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 WEDNESDAY: MAY 10 , 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 10.0 5.6 179 22.8 23.6 97
Blind Bull Sum 8650 25.7 24.2 106 20.5 20.0 102
Cottonwood Creek 7670 19.5 15.1 129 32.2 29.4 110
East Rim Divide 7930 .2 1.4 14 13.2 13.2 100
Grand Targhee 9260 45.7 46.6 98 33.6 36.8 91
Granite Creek 6770 9.2 5.4 170 16.6 21.3 78
Grassy Lake 7265 29.6 22.6 131 43.2 39.4 110
Gros Ventre Summit 8750 9.0 9.8 92 11.9 14.9 80
Gunsight Pass 9820 11.8 12.4 95 15.3 17.1 89
Lewis Lake Divide 7850 33.9 29.8 114 43.4 38.4 113
Loomis Park 8240 10.6 7.7 138 18.2 19.5 93
Phillips Bench 8200 25.9 23.6 110 32.5 29.4 111
Salt River Summit 7640 12.7 4.5 282 22.7 18.8 121
Snake River Station 6920 8.0 3.3 242 25.0 26.0 96
Somsen Ranch 6800 9.5 .0 * 23.9 19.1 125
Spring Creek Divide 9000 -M 24.0 * -M 26.8 *
Thumb Divide 7980 13.2 8.0 165 21.3 22.2 96
Togwotee Pass 9580 22.5 25.8 87 24.2 28.6 85
Triple Peak 8500 19.6 16.8 117 28.7 29.6 97
Two Ocean Plateau 9240 33.2 33.1 100 30.8 30.5 101
Willow Creek 8080 31.1 23.6 132 41.2 39.1 105
Younts Peak 8350 7.2 12.6 57 15.0 17.8 84
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Basin Index (%) 117 100
MADISON HEADWATERS IN WYOMING
Black Bear 8170 46.0 41.0 112 47.2 41.6 113
Canyon 7870 11.1 -M * 19.7 -M *
Madison Plateau 7750 28.3 22.2 127 32.9 29.6 111
West Yellowstone 6700 2.3 .0 * 21.0 16.2 130
Whiskey Creek 6800 18.8 10.4 181 28.5 23.0 124
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Basin Index (%) 130 117
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 20.8 24.8 84 20.7 24.4 85
Canyon 7870 11.1 -M * 19.7 -M *
Evening Star 9200 24.0 27.0 89 31.8 33.1 96
Fisher Creek 9100 35.7 36.2 99 39.0 38.7 101
Monument Peak 8850 19.1 21.6 88 27.0 26.4 102
Northeast Entrance 7350 .0 .0 * 14.3 15.1 95
Parker Peak 9400 24.9 23.8 105 27.3 23.4 117
Sylvan Lake 8420 15.6 18.0 87 26.7 27.4 97
Thumb Divide 7980 13.2 8.0 165 21.3 22.2 96
Two Ocean Plateau 9240 33.2 33.1 100 30.8 30.5 101
White Mill 8700 25.1 26.5 95 26.3 26.4 100
Wolverine 7650 1.7 .0 * 14.7 14.4 102
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Basin Index (%) 97 99
WIND RIVER
Burroughs Creek 8750 .8 -M * 11.9 -M *
Castle Creek 8400 .0 .0 * 8.2 10.8 76
Cold Springs 9630 .2 1.6 12 12.2 12.6 97
Deer Park 9700 22.4 13.8 162 29.0 23.0 126
Hobbs Park 10100 16.6 15.8 105 20.1 17.6 114
Kirwin 9550 7.3 11.3 65 15.1 15.6 97
Little Warm 9370 5.8 7.5 77 15.0 14.4 104
South Pass 9040 17.4 12.7 137 23.7 19.2 123
St. Lawrence Alt 8620 .0 -M * 13.2 -M *
Togwotee Pass 9580 22.5 25.8 87 24.2 28.6 85
Townsend Creek 8700 9.0 5.7 158 17.0 15.2 112
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Basin Index (%) 107 105
BIGHORN BASIN
Bald Mtn. 9380 18.0 21.0 86 17.7 19.7 90
Bear Trap Meadow 8200 .1 .1 100* 11.5 12.0 96
Bone Springs Div 9350 14.1 17.0 83 14.8 18.8 79
Grave Springs 8550 2.5 6.3 40 12.8 12.6 102
Kirwin 9550 7.3 11.3 65 15.1 15.6 97
Marquette 8760 5.6 8.4 67 12.9 13.2 98
Middle Powder 7760 6.9 9.4 73 12.0 13.3 90
Owl Creek 8975 .0 .8 0 10.4 9.0 116
Powder River Pass 9480 3.7 8.8 42 15.8 16.5 96
