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 TUESDAY: MAY 2 , 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 14.8 10.0 148 22.5 22.8 99
Blind Bull Sum 8650 26.4 24.6 107 -M 19.4 *
Cottonwood Creek 7670 23.2 17.4 133 31.1 28.2 110
East Rim Divide 7930 6.4 6.1 105 13.0 12.5 104
Grand Targhee 9260 49.5 45.8 108 -M 36.0 *
Granite Creek 6770 13.1 9.8 134 16.2 21.0 77
Grassy Lake 7265 33.6 28.4 118 42.3 38.4 110
Gros Ventre Summit 8750 11.6 12.0 97 11.9 14.5 82
Gunsight Pass 9820 13.0 13.0 100 15.0 16.2 93
Lewis Lake Divide 7850 36.0 30.2 119 42.8 36.8 116
Loomis Park 8240 13.4 11.6 116 18.0 18.4 98
Phillips Bench 8200 29.0 27.4 106 32.2 28.7 112
Salt River Summit 7640 17.8 8.1 220 22.2 17.8 125
Snake River Station 6920 13.5 9.3 145 24.7 24.8 100
Somsen Ranch 6800 14.8 .8 1850* 23.3 18.2 128
Spring Creek Divide 9000 -M 25.2 * -M 25.4 *
Thumb Divide 7980 17.5 12.7 138 20.8 20.8 100
Togwotee Pass 9580 22.7 25.4 89 23.3 27.0 86
Triple Peak 8500 23.1 19.1 121 28.4 28.4 100
Two Ocean Plateau 9240 34.8 32.2 108 30.0 29.4 102
Willow Creek 8080 36.7 27.6 133 40.2 37.1 108
Younts Peak 8350 13.1 13.8 95 14.8 17.3 86
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Basin Index (%) 120 103
MADISON HEADWATERS IN WYOMING
Black Bear 8170 46.4 39.9 116 45.9 40.7 113
Canyon 7870 14.2 -M * 18.8 -M *
Madison Plateau 7750 33.3 23.2 144 31.9 27.8 115
West Yellowstone 6700 9.0 .3 3000* 20.4 15.8 129
Whiskey Creek 6800 21.1 13.3 159 27.8 22.6 123
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Basin Index (%) 143 118
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 21.0 23.9 88 20.4 22.8 89
Canyon 7870 14.2 -M * 18.8 -M *
Evening Star 9200 26.1 27.0 97 31.3 31.2 100
Fisher Creek 9100 37.2 35.4 105 38.1 37.0 103
Monument Peak 8850 22.4 22.3 100 26.7 25.4 105
Northeast Entrance 7350 4.5 3.0 150 13.9 14.6 95
Parker Peak 9400 29.0 24.0 121 26.9 22.6 119
Sylvan Lake 8420 18.8 19.6 96 26.1 26.2 100
Thumb Divide 7980 17.5 12.7 138 20.8 20.8 100
Two Ocean Plateau 9240 34.8 32.2 108 30.0 29.4 102
White Mill 8700 25.8 26.4 98 25.4 25.6 99
Wolverine 7650 9.4 4.6 204 14.4 13.8 104
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Basin Index (%) 107 102
WIND RIVER
Burroughs Creek 8750 6.5 -M * 11.7 -M *
Castle Creek 8400 .2 .4 50* 8.1 9.6 84
Cold Springs 9630 4.6 4.1 112 12.0 11.3 106
Deer Park 9700 26.2 15.2 172 28.6 21.8 131
Hobbs Park 10100 17.1 16.8 102 19.7 16.5 119
Kirwin 9550 10.6 11.3 94 14.7 14.4 102
Little Warm 9370 9.0 9.4 96 14.6 13.2 111
South Pass 9040 20.4 14.8 138 23.3 18.2 128
St. Lawrence Alt 8620 5.6 -M * 13.0 -M *
Togwotee Pass 9580 22.7 25.4 89 23.3 27.0 86
Townsend Creek 8700 13.4 9.0 149 16.9 13.6 124
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Basin Index (%) 117 111
BIGHORN BASIN
Bald Mtn. 9380 19.8 20.6 96 17.2 18.4 93
Bear Trap Meadow 8200 3.3 1.8 183 11.0 11.0 100
Bone Springs Div 9350 17.3 17.8 97 14.0 18.4 76
Grave Springs 8550 7.6 8.7 87 12.7 12.2 104
Kirwin 9550 10.6 11.3 94 14.7 14.4 102
Marquette 8760 9.1 8.0 114 12.3 12.2 101
Middle Powder 7760 10.8 11.2 96 11.5 12.4 93
Owl Creek 8975 1.3 1.0 130 10.4 8.3 125
Powder River Pass 9480 7.7 10.0 77 15.5 15.2 102
