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 THURSDAY: MAY 11 , 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 9.5 4.9 194 22.9 23.6 97
Blind Bull Sum 8650 25.4 24.2 105 20.5 20.2 101
Cottonwood Creek 7670 18.9 14.6 129 32.2 29.6 109
East Rim Divide 7930 .0 .6 0* 13.4 13.3 101
Grand Targhee 9260 45.8 47.0 97 33.6 37.2 90
Granite Creek 6770 8.7 5.0 174 16.6 21.4 78
Grassy Lake 7265 29.2 21.8 134 43.3 39.8 109
Gros Ventre Summit 8750 8.6 9.5 91 11.9 15.0 79
Gunsight Pass 9820 11.7 12.4 94 15.4 17.2 90
Lewis Lake Divide 7850 32.9 29.8 110 43.4 38.8 112
Loomis Park 8240 10.2 7.0 146 18.3 19.8 92
Phillips Bench 8200 25.4 23.5 108 32.5 30.1 108
Salt River Summit 7640 11.8 4.0 295 22.7 18.8 121
Snake River Station 6920 6.9 2.4 288 25.0 26.0 96
Somsen Ranch 6800 8.7 .0 * 23.8 19.2 124
Spring Creek Divide 9000 29.2 24.0 122 -M 27.0 *
Thumb Divide 7980 12.8 7.4 173 21.4 22.2 96
Togwotee Pass 9580 22.3 25.8 86 24.2 28.6 85
Triple Peak 8500 18.9 16.3 116 28.7 29.6 97
Two Ocean Plateau 9240 32.9 33.3 99 31.0 30.5 102
Willow Creek 8080 30.0 22.7 132 41.2 39.3 105
Younts Peak 8350 6.5 12.5 52 15.4 17.8 87
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Basin Index (%) 117 100
MADISON HEADWATERS IN WYOMING
Black Bear 8170 46.1 40.8 113 47.3 41.6 114
Canyon 7870 10.6 -M * 19.8 -M *
Madison Plateau 7750 28.0 21.6 130 32.9 30.0 110
West Yellowstone 6700 1.4 .0 * 20.9 16.2 129
Whiskey Creek 6800 18.4 10.0 184 28.6 23.4 122
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Basin Index (%) 130 117
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 20.6 25.0 82 20.8 24.6 85
Canyon 7870 10.6 -M * 19.8 -M *
Evening Star 9200 23.6 26.4 89 31.9 33.2 96
Fisher Creek 9100 35.3 36.2 98 39.2 39.2 100
Monument Peak 8850 18.6 21.4 87 27.0 26.6 102
Northeast Entrance 7350 .0 .0 * 14.3 15.1 95
Parker Peak 9400 24.1 23.5 103 27.4 23.4 117
Sylvan Lake 8420 15.1 17.4 87 26.8 27.4 98
Thumb Divide 7980 12.8 7.4 173 21.4 22.2 96
Two Ocean Plateau 9240 32.9 33.3 99 31.0 30.5 102
White Mill 8700 24.9 26.6 94 26.3 26.4 100
Wolverine 7650 1.1 .0 * 14.8 14.6 101
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Basin Index (%) 96 99
WIND RIVER
Burroughs Creek 8750 .8 -M * 11.9 -M *
Castle Creek 8400 .1 .0 * 8.3 10.8 77
Cold Springs 9630 .2 2.2 9 12.2 12.6 97
Deer Park 9700 22.1 14.0 158 29.1 23.0 127
Hobbs Park 10100 16.5 15.6 106 20.2 17.8 113
Kirwin 9550 7.0 11.6 60 15.2 15.8 96
Little Warm 9370 5.3 7.2 74 15.1 14.4 105
South Pass 9040 17.2 12.7 135 23.8 19.3 123
St. Lawrence Alt 8620 .1 -M * 13.2 -M *
Togwotee Pass 9580 22.3 25.8 86 24.2 28.6 85
Townsend Creek 8700 8.8 5.0 176 17.2 15.5 111
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Basin Index (%) 106 105
BIGHORN BASIN
Bald Mtn. 9380 18.0 21.1 85 18.1 19.8 91
Bear Trap Meadow 8200 .1 .4 25* 12.0 12.2 98
Bone Springs Div 9350 13.8 17.6 78 14.9 18.8 79
Grave Springs 8550 3.3 6.4 52 -M 12.7 *
Kirwin 9550 7.0 11.6 60 15.2 15.8 96
Marquette 8760 5.2 8.4 62 13.0 13.3 98
Middle Powder 7760 6.6 9.3 71 13.0 13.3 98
Owl Creek 8975 .0 .8 0 10.5 9.2 114
Powder River Pass 9480 3.1 8.9 35 16.1 16.8 96
