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 SUNDAY: MAY 21 , 2023
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BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION
Data Site Name (Ft) % %
Current Median Median Current Median Med
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WYOMING
SNAKE RIVER
Base Camp 7060 -M .0 * 22.9 24.6 93
Blind Bull Sum 8650 22.4 21.2 106 20.7 21.0 99
Cottonwood Creek 7670 10.2 6.7 152 33.0 30.0 110
East Rim Divide 7930 -M .0 * 13.4 14.1 95
Grand Targhee 9260 40.3 43.4 93 33.8 38.4 88
Granite Creek 6770 -M .0 * 17.4 22.6 77
Grassy Lake 7265 19.8 14.9 133 43.4 41.4 105
Gros Ventre Summit 8750 .9 4.6 20 11.7 15.6 75
Gunsight Pass 9820 5.9 9.6 61 15.6 17.4 90
Lewis Lake Divide 7850 22.7 21.4 106 43.4 39.3 110
Loomis Park 8240 1.9 .7 271* 18.3 20.6 89
Phillips Bench 8200 17.5 18.8 93 32.9 31.2 105
Salt River Summit 7640 .6 .0 * 23.2 19.0 122
Snake River Station 6920 .0 .0 * 25.0 26.9 93
Somsen Ranch 6800 -M .0 * 23.9 19.8 121
Spring Creek Divide 9000 23.4 20.4 115 34.1 28.0 122
Thumb Divide 7980 2.8 .2 1400* 21.5 22.4 96
Togwotee Pass 9580 15.0 22.6 66 24.5 29.4 83
Triple Peak 8500 10.5 9.7 108 29.0 30.6 95
Two Ocean Plateau 9240 26.8 28.7 93 31.0 31.4 99
Willow Creek 8080 17.3 16.4 105 41.7 40.4 103
Younts Peak 8350 .0 6.3 0 15.4 18.8 82
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Basin Index (%) 97 99
MADISON HEADWATERS IN WYOMING
Black Bear 8170 39.1 34.0 115 47.5 43.0 110
Canyon 7870 2.2 -M * 20.0 -M *
Madison Plateau 7750 20.3 13.6 149 32.9 30.7 107
West Yellowstone 6700 .0 .0 * 20.9 17.0 123
Whiskey Creek 6800 12.0 4.3 279 28.5 24.6 116
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Basin Index (%) 138 113
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 17.4 22.1 79 21.3 25.4 84
Canyon 7870 2.2 -M * 20.0 -M *
Evening Star 9200 17.6 21.9 80 32.4 34.0 95
Fisher Creek 9100 30.3 35.2 86 39.2 41.0 96
Monument Peak 8850 11.3 17.4 65 27.4 27.6 99
Northeast Entrance 7350 .0 .0 * 14.4 16.3 88
Parker Peak 9400 16.2 18.3 89 27.7 24.4 114
Sylvan Lake 8420 6.3 11.8 53 26.9 28.2 95
Thumb Divide 7980 2.8 .2 1400* 21.5 22.4 96
Two Ocean Plateau 9240 26.8 28.7 93 31.0 31.4 99
White Mill 8700 18.3 22.8 80 26.4 27.6 96
Wolverine 7650 .0 .0 * 15.0 15.6 96
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Basin Index (%) 82 96
WIND RIVER
Burroughs Creek 8750 .0 -M * 12.2 -M *
Castle Creek 8400 .0 .0 * 8.8 11.9 74
Cold Springs 9630 .1 .0 * 13.2 13.6 97
Deer Park 9700 16.7 9.6 174 30.0 24.3 123
Hobbs Park 10100 14.1 13.7 103 22.3 19.2 116
Kirwin 9550 .7 8.0 9 16.8 17.2 98
Little Warm 9370 .0 1.8 0 15.2 15.7 97
South Pass 9040 10.8 7.6 142 25.3 20.6 123
St. Lawrence Alt 8620 .0 -M * 14.9 -M *
Togwotee Pass 9580 15.0 22.6 66 24.5 29.4 83
Townsend Creek 8700 2.5 .4 625* 19.4 16.1 120
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Basin Index (%) 94 104
BIGHORN BASIN
Bald Mtn. 9380 13.0 18.4 71 18.4 20.4 90
Bear Trap Meadow 8200 .0 .0 * 13.1 12.8 102
Bone Springs Div 9350 8.6 13.8 62 15.7 19.6 80
Grave Springs 8550 .0 1.2 0 15.2 13.4 113
Kirwin 9550 .7 8.0 9 16.8 17.2 98
Marquette 8760 .0 3.1 0 14.6 15.6 94
Middle Powder 7760 .0 2.8 0 14.1 14.3 99