Shell Creek 9580 14.5 16.2 90 16.0 16.0 100
Timber Creek 7950 3.6 3.2 112 9.3 10.2 91
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Basin Index (%) 96 97
SHOSHONE RIVER
Blackwater 9780 -M 25.6 * 24.8 25.6 97
Evening Star 9200 26.1 27.0 97 31.3 31.2 100
Marquette 8760 9.1 8.0 114 12.3 12.2 101
Sylvan Lake 8420 18.8 19.6 96 26.1 26.2 100
Sylvan Road 7120 .8 4.6 17 16.1 18.1 89
Younts Peak 8350 13.1 13.8 95 14.8 17.3 86
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Basin Index (%) 93 96
POWDER RIVER
Bear Trap Meadow 8200 3.3 1.8 183 11.0 11.0 100
Cloud Peak Reservoir 9860 15.3 16.2 94 16.7 17.1 98
Grave Springs 8550 7.6 8.7 87 12.7 12.2 104
Hansen Sawmill 8360 5.6 3.8 147 10.6 11.0 96
Middle Powder 7760 10.8 11.2 96 11.5 12.4 93
Powder River Pass 9480 7.7 10.0 77 15.5 15.2 102
Soldier Park 8720 6.4 3.8 168 10.0 11.4 88
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Basin Index (%) 102 97
TONGUE RIVER
Big Goose 7990 9.1 8.6 106 12.1 13.2 92
Bone Springs Div 9350 17.3 17.8 97 14.0 18.4 76
Burgess Junction 7880 12.9 11.7 110 15.1 14.8 102
Dome Lake 8880 10.6 11.4 93 13.6 16.0 85
Little Goose 8870 9.2 10.2 90 13.7 16.0 86
Sucker Creek 8880 12.4 12.2 102 18.6 17.2 108
Tie Creek 6870 5.4 2.2 245 14.6 13.8 106
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Basin Index (%) 104 93
BELLE FOURCHE
Blind Park 6890 .8 .3 267* 12.8 13.6 94
Cole Canyon 5910 3.1 1.0 310 12.1 11.5 105
North Rapid Creek 6130 .7 .6 117* 10.6 10.8 98
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Basin Index (%) 242* 99
CHEYENNE RIVER BASIN
Blind Park 6890 .8 .3 267* 12.8 13.6 94
North Rapid Creek 6130 .7 .6 117* 10.6 10.8 98
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Basin Index (%) 167* 96
UPPER N. PLATTE
Arapaho Ridge 10976 26.8 23.0 117 27.4 25.2 109
Blackhall Mtn 9839 36.7 31.4 117 41.2 35.6 116
Cinnabar Park 9707 -M 19.1 * 25.6 27.4 93
Columbine 9167 22.5 17.4 129 29.6 28.8 103
Divide Peak 8730 28.1 15.8 178 31.8 25.0 127
Joe Wright 10158 27.5 22.8 121 31.0 30.4 102
Laprele Creek 8390 9.5 6.4 148 15.4 14.8 104
Med Bow 10512 41.5 -M * 38.4 -M *
Never Summer 10323 27.5 22.2 124 21.1 19.8 107
North French Creek 10153 32.0 32.3 99 33.2 32.9 101
Old Battle 9860 42.5 35.4 120 45.5 38.7 118
Rawah 9069 10.7 6.6 162 19.4 19.0 102
Sage Creek Basin 7850 19.0 .8 2375* 22.0 14.7 150
Sand Lake 10098 30.7 31.3 98 31.6 29.1 109
South Brush Creek 8495 8.8 6.6 133 16.6 16.2 102
Tower 10620 52.9 46.4 114 55.0 45.2 122
Webber Springs 9260 28.9 21.2 136 35.3 29.4 120
Whiskey Park 9020 37.2 27.1 137 38.7 32.8 118
Willow Creek Pass 9523 19.0 15.3 124 19.6 16.0 122
Zirkel 9338 26.6 22.5 118 37.7 34.8 108
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Basin Index (%) 127 112
SWEETWATER
Deer Park 9700 26.2 15.2 172 28.6 21.8 131
Larsen Creek 9000 9.2 3.6 256 16.9 16.0 106
South Pass 9040 20.4 14.8 138 23.3 18.2 128
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Basin Index (%) 166 123
LOWER N. PLATTE
Casper Mtn. 7920 10.5 12.4 85 15.7 17.8 88
Laprele Creek 8390 9.5 6.4 148 15.4 14.8 104
Reno Hill 8430 15.9 13.8 115 19.3 18.7 103
Windy Peak 7915 9.5 4.0 238 14.1 12.8 110
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Basin Index (%) 124 101
