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 15 , 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 6.1 2.4 254 22.9 24.2 95
Blind Bull Sum 8650 25.5 23.7 108 20.6 20.6 100
Cottonwood Creek 7670 16.8 10.8 156 32.8 30.0 109
East Rim Divide 7930 .0 .0 * 13.5 13.7 99
Grand Targhee 9260 45.4 45.2 100 33.6 37.3 90
Granite Creek 6770 5.5 2.8 196 16.7 21.8 77
Grassy Lake 7265 26.6 19.7 135 43.3 40.2 108
Gros Ventre Summit 8750 6.0 8.7 69 11.8 15.2 78
Gunsight Pass 9820 9.5 11.8 81 15.5 17.4 89
Lewis Lake Divide 7850 29.9 25.2 119 43.5 39.1 111
Loomis Park 8240 7.7 5.8 133 18.3 20.2 91
Phillips Bench 8200 22.9 22.0 104 32.7 30.6 107
Salt River Summit 7640 8.2 .6 1367* 23.0 18.9 122
Snake River Station 6920 2.2 .0 * 25.1 26.3 95
Somsen Ranch 6800 3.5 .0 * 24.0 19.4 124
Spring Creek Divide 9000 27.5 22.8 121 24.4 27.4 89
Thumb Divide 7980 9.3 5.2 179 21.4 22.2 96
Togwotee Pass 9580 20.6 24.0 86 24.4 28.8 85
Triple Peak 8500 16.5 14.8 111 28.8 30.0 96
Two Ocean Plateau 9240 30.5 32.3 94 31.1 31.0 100
Willow Creek 8080 25.3 20.6 123 41.6 40.0 104
Younts Peak 8350 2.4 10.4 23 15.5 18.0 86
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Basin Index (%) 113 99
MADISON HEADWATERS IN WYOMING
Black Bear 8170 45.8 38.2 120 47.3 42.2 112
Canyon 7870 8.0 -M * 19.8 -M *
Madison Plateau 7750 25.4 18.9 134 32.9 30.6 108
West Yellowstone 6700 .0 .0 * 20.7 16.4 126
Whiskey Creek 6800 15.9 8.4 189 28.6 24.2 118
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Basin Index (%) 133 114
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 20.1 24.0 84 21.0 24.8 85
Canyon 7870 8.0 -M * 19.8 -M *
Evening Star 9200 22.9 25.5 90 32.4 33.6 96
Fisher Creek 9100 33.5 36.4 92 39.3 40.6 97
Monument Peak 8850 16.4 20.0 82 27.4 27.0 101
Northeast Entrance 7350 .0 .0 * 14.4 15.6 92
Parker Peak 9400 21.6 22.0 98 27.6 23.6 117
Sylvan Lake 8420 12.1 15.6 78 26.8 27.7 97
Thumb Divide 7980 9.3 5.2 179 21.4 22.2 96
Two Ocean Plateau 9240 30.5 32.3 94 31.1 31.0 100
White Mill 8700 23.2 25.4 91 26.4 27.1 97
Wolverine 7650 .1 .0 * 15.0 14.8 101
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Basin Index (%) 92 98
WIND RIVER
Burroughs Creek 8750 .4 -M * 12.2 -M *
Castle Creek 8400 .0 .0 * 8.5 11.0 77
Cold Springs 9630 .3 .6 50* 13.1 13.4 98
Deer Park 9700 21.5 13.2 163 30.0 23.4 128
Hobbs Park 10100 17.9 16.5 108 22.0 18.6 118
Kirwin 9550 7.0 11.0 64 16.4 16.0 102
Little Warm 9370 3.4 6.4 53 15.3 15.0 102
South Pass 9040 15.5 11.6 134 24.3 19.6 124
St. Lawrence Alt 8620 .1 -M * 14.7 -M *
Togwotee Pass 9580 20.6 24.0 86 24.4 28.8 85
Townsend Creek 8700 7.8 2.5 312 19.2 15.6 123
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Basin Index (%) 110 107
BIGHORN BASIN
Bald Mtn. 9380 17.1 20.4 84 18.5 20.3 91
Bear Trap Meadow 8200 .2 .0 * 13.1 12.5 105
Bone Springs Div 9350 13.4 16.4 82 15.6 19.2 81
Grave Springs 8550 1.4 5.2 27 15.2 13.1 116
Kirwin 9550 7.0 11.0 64 16.4 16.0 102
Marquette 8760 4.4 6.5 68 14.0 14.8 95
Middle Powder 7760 3.0 7.2 42 14.1 13.4 105
Owl Creek 8975 .0 .0 * 11.2 9.5 118