Shell Creek 9580 13.8 16.6 83 16.8 17.2 98
Timber Creek 7950 .2 1.3 15 9.6 11.4 84
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Basin Index (%) 69 94
SHOSHONE RIVER
Blackwater 9780 21.6 24.8 87 25.4 26.8 95
Evening Star 9200 23.6 26.4 89 31.9 33.2 96
Marquette 8760 5.2 8.4 62 13.0 13.3 98
Sylvan Lake 8420 15.1 17.4 87 26.8 27.4 98
Sylvan Road 7120 .1 .0 * 16.6 19.0 87
Younts Peak 8350 6.5 12.5 52 15.4 17.8 87
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Basin Index (%) 81 94
POWDER RIVER
Bear Trap Meadow 8200 .1 .4 25* 12.0 12.2 98
Cloud Peak Reservoir 9860 13.2 16.0 82 17.6 18.4 96
Grave Springs 8550 3.3 6.4 52 -M 12.7 *
Hansen Sawmill 8360 .1 1.2 8 11.3 12.2 93
Middle Powder 7760 6.6 9.3 71 13.0 13.3 98
Powder River Pass 9480 3.1 8.9 35 16.1 16.8 96
Soldier Park 8720 2.0 .8 250 10.9 12.0 91
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Basin Index (%) 66 95
TONGUE RIVER
Big Goose 7990 5.5 8.5 65 12.7 15.0 85
Bone Springs Div 9350 13.8 17.6 78 14.9 18.8 79
Burgess Junction 7880 9.9 10.8 92 16.2 16.0 101
Dome Lake 8880 6.5 11.0 59 14.4 17.6 82
Little Goose 8870 5.3 9.4 56 14.4 16.6 87
Sucker Creek 8880 8.1 12.5 65 19.1 19.1 100
Tie Creek 6870 .1 .4 25* 14.9 15.6 96
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Basin Index (%) 70 90
BELLE FOURCHE
Blind Park 6890 .0 .0 * 12.9 14.2 91
Cole Canyon 5910 .0 .0 * 12.4 13.4 93
North Rapid Creek 6130 .2 .0 * 10.4 12.2 85
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Basin Index (%) * 90
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 12.9 14.2 91
North Rapid Creek 6130 .2 .0 * 10.4 12.2 85
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Basin Index (%) * 88
UPPER N. PLATTE
Arapaho Ridge 10976 23.8 22.2 107 28.5 26.8 106
Blackhall Mtn 9839 32.1 33.2 97 41.7 37.5 111
Cinnabar Park 9707 -M 17.6 * 25.9 27.8 93
Columbine 9167 13.0 12.0 108 30.2 30.4 99
Divide Peak 8730 19.7 11.2 176 32.3 25.4 127
Joe Wright 10158 23.3 22.4 104 31.6 32.1 98
Laprele Creek 8390 2.6 .7 371* 15.6 15.8 99
Med Bow 10512 40.3 -M * 39.2 -M *
Never Summer 10323 25.0 22.0 114 21.6 21.0 103
North French Creek 10153 26.7 32.5 82 33.8 35.0 97
Old Battle 9860 39.9 37.2 107 46.1 41.0 112
Rawah 9069 5.8 2.8 207 19.8 20.2 98
Sage Creek Basin 7850 8.1 .0 * 22.2 15.7 141
Sand Lake 10098 29.5 32.1 92 32.3 31.5 103
South Brush Creek 8495 1.2 1.4 86 17.1 17.8 96
Tower 10620 55.8 48.0 116 56.0 47.6 118
Webber Springs 9260 24.0 18.0 133 35.4 31.4 113
Whiskey Park 9020 33.8 26.6 127 39.0 35.2 111
Willow Creek Pass 9523 16.2 14.0 116 20.1 16.8 120
Zirkel 9338 18.3 19.1 96 38.1 35.4 108
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Basin Index (%) 112 108
SWEETWATER
Deer Park 9700 22.1 14.0 158 29.1 23.0 127
Larsen Creek 9000 4.7 .0 * 17.5 16.5 106
South Pass 9040 17.2 12.7 135 23.8 19.3 123
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Basin Index (%) 165 120
LOWER N. PLATTE
Casper Mtn. 7920 4.0 9.8 41 16.1 18.2 88
Laprele Creek 8390 2.6 .7 371* 15.6 15.8 99
Reno Hill 8430 10.5 10.4 101 19.6 21.2 92
Windy Peak 7915 2.9 .3 967* 14.2 14.2 100
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Basin Index (%) 94 94
