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 MONDAY: MAY 1 , 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 15.6 10.3 151 22.6 22.8 99
Blind Bull Sum 8650 27.3 24.4 112 20.0 19.3 104
Cottonwood Creek 7670 24.3 17.7 137 31.1 28.1 111
East Rim Divide 7930 7.5 6.4 117 13.0 12.4 105
Grand Targhee 9260 50.0 45.6 110 32.1 36.0 89
Granite Creek 6770 14.1 10.0 141 16.2 20.9 78
Grassy Lake 7265 35.2 29.1 121 42.3 38.4 110
Gros Ventre Summit 8750 12.1 12.0 101 11.9 14.4 83
Gunsight Pass 9820 13.8 13.0 106 15.0 16.1 93
Lewis Lake Divide 7850 37.5 30.3 124 42.8 36.7 117
Loomis Park 8240 13.9 11.7 119 18.0 18.4 98
Phillips Bench 8200 29.5 27.5 107 32.1 28.6 112
Salt River Summit 7640 18.8 8.6 219 22.0 17.8 124
Snake River Station 6920 14.5 9.9 146 24.6 24.8 99
Somsen Ranch 6800 16.1 1.4 1150 23.3 17.9 130
Spring Creek Divide 9000 -M 25.2 * -M 25.3 *
Thumb Divide 7980 18.5 13.2 140 20.7 20.7 100
Togwotee Pass 9580 22.4 25.4 88 23.3 27.0 86
Triple Peak 8500 24.8 19.4 128 28.5 28.1 101
Two Ocean Plateau 9240 35.0 33.0 106 30.0 29.4 102
Willow Creek 8080 38.5 27.6 139 40.2 37.0 109
Younts Peak 8350 13.9 14.1 99 14.7 17.2 85
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Basin Index (%) 124 102
MADISON HEADWATERS IN WYOMING
Black Bear 8170 46.1 40.1 115 47.0 40.7 115
Canyon 7870 14.6 -M * 18.8 -M *
Madison Plateau 7750 34.8 23.2 150 31.9 27.6 116
West Yellowstone 6700 10.2 .6 1700* 20.4 15.8 129
Whiskey Creek 6800 21.6 13.8 157 27.7 22.4 124
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Basin Index (%) 145 119
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 20.8 24.0 87 20.4 22.8 89
Canyon 7870 14.6 -M * 18.8 -M *
Evening Star 9200 27.0 27.5 98 31.3 31.2 100
Fisher Creek 9100 37.6 35.4 106 38.2 37.0 103
Monument Peak 8850 23.2 22.2 105 26.7 25.4 105
Northeast Entrance 7350 5.6 3.2 175 13.9 14.5 96
Parker Peak 9400 29.8 23.8 125 26.8 22.6 119
Sylvan Lake 8420 19.9 20.2 99 26.1 26.2 100
Thumb Divide 7980 18.5 13.2 140 20.7 20.7 100
Two Ocean Plateau 9240 35.0 33.0 106 30.0 29.4 102
White Mill 8700 26.2 26.1 100 25.5 25.5 100
Wolverine 7650 10.6 4.5 236 14.4 13.6 106
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Basin Index (%) 109 102
WIND RIVER
Burroughs Creek 8750 7.2 -M * 11.7 -M *
Castle Creek 8400 .6 .2 300* 8.1 9.5 85
Cold Springs 9630 5.5 4.1 134 12.0 11.2 107
Deer Park 9700 26.5 15.5 171 28.6 21.7 132
Hobbs Park 10100 18.4 16.8 110 19.7 16.4 120
Kirwin 9550 11.2 11.6 97 14.7 14.4 102
Little Warm 9370 9.6 9.0 107 14.5 13.2 110
South Pass 9040 20.6 15.0 137 23.2 18.2 127
St. Lawrence Alt 8620 6.5 -M * 12.9 -M *
Togwotee Pass 9580 22.4 25.4 88 23.3 27.0 86
Townsend Creek 8700 13.8 9.0 153 16.9 13.6 124
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Basin Index (%) 121 111
BIGHORN BASIN
Bald Mtn. 9380 20.2 21.0 96 17.2 18.3 94
Bear Trap Meadow 8200 4.5 2.2 205 11.0 11.0 100
Bone Springs Div 9350 17.7 17.6 101 14.0 18.2 77
Grave Springs 8550 8.4 8.7 97 12.7 12.2 104
Kirwin 9550 11.2 11.6 97 14.7 14.4 102
Marquette 8760 9.5 8.0 119 12.2 12.2 100
Middle Powder 7760 11.4 11.4 100 11.5 12.2 94
Owl Creek 8975 2.0 1.2 167 10.4 8.3 125
Powder River Pass 9480 8.7 10.0 87 15.5 15.2 102