Owl Creek 8975 .0 .0 * 11.6 9.8 118
Powder River Pass 9480 .0 5.0 0 16.8 17.4 97
Shell Creek 9580 9.4 14.2 66 17.1 17.9 96
Timber Creek 7950 .1 .0 * 11.1 12.5 89
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Basin Index (%) 48 96
SHOSHONE RIVER
Blackwater 9780 17.8 22.4 79 26.3 28.2 93
Evening Star 9200 17.6 21.9 80 32.4 34.0 95
Marquette 8760 .0 3.1 0 14.6 15.6 94
Sylvan Lake 8420 6.3 11.8 53 26.9 28.2 95
Sylvan Road 7120 .0 .0 * 16.4 19.4 85
Younts Peak 8350 .0 6.3 0 15.4 18.8 82
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Basin Index (%) 64 92
POWDER RIVER
Bear Trap Meadow 8200 .0 .0 * 13.1 12.8 102
Cloud Peak Reservoir 9860 11.2 12.0 93 20.1 20.0 100
Grave Springs 8550 .0 1.2 0 15.2 13.4 113
Hansen Sawmill 8360 .0 .0 * 12.8 13.2 97
Middle Powder 7760 .0 2.8 0 14.1 14.3 99
Powder River Pass 9480 .0 5.0 0 16.8 17.4 97
Soldier Park 8720 .0 .1 0* 12.4 13.2 94
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Basin Index (%) 53 100
TONGUE RIVER
Big Goose 7990 .1 3.0 3 14.4 16.4 88
Bone Springs Div 9350 8.6 13.8 62 15.7 19.6 80
Burgess Junction 7880 3.7 5.8 64 17.3 16.8 103
Dome Lake 8880 .7 5.6 12 15.4 19.8 78
Little Goose 8870 .3 5.5 5 16.1 18.0 89
Sucker Creek 8880 2.6 7.6 34 20.5 21.2 97
Tie Creek 6870 .0 .0 * 16.7 17.0 98
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Basin Index (%) 39 90
BELLE FOURCHE
Blind Park 6890 .0 .0 * 14.3 15.2 94
Cole Canyon 5910 .0 .0 * 14.2 14.0 101
North Rapid Creek 6130 .1 .0 * 12.8 13.4 96
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Basin Index (%) * 97
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 14.3 15.2 94
North Rapid Creek 6130 .1 .0 * 12.8 13.4 96
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Basin Index (%) * 95
UPPER N. PLATTE
Arapaho Ridge 10976 20.2 19.1 106 29.6 28.4 104
Blackhall Mtn 9839 25.5 28.8 89 42.8 39.5 108
Cinnabar Park 9707 -M 11.5 * 27.1 28.9 94
Columbine 9167 2.1 .4 525* 31.2 31.2 100
Divide Peak 8730 7.7 4.5 171 33.1 25.9 128
Joe Wright 10158 19.5 18.8 104 33.0 33.9 97
Laprele Creek 8390 .0 .0 * 16.8 16.8 100
Med Bow 10512 36.4 -M * 40.5 -M *
Never Summer 10323 23.8 19.9 120 23.4 22.4 104
North French Creek 10153 20.6 28.3 73 34.4 36.1 95
Old Battle 9860 38.8 32.6 119 46.8 42.0 111
Rawah 9069 .0 .4 0* 20.9 20.4 102
Sage Creek Basin 7850 -M .0 * 22.8 16.7 137
Sand Lake 10098 26.3 27.4 96 34.2 32.4 106
South Brush Creek 8495 .2 .0 * 17.5 19.0 92
Tower 10620 47.7 42.2 113 56.8 49.4 115
Webber Springs 9260 17.6 9.8 180 35.9 32.2 111
Whiskey Park 9020 20.4 21.4 95 39.3 36.0 109
Willow Creek Pass 9523 11.6 10.6 109 21.2 17.8 119
Zirkel 9338 6.6 9.0 73 38.2 35.9 106
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Basin Index (%) 106 107
SWEETWATER
Deer Park 9700 16.7 9.6 174 30.0 24.3 123
Larsen Creek 9000 -M .0 * 17.9 16.9 106
South Pass 9040 10.8 7.6 142 25.3 20.6 123
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Basin Index (%) 160 118
LOWER N. PLATTE
Casper Mtn. 7920 .0 2.4 0 21.3 19.0 112
Laprele Creek 8390 .0 .0 * 16.8 16.8 100
Reno Hill 8430 3.5 3.8 92 22.8 21.9 104
Windy Peak 7915 .0 .0 * 15.7 14.6 108
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Basin Index (%) 56 106
