0 * 15.4 14.4 107 ----- ----- Basin Index (%) 62 106 LARAMIE RIVER Brooklyn Lake 10250 14.3 18.4 78 30.4 27.4 111 Cinnabar Park 9707 -M 14.2 * 26.8 27.9 96 Crow Creek 8335 .0 .0 * 12.6 14.0 90 Deadman Hill 10239 17.5 16.8 104 24.7 23.7 104 Rawah 9069 .6 .1 600* 20.8 20.2 103 Roach 9740 10.9 11.2 97 25.6 24.0 107 Windy Peak 7915 .0 .0 * 15.4 14.4 107 ----- ----- Basin Index (%) 93* 103 S. PLATTE Crow Creek 8335 .0 .0 * 12.6 14.0 90 ----- ----- Basin Index (%) * 90 LITTLE SNAKE RIVER Battle Mountain 7498 -M .0 * 24.4 18.6 131 Divide Peak 8730 13.0 7.5 173 32.9 25.7 128 Elk River 8739 4.6 .6 767* 30.3 23.6 128 Elkhead Divide 8800 12.8 -M * 34.2 -M * Little Snake River 8928 23.8 14.5 164 46.8 39.4 119 Old Battle 9860 40.3 34.7 116 46.7 41.6 112 Sage Creek Basin 7850 -M .0 * 22.6 16.4 138 Sandstone RS 8152 2.5 .0 * 27.4 21.5 127 Whiskey Park 9020 27.8 23.6 118 39.3 35.3 111 ----- ----- Basin Index (%) 138 122 UPPER GREEN RIVER Big Sandy Opening 9080 7.4 6.8 109 18.6 16.0 116 Blind Bull Sum 8650 26.3 22.6 116 20.7 20.7 100 East Rim Divide 7930 -M .0 * 13.5 13.8 98 Elkhart Park G.S. 9400 5.0 7.5 67 14.1 16.0 88 Gros Ventre Summit 8750 4.4 7.4 59 11.8 15.2 78 Gunsight Pass 9820 8.7 11.0 79 15.5 17.4 89 Indian Creek 9425 21.7 20.5 106 27.6 23.6 117 Kendall R.S. 7740 .0 .0 * 14.6 16.0 91 Larsen Creek 9000 -M .0 * 17.5 16.5 106 Loomis Park 8240 6.0 4.6 130 18.3 20.4 90 New Fork Lake 8340 -M .0 * -M 13.7 * Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 -M .0 * 18.5 16.1 115 Spring Creek Divide 9000 26.0 21.7 120 33.9 27.5 123 Triple Peak 8500 14.3 12.6 113 28.9 30.2 96 ----- ----- Basin Index (%) 104 102 LOWER GREEN RIVER Blacks Fork Jct 8869 .6 .0 * 16.8 15.1 111 Buck Pasture 9632 10.1 -M * 24.5 -M * EF Blacks Fork GS 9360 .1 .0 * 14.4 14.9 97 Hams Fork 7840 -M .0 * 17.5 14.0 125 Henrys Fork 10182 -M -M * 17.6 -M * Hewinta 9500 .0 .0 * 18.9 17.1 111 Hickerson Park 9122 .0 .0 * 14.3 13.2 108 Hole-in-Rock 9168 .1 .0 * 13.8 13.4 103 Indian Creek 9425 21.7 20.5 106 27.6 23.6 117 Kelley R.S. 8180 9.8 3.2 306 24.9 19.8 126 Spirit Lk 10235 14.4 5.0 288 24.3 20.2 120 Steel Creek Park 10158 16.4 15.4 106 23.2 20.9 111 ----- ----- Basin Index (%) 143* 114 UPPER BEAR RIVER Bear River RS 8777 .0 .0 * 17.9 14.4 124 Bug Lake 7987 17.3 8.4 206 28.4 20.2 141 Burts Miller Ranch 8000 .2 .0 * 15.9 9.3 171 Chalk Creek #1 9171 23.7 15.7 151 35.0 28.4 123 Giveout 6930 .0 .0 * 18.1 15.3 118 Hayden Fork 9130 7.2 .3 2400* 30.8 24.8 124 Kelley R.S. 8180 9.8 3.2 306 24.9 19.8 126 Lily Lake 9133 2.2 .0 * 19.6 20.2 97 Monte Cristo 8932 33.0 17.6 188 43.4 29.8 146 Salt River Summit 7640 5.8 .0 * 23.1 18.9 122 Spring Creek Divide 9000 26.0 21.7 120 33.9 27.5 123 Trial Lake 9992 27.5 18.2 151 38.0 27.0 141 ----- ----- Basin Index (%) 179 129 ----------------------------------------------------------------------------- -M = Missing data * = Data may not provide a valid measure of conditions. Units = inches for the Current and Median (or Average) 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 (or Average) represents the snow water equivalent found at selected SNOTEL sites in or near the basin compared to the Median (or Average) value for those sites on this day. The TOTAL PRECIPITATION Percent of Median (or Average) represents the total precipitation (beginning October 1st) found at selected SNOTEL sites in or near the basin compared to the Median (or Average) value for those sites on this day. Contact your state water supply staff for assistance. Medians and averages are calculated for the period 1991-2020. 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 or average for the day is less than 10% of the maximum median or average value for the year. * Basin - More than half of the stations for a basin with medians (or averages) report missing or invalid data The basin index is calculated as the sum of the valid current values divided by the sum of the corresponding medians or averages 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.