Powder River Pass 9480 1.8 8.4 21 16.7 17.0 98
Shell Creek 9580 12.9 16.0 81 17.1 17.4 98
Timber Creek 7950 .2 .0 * 11.0 12.0 92
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Basin Index (%) 67 99
SHOSHONE RIVER
Blackwater 9780 22.1 22.8 97 26.1 27.4 95
Evening Star 9200 22.9 25.5 90 32.4 33.6 96
Marquette 8760 4.4 6.5 68 14.0 14.8 95
Sylvan Lake 8420 12.1 15.6 78 26.8 27.7 97
Sylvan Road 7120 .0 .0 * 16.4 19.2 85
Younts Peak 8350 2.4 10.4 23 15.5 18.0 86
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Basin Index (%) 79 93
POWDER RIVER
Bear Trap Meadow 8200 .2 .0 * 13.1 12.5 105
Cloud Peak Reservoir 9860 14.3 15.0 95 19.8 19.3 103
Grave Springs 8550 1.4 5.2 27 15.2 13.1 116
Hansen Sawmill 8360 .1 .0 * 12.8 12.8 100
Middle Powder 7760 3.0 7.2 42 14.1 13.4 105
Powder River Pass 9480 1.8 8.4 21 16.7 17.0 98
Soldier Park 8720 .4 .0 * 12.3 12.1 102
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Basin Index (%) 59 104
TONGUE RIVER
Big Goose 7990 4.0 6.7 60 14.2 15.8 90
Bone Springs Div 9350 13.4 16.4 82 15.6 19.2 81
Burgess Junction 7880 8.2 9.4 87 17.2 16.4 105
Dome Lake 8880 5.8 9.2 63 15.0 18.8 80
Little Goose 8870 4.6 8.8 52 16.0 17.0 94
Sucker Creek 8880 7.6 10.0 76 20.2 19.4 104
Tie Creek 6870 .1 .0 * 16.3 16.0 102
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Basin Index (%) 72 93
BELLE FOURCHE
Blind Park 6890 .1 .0 * 14.3 14.5 99
Cole Canyon 5910 .0 .0 * 14.1 13.8 102
North Rapid Creek 6130 .0 .0 * 12.8 12.5 102
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Basin Index (%) * 101
CHEYENNE RIVER BASIN
Blind Park 6890 .1 .0 * 14.3 14.5 99
North Rapid Creek 6130 .0 .0 * 12.8 12.5 102
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Basin Index (%) * 100
UPPER N. PLATTE
Arapaho Ridge 10976 24.0 21.0 114 29.4 27.6 107
Blackhall Mtn 9839 31.3 29.7 105 42.7 38.9 110
Cinnabar Park 9707 -M 15.2 * 26.7 27.9 96
Columbine 9167 9.9 7.6 130 31.1 30.8 101
Divide Peak 8730 15.9 10.0 159 32.9 25.6 129
Joe Wright 10158 22.6 21.0 108 32.6 32.6 100
Laprele Creek 8390 .2 .0 * 16.7 16.2 103
Med Bow 10512 40.9 -M * 40.4 -M *
Never Summer 10323 25.7 21.5 120 23.2 21.8 106
North French Creek 10153 25.4 30.9 82 34.3 35.2 97
Old Battle 9860 40.4 35.6 113 46.6 41.4 113
Rawah 9069 2.1 .8 262* 20.8 20.2 103
Sage Creek Basin 7850 1.6 .0 * 22.7 16.1 141
Sand Lake 10098 29.4 31.0 95 34.2 31.6 108
South Brush Creek 8495 .3 .2 150* 17.4 18.6 94
Tower 10620 56.2 47.0 120 56.7 48.3 117
Webber Springs 9260 22.5 14.2 158 36.0 32.0 112
Whiskey Park 9020 29.9 24.4 123 39.2 35.2 111
Willow Creek Pass 9523 15.0 12.7 118 21.1 17.1 123
Zirkel 9338 14.3 14.3 100 38.2 35.6 107
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Basin Index (%) 114 109
SWEETWATER
Deer Park 9700 21.5 13.2 163 30.0 23.4 128
Larsen Creek 9000 .7 .0 * 17.5 16.5 106
South Pass 9040 15.5 11.6 134 24.3 19.6 124
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Basin Index (%) 152 121
LOWER N. PLATTE
Casper Mtn. 7920 1.3 5.8 22 21.1 18.6 113
Laprele Creek 8390 .2 .0 * 16.7 16.2 103