LARAMIE RIVER
Brooklyn Lake 10250 23.6 23.0 103 28.7 25.0 115
Cinnabar Park 9707 -M 19.1 * 25.6 27.4 93
Crow Creek 8335 .1 .8 12 10.9 12.6 87
Deadman Hill 10239 21.4 19.6 109 21.5 21.2 101
Rawah 9069 10.7 6.6 162 19.4 19.0 102
Roach 9740 17.0 16.4 104 23.5 21.6 109
Windy Peak 7915 9.5 4.0 238 14.1 12.8 110
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Basin Index (%) 117 103
S. PLATTE
Crow Creek 8335 .1 .8 12 10.9 12.6 87
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Basin Index (%) 12 87
LITTLE SNAKE RIVER
Battle Mountain 7498 8.2 .0 * 24.2 17.6 138
Divide Peak 8730 28.1 15.8 178 31.8 25.0 127
Elk River 8739 18.9 12.8 148 30.3 23.0 132
Elkhead Divide 8800 26.6 -M * 33.7 -M *
Little Snake River 8928 35.4 24.5 144 45.7 36.8 124
Old Battle 9860 42.5 35.4 120 45.5 38.7 118
Sage Creek Basin 7850 19.0 .8 2375* 22.0 14.7 150
Sandstone RS 8152 15.8 6.2 255 27.0 20.0 135
Whiskey Park 9020 37.2 27.1 137 38.7 32.8 118
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Basin Index (%) 167 127
UPPER GREEN RIVER
Big Sandy Opening 9080 14.8 11.5 129 17.4 15.0 116
Blind Bull Sum 8650 26.4 24.6 107 -M 19.4 *
East Rim Divide 7930 6.4 6.1 105 13.0 12.5 104
Elkhart Park G.S. 9400 11.2 11.2 100 13.3 13.8 96
Gros Ventre Summit 8750 11.6 12.0 97 11.9 14.5 82
Gunsight Pass 9820 13.0 13.0 100 15.0 16.2 93
Indian Creek 9425 27.8 22.3 125 26.5 21.2 125
Kendall R.S. 7740 8.0 4.4 182 14.2 14.5 98
Larsen Creek 9000 9.2 3.6 256 16.9 16.0 106
Loomis Park 8240 13.4 11.6 116 18.0 18.4 98
New Fork Lake 8340 7.5 5.9 127 -M 12.0 *
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 11.2 7.1 158 17.4 15.2 114
Spring Creek Divide 9000 -M 25.2 * -M 25.4 *
Triple Peak 8500 23.1 19.1 121 28.4 28.4 100
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Basin Index (%) 120 103
LOWER GREEN RIVER
Blacks Fork Jct 8869 11.2 3.9 287 16.2 14.2 114
Buck Pasture 9632 18.9 -M * 23.8 -M *
EF Blacks Fork GS 9360 10.3 8.0 129 13.5 13.6 99
Hams Fork 7840 10.4 2.6 400 16.3 12.0 136
Henrys Fork 10182 -M -M * 16.9 -M *
Hewinta 9500 8.7 5.9 147 18.1 15.9 114
Hickerson Park 9122 7.0 3.6 194 14.0 12.2 115
Hole-in-Rock 9168 7.1 2.4 296 13.4 11.7 115
Indian Creek 9425 27.8 22.3 125 26.5 21.2 125
Kelley R.S. 8180 19.4 11.2 173 24.0 18.0 133
Spirit Lk 10235 21.8 12.5 174 23.5 19.9 118
Steel Creek Park 10158 21.3 17.4 122 22.3 19.0 117
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Basin Index (%) 161 119
UPPER BEAR RIVER
Bear River RS 8777 7.3 .4 1825* 17.4 13.8 126
Bug Lake 7987 28.6 14.2 201 26.9 19.4 139
Burts Miller Ranch 8000 2.9 .0 * 15.6 8.7 179
Chalk Creek #1 9171 34.3 21.9 157 34.2 25.8 133
Giveout 6930 11.4 .0 * 17.2 13.8 125
Hayden Fork 9130 18.2 9.2 198 30.0 23.2 129
Kelley R.S. 8180 19.4 11.2 173 24.0 18.0 133
Lily Lake 9133 11.0 10.4 106 18.8 18.0 104
Monte Cristo 8932 45.5 24.2 188 42.7 28.1 152
Salt River Summit 7640 17.8 8.1 220 22.2 17.8 125
Spring Creek Divide 9000 -M 25.2 * -M 25.4 *
Trial Lake 9992 37.4 22.6 165 36.7 24.8 148
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Basin Index (%) 191 135
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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.