Shell Creek 9580 15.2 16.2 94 16.0 15.9 101
Timber Creek 7950 4.4 3.2 138 9.3 10.0 93
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Basin Index (%) 102 98
SHOSHONE RIVER
Blackwater 9780 -M 25.7 * 24.7 25.2 98
Evening Star 9200 27.0 27.5 98 31.3 31.2 100
Marquette 8760 9.5 8.0 119 12.2 12.2 100
Sylvan Lake 8420 19.9 20.2 99 26.1 26.2 100
Sylvan Road 7120 2.4 5.0 48 16.1 18.1 89
Younts Peak 8350 13.9 14.1 99 14.7 17.2 85
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Basin Index (%) 97 96
POWDER RIVER
Bear Trap Meadow 8200 4.5 2.2 205 11.0 11.0 100
Cloud Peak Reservoir 9860 15.2 16.0 95 16.8 17.0 99
Grave Springs 8550 8.4 8.7 97 12.7 12.2 104
Hansen Sawmill 8360 6.6 4.2 157 10.6 10.8 98
Middle Powder 7760 11.4 11.4 100 11.5 12.2 94
Powder River Pass 9480 8.7 10.0 87 15.5 15.2 102
Soldier Park 8720 7.0 4.0 175 10.0 11.4 88
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Basin Index (%) 109 98
TONGUE RIVER
Big Goose 7990 9.7 8.4 115 12.1 13.1 92
Bone Springs Div 9350 17.7 17.6 101 14.0 18.2 77
Burgess Junction 7880 13.2 12.1 109 15.1 14.8 102
Dome Lake 8880 11.2 11.4 98 13.6 15.8 86
Little Goose 8870 9.9 10.2 97 13.7 15.8 87
Sucker Creek 8880 13.2 12.6 105 18.6 17.2 108
Tie Creek 6870 6.1 2.6 235 14.6 13.8 106
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Basin Index (%) 108 94
BELLE FOURCHE
Blind Park 6890 2.0 .3 667* 12.8 13.6 94
Cole Canyon 5910 3.6 1.0 360 12.1 11.5 105
North Rapid Creek 6130 1.3 .3 433* 10.6 10.8 98
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Basin Index (%) 431* 99
CHEYENNE RIVER BASIN
Blind Park 6890 2.0 .3 667* 12.8 13.6 94
North Rapid Creek 6130 1.3 .3 433* 10.6 10.8 98
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Basin Index (%) 550* 96
UPPER N. PLATTE
Arapaho Ridge 10976 28.6 23.2 123 27.4 25.1 109
Blackhall Mtn 9839 37.6 31.1 121 41.2 35.4 116
Cinnabar Park 9707 -M 19.7 * 25.6 27.2 94
Columbine 9167 24.2 17.4 139 29.5 28.6 103
Divide Peak 8730 29.5 16.1 183 31.8 25.0 127
Joe Wright 10158 28.2 22.5 125 31.0 30.2 103
Laprele Creek 8390 10.5 6.5 162 15.4 14.8 104
Med Bow 10512 41.5 -M * 38.4 -M *
Never Summer 10323 27.7 22.2 125 21.1 19.8 107
North French Creek 10153 32.5 32.4 100 33.2 32.8 101
Old Battle 9860 43.7 35.5 123 45.5 38.6 118
Rawah 9069 11.5 6.8 169 19.3 19.0 102
Sage Creek Basin 7850 20.7 1.8 1150 22.0 14.7 150
Sand Lake 10098 31.1 31.2 100 31.6 29.0 109
South Brush Creek 8495 10.1 6.8 149 16.5 16.1 102
Tower 10620 52.6 46.2 114 55.0 45.0 122
Webber Springs 9260 29.9 21.6 138 35.3 29.4 120
Whiskey Park 9020 38.6 27.8 139 38.7 32.6 119
Willow Creek Pass 9523 19.3 15.5 125 19.6 16.0 122
Zirkel 9338 28.4 22.8 125 37.7 34.6 109
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Basin Index (%) 130 112
SWEETWATER
Deer Park 9700 26.5 15.5 171 28.6 21.7 132
Larsen Creek 9000 10.1 3.8 266 16.9 15.8 107
South Pass 9040 20.6 15.0 137 23.2 18.2 127
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Basin Index (%) 167 123
LOWER N. PLATTE
Casper Mtn. 7920 11.3 12.9 88 15.7 17.6 89
Laprele Creek 8390 10.5 6.5 162 15.4 14.8 104
Reno Hill 8430 16.4 13.6 121 19.3 18.5 104
Windy Peak 7915 10.3 4.1 251 14.1 12.6 112
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Basin Index (%) 131 102
