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 THURSDAY: MAY 18 , 2023 ------------------------------------------------------------------------------ BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION Data Site Name (Ft) % % Current Median Median Current Median Med ------------------------------------------------------------------------------ WYOMING SNAKE RIVER Base Camp 7060 2.9 .0 * 23.0 24.4 94 Blind Bull Sum 8650 25.4 22.5 113 20.7 20.8 100 Cottonwood Creek 7670 14.2 9.2 154 32.9 30.0 110 East Rim Divide 7930 -M .0 * 13.5 13.9 97 Grand Targhee 9260 42.8 44.0 97 33.8 37.8 89 Granite Creek 6770 2.2 .5 440* 16.8 22.4 75 Grassy Lake 7265 23.3 18.3 127 43.4 41.2 105 Gros Ventre Summit 8750 3.6 6.8 53 11.8 15.4 77 Gunsight Pass 9820 8.3 11.0 75 15.6 17.4 90 Lewis Lake Divide 7850 26.3 22.8 115 43.4 39.2 111 Loomis Park 8240 5.1 3.9 131 18.3 20.5 89 Phillips Bench 8200 20.2 20.4 99 32.9 31.0 106 Salt River Summit 7640 4.7 .0 * 23.1 18.9 122 Snake River Station 6920 .0 .0 * 25.0 26.8 93 Somsen Ranch 6800 -M .0 * 23.9 19.6 122 Spring Creek Divide 9000 25.6 21.1 121 34.1 27.6 124 Thumb Divide 7980 6.3 2.2 286 21.5 22.3 96 Togwotee Pass 9580 18.2 23.2 78 24.5 29.0 84 Triple Peak 8500 13.9 12.0 116 29.0 30.3 96 Two Ocean Plateau 9240 28.3 30.4 93 31.0 31.2 99 Willow Creek 8080 21.7 18.6 117 41.7 40.2 104 Younts Peak 8350 .1 8.8 1 15.5 18.4 84 ----- ----- Basin Index (%) 106 99 MADISON HEADWATERS IN WYOMING Black Bear 8170 42.2 36.0 117 47.5 42.8 111 Canyon 7870 5.8 -M * 20.0 -M * Madison Plateau 7750 22.8 15.8 144 32.9 30.6 108 West Yellowstone 6700 .0 .0 * 20.9 16.8 124 Whiskey Creek 6800 14.1 6.0 235 28.6 24.4 117 ----- ----- Basin Index (%) 137 113 YELLOWSTONE HEADWATERS IN WYOMING Beartooth Lake 9360 19.0 23.7 80 21.2 25.2 84 Canyon 7870 5.8 -M * 20.0 -M * Evening Star 9200 20.6 24.0 86 32.4 33.8 96 Fisher Creek 9100 31.0 36.0 86 39.3 40.9 96 Monument Peak 8850 14.0 19.6 71 27.5 27.2 101 Northeast Entrance 7350 .0 .0 * 14.4 16.2 89 Parker Peak 9400 18.9 19.8 95 27.6 24.0 115 Sylvan Lake 8420 9.6 13.7 70 26.9 28.0 96 Thumb Divide 7980 6.3 2.2 286 21.5 22.3 96 Two Ocean Plateau 9240 28.3 30.4 93 31.0 31.2 99 White Mill 8700 21.0 24.0 88 26.5 27.6 96 Wolverine 7650 .0 .0 * 15.1 15.4 98 ----- ----- Basin Index (%) 87 97 WIND RIVER Burroughs Creek 8750 .0 -M * 12.1 -M * Castle Creek 8400 .0 .0 * 8.5 11.8 72 Cold Springs 9630 .0 .0 * 13.0 13.5 96 Deer Park 9700 18.7 11.4 164 30.0 23.5 128 Hobbs Park 10100 15.5 15.4 101 22.0 18.8 117 Kirwin 9550 4.3 10.1 43 16.6 16.6 100 Little Warm 9370 .3 4.2 7 15.2 15.5 98 South Pass 9040 12.6 9.2 137 25.0 20.2 124 St. Lawrence Alt 8620 .0 -M * 14.7 -M * Togwotee Pass 9580 18.2 23.2 78 24.5 29.0 84 Townsend Creek 8700 5.1 1.6 319 19.2 15.7 122 ----- ----- Basin Index (%) 99 106 BIGHORN BASIN Bald Mtn. 9380 15.1 19.2 79 18.5 20.3 91 Bear Trap Meadow 8200 .0 .0 * 13.1 12.6 104 Bone