LARAMIE RIVER
Brooklyn Lake 10250 10.4 15.4 68 30.5 28.0 109
Cinnabar Park 9707 -M 11.5 * 27.1 28.9 94
Crow Creek 8335 .0 .0 * 13.0 14.5 90
Deadman Hill 10239 15.0 15.8 95 24.8 24.0 103
Rawah 9069 .0 .4 0* 20.9 20.4 102
Roach 9740 8.5 9.4 90 26.0 24.2 107
Windy Peak 7915 .0 .0 * 15.7 14.6 108
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Basin Index (%) 83* 102
S. PLATTE
Crow Creek 8335 .0 .0 * 13.0 14.5 90
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Basin Index (%) * 90
LITTLE SNAKE RIVER
Battle Mountain 7498 -M .0 * 24.4 19.2 127
Divide Peak 8730 7.7 4.5 171 33.1 25.9 128
Elk River 8739 .6 .0 * 30.3 23.7 128
Elkhead Divide 8800 8.9 -M * 34.2 -M *
Little Snake River 8928 19.0 12.0 158 46.9 39.6 118
Old Battle 9860 38.8 32.6 119 46.8 42.0 111
Sage Creek Basin 7850 -M .0 * 22.8 16.7 137
Sandstone RS 8152 .0 .0 * 27.5 21.7 127
Whiskey Park 9020 20.4 21.4 95 39.3 36.0 109
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Basin Index (%) 123 121
UPPER GREEN RIVER
Big Sandy Opening 9080 3.5 1.6 219 18.7 16.4 114
Blind Bull Sum 8650 22.4 21.2 106 20.7 21.0 99
East Rim Divide 7930 -M .0 * 13.4 14.1 95
Elkhart Park G.S. 9400 .8 4.2 19 13.9 16.4 85
Gros Ventre Summit 8750 .9 4.6 20 11.7 15.6 75
Gunsight Pass 9820 5.9 9.6 61 15.6 17.4 90
Indian Creek 9425 18.8 17.8 106 27.6 24.1 115
Kendall R.S. 7740 .0 .0 * 14.8 16.2 91
Larsen Creek 9000 -M .0 * 17.9 16.9 106
Loomis Park 8240 1.9 .7 271* 18.3 20.6 89
New Fork Lake 8340 -M .0 * -M 13.7 *
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 -M .0 * 18.5 16.4 113
Spring Creek Divide 9000 23.4 20.4 115 34.1 28.0 122
Triple Peak 8500 10.5 9.7 108 29.0 30.6 95
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Basin Index (%) 98 100
LOWER GREEN RIVER
Blacks Fork Jct 8869 .4 .0 * 16.8 15.2 111
Buck Pasture 9632 6.6 -M * 24.7 -M *
EF Blacks Fork GS 9360 -M .0 * 14.8 16.2 91
Hams Fork 7840 -M .0 * 17.6 14.2 124
Henrys Fork 10182 -M -M * 17.6 -M *
Hewinta 9500 .0 .0 * 19.0 17.2 110
Hickerson Park 9122 .0 .0 * 14.4 13.4 107
Hole-in-Rock 9168 .1 .0 * 14.1 13.4 105
Indian Creek 9425 18.8 17.8 106 27.6 24.1 115
Kelley R.S. 8180 6.1 1.6 381 25.0 20.4 123
Spirit Lk 10235 11.4 3.2 356 24.6 20.5 120
Steel Creek Park 10158 14.3 13.6 105 23.2 21.0 110
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Basin Index (%) 141* 112
UPPER BEAR RIVER
Bear River RS 8777 .0 .0 * 18.0 14.8 122
Bug Lake 7987 12.8 3.6 356 28.4 20.4 139
Burts Miller Ranch 8000 .2 .0 * 16.0 9.5 168
Chalk Creek #1 9171 19.3 11.8 164 35.2 28.8 122
Giveout 6930 .0 .0 * 18.5 16.0 116
Hayden Fork 9130 3.1 .0 * 30.8 24.8 124
Kelley R.S. 8180 6.1 1.6 381 25.0 20.4 123
Lily Lake 9133 .4 .0 * 19.7 20.5 96
Monte Cristo 8932 28.0 14.2 197 43.4 29.8 146
Salt River Summit 7640 .6 .0 * 23.2 19.0 122
Spring Creek Divide 9000 23.4 20.4 115 34.1 28.0 122
Trial Lake 9992 24.4 13.8 177 38.0 27.1 140
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Basin Index (%) 181 127
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-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.
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-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.