LARAMIE RIVER
Brooklyn Lake 10250 25.0 23.0 109 28.7 25.0 115
Cinnabar Park 9707 -M 19.7 * 25.6 27.2 94
Crow Creek 8335 .1 .7 14 10.9 12.4 88
Deadman Hill 10239 21.9 19.8 111 21.5 21.2 101
Rawah 9069 11.5 6.8 169 19.3 19.0 102
Roach 9740 17.6 16.1 109 23.5 21.6 109
Windy Peak 7915 10.3 4.1 251 14.1 12.6 112
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Basin Index (%) 123 103
S. PLATTE
Crow Creek 8335 .1 .7 14 10.9 12.4 88
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Basin Index (%) 14 88
LITTLE SNAKE RIVER
Battle Mountain 7498 9.2 .6 1533* 24.2 17.6 138
Divide Peak 8730 29.5 16.1 183 31.8 25.0 127
Elk River 8739 20.3 12.7 160 30.4 22.8 133
Elkhead Divide 8800 28.4 -M * 33.7 -M *
Little Snake River 8928 37.0 24.4 152 45.7 36.7 125
Old Battle 9860 43.7 35.5 123 45.5 38.6 118
Sage Creek Basin 7850 20.7 1.8 1150 22.0 14.7 150
Sandstone RS 8152 17.2 6.7 257 27.0 20.0 135
Whiskey Park 9020 38.6 27.8 139 38.7 32.6 119
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Basin Index (%) 172 128
UPPER GREEN RIVER
Big Sandy Opening 9080 15.3 11.8 130 17.3 15.0 115
Blind Bull Sum 8650 27.3 24.4 112 20.0 19.3 104
East Rim Divide 7930 7.5 6.4 117 13.0 12.4 105
Elkhart Park G.S. 9400 12.0 11.4 105 13.3 13.8 96
Gros Ventre Summit 8750 12.1 12.0 101 11.9 14.4 83
Gunsight Pass 9820 13.8 13.0 106 15.0 16.1 93
Indian Creek 9425 28.9 22.4 129 26.5 21.2 125
Kendall R.S. 7740 9.1 4.7 194 14.2 14.4 99
Larsen Creek 9000 10.1 3.8 266 16.9 15.8 107
Loomis Park 8240 13.9 11.7 119 18.0 18.4 98
New Fork Lake 8340 8.4 6.2 135 -M 11.9 *
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 11.7 7.2 162 17.3 15.1 115
Spring Creek Divide 9000 -M 25.2 * -M 25.3 *
Triple Peak 8500 24.8 19.4 128 28.5 28.1 101
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Basin Index (%) 126 104
LOWER GREEN RIVER
Blacks Fork Jct 8869 11.8 4.2 281 16.2 14.2 114
Buck Pasture 9632 20.2 -M * 23.8 -M *
EF Blacks Fork GS 9360 11.2 8.1 138 13.5 13.5 100
Hams Fork 7840 11.3 3.0 377 16.1 12.0 134
Henrys Fork 10182 -M -M * 16.8 -M *
Hewinta 9500 9.4 6.2 152 18.1 15.9 114
Hickerson Park 9122 7.9 3.9 203 14.1 12.0 118
Hole-in-Rock 9168 8.1 2.8 289 13.5 11.6 116
Indian Creek 9425 28.9 22.4 129 26.5 21.2 125
Kelley R.S. 8180 20.5 11.2 183 23.8 18.0 132
Spirit Lk 10235 22.6 12.3 184 23.5 19.9 118
Steel Creek Park 10158 21.9 17.2 127 22.3 18.8 119
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Basin Index (%) 168 119
UPPER BEAR RIVER
Bear River RS 8777 8.1 .5 1620* 17.4 13.8 126
Bug Lake 7987 29.5 14.4 205 26.9 19.4 139
Burts Miller Ranch 8000 4.1 .0 * 15.5 8.7 178
Chalk Creek #1 9171 35.6 21.6 165 34.2 25.6 134
Giveout 6930 12.1 .0 * 17.1 13.8 124
Hayden Fork 9130 20.0 9.5 211 30.0 23.1 130
Kelley R.S. 8180 20.5 11.2 183 23.8 18.0 132
Lily Lake 9133 11.3 10.5 108 18.8 18.0 104
Monte Cristo 8932 46.3 24.6 188 41.6 28.0 149
Salt River Summit 7640 18.8 8.6 219 22.0 17.8 124
Spring Creek Divide 9000 -M 25.2 * -M 25.3 *
Trial Lake 9992 38.7 22.9 169 36.7 24.7 149
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Basin Index (%) 198 135
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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.
