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: APRIL 30 , 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 16.3 10.7 152 22.6 22.4 101
Blind Bull Sum 8650 27.9 24.4 114 20.0 19.2 104
Cottonwood Creek 7670 25.6 17.4 147 31.1 27.8 112
East Rim Divide 7930 8.6 6.7 128 13.0 12.4 105
Grand Targhee 9260 50.4 46.9 107 -M 36.0 *
Granite Creek 6770 15.2 9.8 155 16.2 20.8 78
Grassy Lake 7265 36.3 29.6 123 42.3 38.3 110
Gros Ventre Summit 8750 12.4 12.2 102 12.0 14.3 84
Gunsight Pass 9820 14.5 12.9 112 14.9 16.0 93
Lewis Lake Divide 7850 38.3 30.4 126 42.8 36.4 118
Loomis Park 8240 14.4 11.8 122 18.0 18.3 98
Phillips Bench 8200 30.0 27.7 108 32.2 28.4 113
Salt River Summit 7640 19.7 9.0 219 22.0 17.8 124
Snake River Station 6920 15.7 10.0 157 24.7 24.4 101
Somsen Ranch 6800 17.2 2.2 782 23.3 17.9 130
Spring Creek Divide 9000 -M 25.2 * -M 25.2 *
Thumb Divide 7980 19.7 13.6 145 20.8 20.6 101
Togwotee Pass 9580 23.3 25.4 92 23.3 26.8 87
Triple Peak 8500 26.0 19.6 133 28.5 27.9 102
Two Ocean Plateau 9240 35.2 33.2 106 30.0 29.2 103
Willow Creek 8080 39.9 27.6 145 40.2 36.6 110
Younts Peak 8350 14.7 14.6 101 14.7 17.1 86
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Basin Index (%) 127 104
MADISON HEADWATERS IN WYOMING
Black Bear 8170 45.9 40.0 115 46.9 40.6 116
Canyon 7870 14.9 -M * 18.8 -M *
Madison Plateau 7750 35.0 23.0 152 31.9 27.6 116
West Yellowstone 6700 11.6 .7 1657* 20.4 15.6 131
Whiskey Creek 6800 22.0 14.1 156 27.7 22.4 124
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Basin Index (%) 147 119
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 20.6 24.0 86 20.4 22.6 90
Canyon 7870 14.9 -M * 18.8 -M *
Evening Star 9200 27.5 27.4 100 31.3 31.1 101
Fisher Creek 9100 37.5 35.5 106 38.2 36.3 105
Monument Peak 8850 23.8 22.2 107 26.8 24.9 108
Northeast Entrance 7350 6.5 3.4 191 13.9 14.2 98
Parker Peak 9400 30.2 23.6 128 26.8 22.5 119
Sylvan Lake 8420 20.6 20.4 101 26.1 26.0 100
Thumb Divide 7980 19.7 13.6 145 20.8 20.6 101
Two Ocean Plateau 9240 35.2 33.2 106 30.0 29.2 103
White Mill 8700 26.3 25.8 102 25.5 25.2 101
Wolverine 7650 11.5 4.6 250 14.4 13.6 106
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Basin Index (%) 111 103
WIND RIVER
Burroughs Creek 8750 8.0 -M * 11.7 -M *
Castle Creek 8400 1.8 .2 900* 8.1 9.4 86
Cold Springs 9630 6.3 3.8 166 12.1 11.2 108
Deer Park 9700 26.1 15.4 169 28.6 21.6 132
Hobbs Park 10100 19.1 16.4 116 19.7 16.1 122
Kirwin 9550 11.6 11.8 98 14.7 14.2 104
Little Warm 9370 10.2 9.0 113 14.5 13.2 110
South Pass 9040 20.7 14.9 139 23.0 18.2 126
St. Lawrence Alt 8620 7.3 -M * 12.9 -M *
Togwotee Pass 9580 23.3 25.4 92 23.3 26.8 87
Townsend Creek 8700 13.7 8.8 156 16.9 13.4 126
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Basin Index (%) 126 112
BIGHORN BASIN
Bald Mtn. 9380 19.7 21.0 94 17.2 18.3 94
Bear Trap Meadow 8200 5.5 2.7 204 11.0 10.7 103
Bone Springs Div 9350 17.4 17.6 99 14.0 18.0 78
Grave Springs 8550 9.0 8.2 110 12.7 12.0 106
Kirwin 9550 11.6 11.8 98 14.7 14.2 104
Marquette 8760 9.6 8.2 117 12.3 11.9 103
Middle Powder 7760 12.0 11.6 103 11.4 12.0 95
Owl Creek 8975 2.6 1.4 186 10.4 8.2 127
Powder River Pass 9480 9.1 10.2 89 15.5 15.2 102