LARAMIE RIVER
Brooklyn Lake 10250 17.8 21.0 85 29.1 27.1 107
Cinnabar Park 9707 -M 17.6 * 25.9 27.8 93
Crow Creek 8335 .1 .0 * 11.2 13.7 82
Deadman Hill 10239 17.1 18.5 92 21.8 23.2 94
Rawah 9069 5.8 2.8 207 19.8 20.2 98
Roach 9740 11.8 15.2 78 23.9 22.6 106
Windy Peak 7915 2.9 .3 967* 14.2 14.2 100
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Basin Index (%) 96 98
S. PLATTE
Crow Creek 8335 .1 .0 * 11.2 13.7 82
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Basin Index (%) * 82
LITTLE SNAKE RIVER
Battle Mountain 7498 .3 .0 * 24.4 18.2 134
Divide Peak 8730 19.7 11.2 176 32.3 25.4 127
Elk River 8739 11.1 5.8 191 30.2 23.5 129
Elkhead Divide 8800 18.0 -M * 34.0 -M *
Little Snake River 8928 28.6 21.2 135 46.1 38.4 120
Old Battle 9860 39.9 37.2 107 46.1 41.0 112
Sage Creek Basin 7850 8.1 .0 * 22.2 15.7 141
Sandstone RS 8152 8.7 .6 1450* 27.2 20.6 132
Whiskey Park 9020 33.8 26.6 127 39.0 35.2 111
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Basin Index (%) 146 123
UPPER GREEN RIVER
Big Sandy Opening 9080 12.7 9.3 137 18.5 15.8 117
Blind Bull Sum 8650 25.4 24.2 105 20.5 20.2 101
East Rim Divide 7930 .0 .6 0* 13.4 13.3 101
Elkhart Park G.S. 9400 9.5 9.6 99 14.0 15.1 93
Gros Ventre Summit 8750 8.6 9.5 91 11.9 15.0 79
Gunsight Pass 9820 11.7 12.4 94 15.4 17.2 90
Indian Creek 9425 25.9 21.0 123 27.2 23.2 117
Kendall R.S. 7740 2.9 .0 * 14.6 15.4 95
Larsen Creek 9000 4.7 .0 * 17.5 16.5 106
Loomis Park 8240 10.2 7.0 146 18.3 19.8 92
New Fork Lake 8340 3.7 2.8 132 -M 12.9 *
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 6.2 4.2 148 17.9 15.8 113
Spring Creek Divide 9000 29.2 24.0 122 -M 27.0 *
Triple Peak 8500 18.9 16.3 116 28.7 29.6 97
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Basin Index (%) 120 100
LOWER GREEN RIVER
Blacks Fork Jct 8869 6.0 .0 * 16.6 15.0 111
Buck Pasture 9632 14.8 -M * 24.4 -M *
EF Blacks Fork GS 9360 5.6 3.8 147 14.1 14.4 98
Hams Fork 7840 4.8 .0 * 17.3 13.6 127
Henrys Fork 10182 -M -M * 17.5 -M *
Hewinta 9500 5.3 .5 1060* 18.6 16.6 112
Hickerson Park 9122 .7 .1 700* 14.2 13.0 109
Hole-in-Rock 9168 .7 .0 * 13.7 12.8 107
Indian Creek 9425 25.9 21.0 123 27.2 23.2 117
Kelley R.S. 8180 14.8 8.3 178 24.8 19.2 129
Spirit Lk 10235 17.9 10.0 179 24.0 20.0 120
Steel Creek Park 10158 18.6 18.1 103 22.9 20.1 114
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Basin Index (%) 162 115
UPPER BEAR RIVER
Bear River RS 8777 1.0 .0 * 17.9 14.3 125
Bug Lake 7987 23.9 12.2 196 27.8 20.0 139
Burts Miller Ranch 8000 .0 .0 * 15.8 8.8 180
Chalk Creek #1 9171 29.6 19.5 152 34.8 27.3 127
Giveout 6930 5.5 .0 * 17.7 15.0 118
Hayden Fork 9130 12.3 4.4 280 30.7 24.3 126
Kelley R.S. 8180 14.8 8.3 178 24.8 19.2 129
Lily Lake 9133 7.4 5.6 132 19.4 19.8 98
Monte Cristo 8932 40.6 20.9 194 42.3 29.2 145
Salt River Summit 7640 11.8 4.0 295 22.7 18.8 121
Spring Creek Divide 9000 29.2 24.0 122 -M 27.0 *
Trial Lake 9992 32.2 20.8 155 37.6 26.5 142
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Basin Index (%) 174 131
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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.