Springs Div 9350 11.1 15.1 74 15.6 19.5 80 Grave Springs 8550 .0 4.4 0 15.2 13.3 114 Kirwin 9550 4.3 10.1 43 16.6 16.6 100 Marquette 8760 1.8 4.9 37 14.4 15.1 95 Middle Powder 7760 .0 4.8 0 14.2 14.0 101 Owl Creek 8975 .0 .0 * 11.6 9.6 121 Powder River Pass 9480 .0 7.2 0 16.8 17.4 97 Shell Creek 9580 11.2 15.0 75 17.1 17.6 97 Timber Creek 7950 .2 .0 * 11.0 12.2 90 ----- ----- Basin Index (%) 54 98 SHOSHONE RIVER Blackwater 9780 20.1 23.0 87 26.1 27.8 94 Evening Star 9200 20.6 24.0 86 32.4 33.8 96 Marquette 8760 1.8 4.9 37 14.4 15.1 95 Sylvan Lake 8420 9.6 13.7 70 26.9 28.0 96 Sylvan Road 7120 .0 .0 * 16.6 19.3 86 Younts Peak 8350 .1 8.8 1 15.5 18.4 84 ----- ----- Basin Index (%) 70 93 POWDER RIVER Bear Trap Meadow 8200 .0 .0 * 13.1 12.6 104 Cloud Peak Reservoir 9860 13.0 14.6 89 20.2 19.7 103 Grave Springs 8550 .0 4.4 0 15.2 13.3 114 Hansen Sawmill 8360 .0 .1 0* 12.9 13.2 98 Middle Powder 7760 .0 4.8 0 14.2 14.0 101 Powder River Pass 9480 .0 7.2 0 16.8 17.4 97 Soldier Park 8720 .1 .0 * 12.4 12.8 97 ----- ----- Basin Index (%) 42 102 TONGUE RIVER Big Goose 7990 1.8 5.7 32 14.4 16.3 88 Bone Springs Div 9350 11.1 15.1 74 15.6 19.5 80 Burgess Junction 7880 6.3 8.2 77 17.4 16.5 105 Dome Lake 8880 3.4 7.6 45 15.2 19.5 78 Little Goose 8870 2.8 7.4 38 16.2 17.6 92 Sucker Creek 8880 5.5 8.6 64 20.4 20.6 99 Tie Creek 6870 .0 .0 * 16.6 16.4 101 ----- ----- Basin Index (%) 59 92 BELLE FOURCHE Blind Park 6890 .0 .0 * 14.3 14.8 97 Cole Canyon 5910 .0 .0 * 14.1 14.0 101 North Rapid Creek 6130 .1 .0 * 12.9 12.7 102 ----- ----- Basin Index (%) * 100 CHEYENNE RIVER BASIN Blind Park 6890 .0 .0 * 14.3 14.8 97 North Rapid Creek 6130 .1 .0 * 12.9 12.7 102 ----- ----- Basin Index (%) * 99 UPPER N. PLATTE Arapaho Ridge 10976 21.8 19.3 113 29.4 28.2 104 Blackhall Mtn 9839 28.7 27.5 104 42.7 39.2 109 Cinnabar Park 9707 -M 14.0 * 26.8 27.9 96 Columbine 9167 6.0 3.8 158 31.2 31.0 101 Divide Peak 8730 11.5 6.4 180 32.9 25.8 128 Joe Wright 10158 20.6 20.2 102 32.7 33.1 99 Laprele Creek 8390 .1 .0 * 16.8 16.4 102 Med Bow 10512 38.5 -M * 40.4 -M * Never Summer 10323 24.3 20.4 119 23.3 21.9 106 North French Creek 10153 23.2 30.8 75 34.4 35.7 96 Old Battle 9860 39.7 34.0 117 46.7 41.6 112 Rawah 9069 .1 .2 50* 20.8 20.2 103 Sage Creek Basin 7850 -M .0 * 22.7 16.4 138 Sand Lake 10098 27.9 29.0 96 34.2 31.6 108 South Brush Creek 8495 .2 .0 * 17.4 19.0 92 Tower 10620 52.9 45.4 117 56.8 49.0 116 Webber Springs 9260 20.1 11.9 169 35.9 32.0 112 Whiskey Park 9020 26.3 23.2 113 39.2 35.5 110 Willow Creek Pass 9523 13.1 11.0 119 21.1 17.6 120 Zirkel 9338 10.1 10.2 99 38.3 35.6 108 ----- ----- Basin Index (%) 111 108 SWEETWATER Deer Park 9700 18.7 11.4 164 30.0 23.5 128 Larsen Creek 9000 -M .0 * 17.5 16.6 105 South Pass 9040 12.6 9.2 137 25.0 20.2 124 ----- ----- Basin Index (%) 152 120 LOWER N. PLATTE Casper Mtn. 7920 .2 3.8 5 21.3 18.8 113 Laprele Creek 8390 .1 .0 * 