Shell Creek 9580 15.1 16.2 93 16.1 15.8 102
Timber Creek 7950 5.2 3.1 168 9.3 9.6 97
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Basin Index (%) 104 99
SHOSHONE RIVER
Blackwater 9780 23.6 25.4 93 24.7 24.9 99
Evening Star 9200 27.5 27.4 100 31.3 31.1 101
Marquette 8760 9.6 8.2 117 12.3 11.9 103
Sylvan Lake 8420 20.6 20.4 101 26.1 26.0 100
Sylvan Road 7120 3.8 5.6 68 16.2 18.0 90
Younts Peak 8350 14.7 14.6 101 14.7 17.1 86
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Basin Index (%) 98 97
POWDER RIVER
Bear Trap Meadow 8200 5.5 2.7 204 11.0 10.7 103
Cloud Peak Reservoir 9860 15.8 15.4 103 16.8 16.4 102
Grave Springs 8550 9.0 8.2 110 12.7 12.0 106
Hansen Sawmill 8360 7.1 4.0 178 10.6 10.8 98
Middle Powder 7760 12.0 11.6 103 11.4 12.0 95
Powder River Pass 9480 9.1 10.2 89 15.5 15.2 102
Soldier Park 8720 7.3 4.0 182 10.0 11.3 88
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Basin Index (%) 117 100
TONGUE RIVER
Big Goose 7990 10.0 8.6 116 12.2 12.6 97
Bone Springs Div 9350 17.4 17.6 99 14.0 18.0 78
Burgess Junction 7880 13.4 12.2 110 15.2 14.7 103
Dome Lake 8880 11.5 11.1 104 13.6 15.8 86
Little Goose 8870 10.4 10.3 101 13.7 15.6 88
Sucker Creek 8880 13.7 12.4 110 18.6 16.9 110
Tie Creek 6870 6.8 2.5 272 14.6 13.6 107
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Basin Index (%) 111 95
BELLE FOURCHE
Blind Park 6890 2.7 .2 1350* 12.8 13.2 97
Cole Canyon 5910 4.0 1.0 400 12.1 11.5 105
North Rapid Creek 6130 2.2 .4 550* 10.6 10.7 99
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Basin Index (%) 556* 100
CHEYENNE RIVER BASIN
Blind Park 6890 2.7 .2 1350* 12.8 13.2 97
North Rapid Creek 6130 2.2 .4 550* 10.6 10.7 99
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Basin Index (%) 817* 98
UPPER N. PLATTE
Arapaho Ridge 10976 28.8 23.7 122 27.4 25.0 110
Blackhall Mtn 9839 38.7 31.5 123 41.2 34.7 119
Cinnabar Park 9707 -M 19.1 * 25.6 26.9 95
Columbine 9167 25.7 17.2 149 29.4 28.6 103
Divide Peak 8730 30.0 17.3 173 31.8 24.8 128
Joe Wright 10158 28.2 22.1 128 31.0 29.8 104
Laprele Creek 8390 11.0 6.4 172 15.4 14.6 105
Med Bow 10512 41.8 -M * 38.5 -M *
Never Summer 10323 27.7 22.2 125 21.1 19.4 109
North French Creek 10153 32.6 32.3 101 33.2 32.4 102
Old Battle 9860 44.9 35.4 127 45.5 38.3 119
Rawah 9069 12.2 7.0 174 19.4 19.0 102
Sage Creek Basin 7850 21.7 2.1 1033 22.0 14.5 152
Sand Lake 10098 31.3 31.1 101 31.6 29.0 109
South Brush Creek 8495 11.1 7.0 159 16.4 16.0 102
Tower 10620 52.6 46.2 114 54.3 45.0 121
Webber Springs 9260 30.5 21.7 141 35.3 29.0 122
Whiskey Park 9020 39.4 27.6 143 38.8 31.9 122
Willow Creek Pass 9523 20.1 15.6 129 19.6 15.8 124
Zirkel 9338 29.8 23.7 126 37.8 34.6 109
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Basin Index (%) 132 113
SWEETWATER
Deer Park 9700 26.1 15.4 169 28.6 21.6 132
Larsen Creek 9000 11.0 3.2 344 16.9 15.8 107
South Pass 9040 20.7 14.9 139 23.0 18.2 126
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Basin Index (%) 173 123
LOWER N. PLATTE
Casper Mtn. 7920 12.1 13.0 93 15.7 17.4 90
Laprele Creek 8390 11.0 6.4 172 15.4 14.6 105
Reno Hill 8430 16.8 13.3 126 19.3 18.2 106
Windy Peak 7915 10.7 4.3 249 14.1 12.4 114
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Basin Index (%) 137 103