Shell Creek 9580 13.8 16.8 82 16.6 17.2 97
Timber Creek 7950 .2 1.4 14 9.5 11.4 83
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Basin Index (%) 71 94
SHOSHONE RIVER
Blackwater 9780 21.1 25.2 84 25.2 26.7 94
Evening Star 9200 24.0 27.0 89 31.8 33.1 96
Marquette 8760 5.6 8.4 67 12.9 13.2 98
Sylvan Lake 8420 15.6 18.0 87 26.7 27.4 97
Sylvan Road 7120 .1 .0 * 16.5 19.0 87
Younts Peak 8350 7.2 12.6 57 15.0 17.8 84
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Basin Index (%) 81 93
POWDER RIVER
Bear Trap Meadow 8200 .1 .1 100* 11.5 12.0 96
Cloud Peak Reservoir 9860 13.2 16.0 82 17.2 18.4 93
Grave Springs 8550 2.5 6.3 40 12.8 12.6 102
Hansen Sawmill 8360 .2 1.6 12 10.8 12.2 89
Middle Powder 7760 6.9 9.4 73 12.0 13.3 90
Powder River Pass 9480 3.7 8.8 42 15.8 16.5 96
Soldier Park 8720 2.6 .8 325 10.6 12.0 88
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Basin Index (%) 68 94
TONGUE RIVER
Big Goose 7990 5.9 8.4 70 12.5 14.5 86
Bone Springs Div 9350 14.1 17.0 83 14.8 18.8 79
Burgess Junction 7880 10.4 10.9 95 16.0 15.7 102
Dome Lake 8880 7.0 11.0 64 14.1 17.6 80
Little Goose 8870 5.8 9.4 62 14.1 16.4 86
Sucker Creek 8880 8.7 12.4 70 19.0 18.8 101
Tie Creek 6870 .1 .6 17 14.9 15.0 99
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Basin Index (%) 75 90
BELLE FOURCHE
Blind Park 6890 .0 .0 * 12.9 14.1 91
Cole Canyon 5910 .0 .0 * 12.3 13.4 92
North Rapid Creek 6130 .6 .0 * 10.5 12.0 88
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Basin Index (%) * 90
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 12.9 14.1 91
North Rapid Creek 6130 .6 .0 * 10.5 12.0 88
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Basin Index (%) * 90
UPPER N. PLATTE
Arapaho Ridge 10976 24.7 22.0 112 28.4 26.7 106
Blackhall Mtn 9839 32.7 33.0 99 41.7 37.1 112
Cinnabar Park 9707 -M 18.0 * 25.9 27.8 93
Columbine 9167 14.0 12.9 109 30.1 30.2 100
Divide Peak 8730 21.1 12.4 170 32.3 25.4 127
Joe Wright 10158 24.1 22.6 107 31.6 32.0 99
Laprele Creek 8390 3.8 1.6 238 15.6 15.6 100
Med Bow 10512 40.8 -M * 38.9 -M *
Never Summer 10323 25.8 22.0 117 21.5 20.8 103
North French Creek 10153 27.5 32.2 85 33.5 34.8 96
Old Battle 9860 40.0 36.4 110 46.1 40.6 114
Rawah 9069 6.7 3.6 186 19.8 20.2 98
Sage Creek Basin 7850 9.8 .0 * 22.2 15.7 141
Sand Lake 10098 29.6 32.4 91 32.0 31.5 102
South Brush Creek 8495 2.2 1.6 138 17.0 17.7 96
Tower 10620 56.0 48.2 116 55.8 47.4 118
Webber Springs 9260 24.8 18.0 138 35.4 31.2 113
Whiskey Park 9020 33.5 26.7 125 39.0 34.8 112
Willow Creek Pass 9523 16.9 14.4 117 19.9 16.8 118
Zirkel 9338 19.5 19.6 99 38.0 35.4 107
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Basin Index (%) 115 108
SWEETWATER
Deer Park 9700 22.4 13.8 162 29.0 23.0 126
Larsen Creek 9000 5.3 .1 5300* 17.5 16.5 106
South Pass 9040 17.4 12.7 137 23.7 19.2 123
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Basin Index (%) 170 120
LOWER N. PLATTE
Casper Mtn. 7920 5.0 10.0 50 16.1 18.2 88
Laprele Creek 8390 3.8 1.6 238 15.6 15.6 100
Reno Hill 8430 11.4 11.4 100 19.6 21.2 92
Windy Peak 7915 4.2 .8 525 14.2 14.2 100
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Basin Index (%) 103 95