16.8 16.4 102 Reno Hill 8430 6.4 7.9 81 22.7 21.6 105 Windy Peak 7915 .0 .0 * 15.4 14.4 107 ----- ----- Basin Index (%) 57 107 LARAMIE RIVER Brooklyn Lake 10250 13.2 18.0 73 30.5 27.5 111 Cinnabar Park 9707 -M 14.0 * 26.8 27.9 96 Crow Creek 8335 .1 .0 * 12.7 14.0 91 Deadman Hill 10239 16.8 17.3 97 24.7 23.8 104 Rawah 9069 .1 .2 50* 20.8 20.2 103 Roach 9740 10.0 10.4 96 25.7 24.2 106 Windy Peak 7915 .0 .0 * 15.4 14.4 107 ----- ----- Basin Index (%) 88* 103 S. PLATTE Crow Creek 8335 .1 .0 * 12.7 14.0 91 ----- ----- Basin Index (%) * 91 LITTLE SNAKE RIVER Battle Mountain 7498 .0 .0 * 24.4 18.6 131 Divide Peak 8730 11.5 6.4 180 32.9 25.8 128 Elk River 8739 3.4 .2 1700* 30.4 23.7 128 Elkhead Divide 8800 12.0 -M * 34.2 -M * Little Snake River 8928 23.0 13.1 176 46.8 39.4 119 Old Battle 9860 39.7 34.0 117 46.7 41.6 112 Sage Creek Basin 7850 -M .0 * 22.7 16.4 138 Sandstone RS 8152 .7 .0 * 27.5 21.6 127 Whiskey Park 9020 26.3 23.2 113 39.2 35.5 110 ----- ----- Basin Index (%) 136 122 UPPER GREEN RIVER Big Sandy Opening 9080 6.4 5.6 114 18.6 16.0 116 Blind Bull Sum 8650 25.4 22.5 113 20.7 20.8 100 East Rim Divide 7930 -M .0 * 13.5 13.9 97 Elkhart Park G.S. 9400 4.1 6.8 60 13.8 16.0 86 Gros Ventre Summit 8750 3.6 6.8 53 11.8 15.4 77 Gunsight Pass 9820 8.3 11.0 75 15.6 17.4 90 Indian Creek 9425 21.1 20.0 106 27.6 23.8 116 Kendall R.S. 7740 .0 .0 * 14.6 16.0 91 Larsen Creek 9000 -M .0 * 17.5 16.6 105 Loomis Park 8240 5.1 3.9 131 18.3 20.5 89 New Fork Lake 8340 -M .0 * -M 13.7 * Pocket Creek 9360 -M -M * -M -M * Snider Basin 8060 -M .0 * 18.6 16.1 116 Spring Creek Divide 9000 25.6 21.1 121 34.1 27.6 124 Triple Peak 8500 13.9 12.0 116 29.0 30.3 96 ----- ----- Basin Index (%) 103 101 LOWER GREEN RIVER Blacks Fork Jct 8869 .0 .0 * 16.8 15.1 111 Buck Pasture 9632 9.3 -M * 24.5 -M * EF Blacks Fork GS 9360 .0 .0 * 14.5 15.1 96 Hams Fork 7840 -M .0 * 17.6 14.0 126 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 .0 .0 * 13.8 13.4 103 Indian Creek 9425 21.1 20.0 106 27.6 23.8 116 Kelley R.S. 8180 9.0 2.9 310 25.0 20.0 125 Spirit Lk 10235 13.5 4.3 314 24.3 20.2 120 Steel Creek Park 10158 15.9 15.1 105 23.2 21.0 110 ----- ----- Basin Index (%) 141* 113 UPPER BEAR RIVER Bear River RS 8777 .0 .0 * 17.9 14.4 124 Bug Lake 7987 16.3 7.2 226 28.4 20.2 141 Burts Miller Ranch 8000 .0 .0 * 15.9 9.4 169 Chalk Creek #1 9171 22.4 14.4 156 35.1 28.5 123 Giveout 6930 .1 .0 * 18.3 15.3 120 Hayden Fork 9130 6.2 .0 * 30.8 24.8 124 Kelley R.S. 8180 9.0 2.9 310 25.0 20.0 125 Lily Lake 9133 1.1 .0 * 19.6 20.2 97 Monte Cristo 8932 31.5 16.7 189 43.4 29.8 146 Salt River Summit 7640 4.7 .0 * 23.1 18.9 122 Spring Creek Divide 9000 25.6 21.1 121 34.1 27.6 124 Trial Lake 9992 27.0 17.3 156 38.0 27.0 141 ----- ----- Basin Index (%) 181 129 ----------------------------------------------------------------------------- -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.