LARAMIE RIVER
Brooklyn Lake 10250 25.9 23.4 111 28.7 24.9 115
Cinnabar Park 9707 -M 19.1 * 25.6 26.9 95
Crow Creek 8335 .5 .5 100* 10.9 12.4 88
Deadman Hill 10239 22.2 20.0 111 21.5 21.2 101
Rawah 9069 12.2 7.0 174 19.4 19.0 102
Roach 9740 18.0 15.4 117 23.5 21.6 109
Windy Peak 7915 10.7 4.3 249 14.1 12.4 114
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Basin Index (%) 127 104
S. PLATTE
Crow Creek 8335 .5 .5 100* 10.9 12.4 88
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Basin Index (%) 100* 88
LITTLE SNAKE RIVER
Battle Mountain 7498 10.3 .7 1471* 24.2 17.4 139
Divide Peak 8730 30.0 17.3 173 31.8 24.8 128
Elk River 8739 22.4 13.2 170 30.3 22.5 135
Elkhead Divide 8800 29.9 -M * 33.7 -M *
Little Snake River 8928 38.2 24.4 157 45.8 36.4 126
Old Battle 9860 44.9 35.4 127 45.5 38.3 119
Sage Creek Basin 7850 21.7 2.1 1033 22.0 14.5 152
Sandstone RS 8152 18.7 6.4 292 27.0 19.9 136
Whiskey Park 9020 39.4 27.6 143 38.8 31.9 122
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Basin Index (%) 177 129
UPPER GREEN RIVER
Big Sandy Opening 9080 15.8 12.0 132 17.3 14.9 116
Blind Bull Sum 8650 27.9 24.4 114 20.0 19.2 104
East Rim Divide 7930 8.6 6.7 128 13.0 12.4 105
Elkhart Park G.S. 9400 12.5 11.5 109 13.2 13.8 96
Gros Ventre Summit 8750 12.4 12.2 102 12.0 14.3 84
Gunsight Pass 9820 14.5 12.9 112 14.9 16.0 93
Indian Creek 9425 29.8 22.5 132 26.5 21.1 126
Kendall R.S. 7740 10.0 4.8 208 14.2 14.4 99
Larsen Creek 9000 11.0 3.2 344 16.9 15.8 107
Loomis Park 8240 14.4 11.8 122 18.0 18.3 98
New Fork Lake 8340 9.1 6.2 147 -M 11.8 *
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 12.5 7.4 169 17.3 15.1 115
Spring Creek Divide 9000 -M 25.2 * -M 25.2 *
Triple Peak 8500 26.0 19.6 133 28.5 27.9 102
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Basin Index (%) 132 104
LOWER GREEN RIVER
Blacks Fork Jct 8869 12.2 4.0 305 16.2 14.2 114
Buck Pasture 9632 21.5 -M * 23.8 -M *
EF Blacks Fork GS 9360 11.7 7.9 148 13.5 13.4 101
Hams Fork 7840 12.1 3.5 346 16.2 12.0 135
Henrys Fork 10182 -M -M * 17.0 -M *
Hewinta 9500 10.1 6.4 158 18.0 15.8 114
Hickerson Park 9122 8.8 4.2 210 14.0 12.0 117
Hole-in-Rock 9168 9.1 3.0 303 13.4 11.6 116
Indian Creek 9425 29.8 22.5 132 26.5 21.1 126
Kelley R.S. 8180 21.3 11.4 187 23.8 17.8 134
Spirit Lk 10235 23.6 11.9 198 23.5 19.4 121
Steel Creek Park 10158 22.3 17.0 131 22.3 18.5 121
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Basin Index (%) 175 120
UPPER BEAR RIVER
Bear River RS 8777 9.6 .8 1200* 17.4 13.8 126
Bug Lake 7987 30.3 14.6 208 26.9 19.4 139
Burts Miller Ranch 8000 5.2 .0 * 15.5 8.7 178
Chalk Creek #1 9171 36.3 21.2 171 34.2 25.6 134
Giveout 6930 13.0 .0 * 17.0 13.6 125
Hayden Fork 9130 22.1 9.5 233 30.0 23.1 130
Kelley R.S. 8180 21.3 11.4 187 23.8 17.8 134
Lily Lake 9133 12.4 10.2 122 18.8 18.0 104
Monte Cristo 8932 47.0 24.9 189 41.6 28.0 149
Salt River Summit 7640 19.7 9.0 219 22.0 17.8 124
Spring Creek Divide 9000 -M 25.2 * -M 25.2 *
Trial Lake 9992 39.8 23.2 172 36.6 24.5 149
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Basin Index (%) 206 135
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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.