LARAMIE RIVER
Brooklyn Lake 10250 18.2 21.0 87 29.0 26.9 108
Cinnabar Park 9707 -M 18.0 * 25.9 27.8 93
Crow Creek 8335 .1 .0 * 11.3 13.7 82
Deadman Hill 10239 17.8 19.2 93 21.8 22.6 96
Rawah 9069 6.7 3.6 186 19.8 20.2 98
Roach 9740 12.8 15.3 84 23.8 22.6 105
Windy Peak 7915 4.2 .8 525 14.2 14.2 100
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Basin Index (%) 100 99
S. PLATTE
Crow Creek 8335 .1 .0 * 11.3 13.7 82
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Basin Index (%) * 82
LITTLE SNAKE RIVER
Battle Mountain 7498 .9 .0 * 24.4 18.1 135
Divide Peak 8730 21.1 12.4 170 32.3 25.4 127
Elk River 8739 12.4 7.1 175 30.2 23.3 130
Elkhead Divide 8800 19.0 -M * 34.0 -M *
Little Snake River 8928 29.6 21.3 139 46.0 38.0 121
Old Battle 9860 40.0 36.4 110 46.1 40.6 114
Sage Creek Basin 7850 9.8 .0 * 22.2 15.7 141
Sandstone RS 8152 10.0 1.6 625 27.2 20.4 133
Whiskey Park 9020 33.5 26.7 125 39.0 34.8 112
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Basin Index (%) 149 124
UPPER GREEN RIVER
Big Sandy Opening 9080 13.2 9.2 143 18.5 15.7 118
Blind Bull Sum 8650 25.7 24.2 106 20.5 20.0 102
East Rim Divide 7930 .2 1.4 14 13.2 13.2 100
Elkhart Park G.S. 9400 9.9 9.8 101 13.9 14.8 94
Gros Ventre Summit 8750 9.0 9.8 92 11.9 14.9 80
Gunsight Pass 9820 11.8 12.4 95 15.3 17.1 89
Indian Creek 9425 26.8 20.8 129 27.2 22.8 119
Kendall R.S. 7740 3.3 .0 * 14.6 15.2 96
Larsen Creek 9000 5.3 .1 5300* 17.5 16.5 106
Loomis Park 8240 10.6 7.7 138 18.2 19.5 93
New Fork Lake 8340 4.1 2.8 146 -M 12.8 *
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 7.1 4.6 154 17.9 15.8 113
Spring Creek Divide 9000 -M 24.0 * -M 26.8 *
Triple Peak 8500 19.6 16.8 117 28.7 29.6 97
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Basin Index (%) 123 101
LOWER GREEN RIVER
Blacks Fork Jct 8869 7.1 .0 * 16.6 14.9 111
Buck Pasture 9632 15.5 -M * 24.4 -M *
EF Blacks Fork GS 9360 6.2 4.4 141 14.1 14.4 98
Hams Fork 7840 5.6 .0 * 17.3 13.4 129
Henrys Fork 10182 -M -M * 17.6 -M *
Hewinta 9500 6.1 1.4 436 18.6 16.6 112
Hickerson Park 9122 1.5 .0 * 14.2 12.8 111
Hole-in-Rock 9168 1.6 .0 * 13.6 12.7 107
Indian Creek 9425 26.8 20.8 129 27.2 22.8 119
Kelley R.S. 8180 15.5 8.4 185 24.8 19.0 131
Spirit Lk 10235 18.5 10.6 175 23.9 20.0 120
Steel Creek Park 10158 19.1 17.6 109 22.9 19.9 115
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Basin Index (%) 171 116
UPPER BEAR RIVER
Bear River RS 8777 1.8 .0 * 17.9 14.2 126
Bug Lake 7987 25.0 11.9 210 27.8 20.0 139
Burts Miller Ranch 8000 .0 .0 * 15.8 8.8 180
Chalk Creek #1 9171 30.3 19.6 155 34.8 27.2 128
Giveout 6930 6.6 .0 * 17.7 14.8 120
Hayden Fork 9130 13.1 4.7 279 30.7 24.2 127
Kelley R.S. 8180 15.5 8.4 185 24.8 19.0 131
Lily Lake 9133 8.0 6.0 133 19.4 19.6 99
Monte Cristo 8932 41.8 21.0 199 42.4 28.8 147
Salt River Summit 7640 12.7 4.5 282 22.7 18.8 121
Spring Creek Divide 9000 -M 24.0 * -M 26.8 *
Trial Lake 9992 32.9 21.0 157 37.6 26.3 143
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Basin Index (%) 193 132
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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.