Reno Hill 8430 9.2 8.1 114 22.4 21.2 106
Windy Peak 7915 .3 .0 * 15.2 14.3 106
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Basin Index (%) 79 107
LARAMIE RIVER
Brooklyn Lake 10250 16.3 19.5 84 30.3 27.2 111
Cinnabar Park 9707 -M 15.2 * 26.7 27.9 96
Crow Creek 8335 .2 .0 * 12.6 14.0 90
Deadman Hill 10239 18.4 17.4 106 24.5 23.5 104
Rawah 9069 2.1 .8 262* 20.8 20.2 103
Roach 9740 12.2 12.7 96 25.6 23.4 109
Windy Peak 7915 .3 .0 * 15.2 14.3 106
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Basin Index (%) 98* 103
S. PLATTE
Crow Creek 8335 .2 .0 * 12.6 14.0 90
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Basin Index (%) * 90
LITTLE SNAKE RIVER
Battle Mountain 7498 .0 .0 * 24.4 18.5 132
Divide Peak 8730 15.9 10.0 159 32.9 25.6 129
Elk River 8739 6.7 1.6 419* 30.2 23.5 129
Elkhead Divide 8800 14.4 -M * 34.2 -M *
Little Snake River 8928 25.1 16.8 149 46.7 39.2 119
Old Battle 9860 40.4 35.6 113 46.6 41.4 113
Sage Creek Basin 7850 1.6 .0 * 22.7 16.1 141
Sandstone RS 8152 4.7 .0 * 27.4 21.2 129
Whiskey Park 9020 29.9 24.4 123 39.2 35.2 111
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Basin Index (%) 141 122
UPPER GREEN RIVER
Big Sandy Opening 9080 9.6 8.5 113 18.6 16.0 116
Blind Bull Sum 8650 25.5 23.7 108 20.6 20.6 100
East Rim Divide 7930 .0 .0 * 13.5 13.7 99
Elkhart Park G.S. 9400 6.7 9.0 74 14.2 15.7 90
Gros Ventre Summit 8750 6.0 8.7 69 11.8 15.2 78
Gunsight Pass 9820 9.5 11.8 81 15.5 17.4 89
Indian Creek 9425 23.3 21.4 109 27.5 23.6 117
Kendall R.S. 7740 .1 .0 * 14.6 15.8 92
Larsen Creek 9000 .7 .0 * 17.5 16.5 106
Loomis Park 8240 7.7 5.8 133 18.3 20.2 91
New Fork Lake 8340 .4 .6 67* -M 13.4 *
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 2.9 1.0 290* 18.6 16.1 116
Spring Creek Divide 9000 27.5 22.8 121 24.4 27.4 89
Triple Peak 8500 16.5 14.8 111 28.8 30.0 96
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Basin Index (%) 106 98
LOWER GREEN RIVER
Blacks Fork Jct 8869 2.0 .0 * 16.7 15.1 111
Buck Pasture 9632 12.1 -M * 24.5 -M *
EF Blacks Fork GS 9360 2.4 .5 480* 14.4 14.6 99
Hams Fork 7840 .5 .0 * 17.6 14.0 126
Henrys Fork 10182 -M -M * 17.4 -M *
Hewinta 9500 2.1 .0 * 18.8 17.1 110
Hickerson Park 9122 .1 .0 * 14.2 13.0 109
Hole-in-Rock 9168 .2 .0 * 13.8 13.2 105
Indian Creek 9425 23.3 21.4 109 27.5 23.6 117
Kelley R.S. 8180 11.5 5.1 225 25.0 19.6 128
Spirit Lk 10235 16.0 6.7 239 24.3 20.0 122
Steel Creek Park 10158 17.4 15.8 110 23.2 20.8 112
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Basin Index (%) 153* 114
UPPER BEAR RIVER
Bear River RS 8777 .0 .0 * 17.9 14.4 124
Bug Lake 7987 20.0 10.6 189 28.3 20.2 140
Burts Miller Ranch 8000 .2 .0 * 15.9 8.8 181
Chalk Creek #1 9171 26.2 17.6 149 35.1 27.8 126
Giveout 6930 1.2 .0 * 18.0 15.0 120
Hayden Fork 9130 8.7 1.0 870* 30.8 24.4 126
Kelley R.S. 8180 11.5 5.1 225 25.0 19.6 128
Lily Lake 9133 4.2 1.3 323 19.6 20.0 98
Monte Cristo 8932 36.9 19.0 194 43.4 29.6 147
Salt River Summit 7640 8.2 .6 1367* 23.0 18.9 122
Spring Creek Divide 9000 27.5 22.8 121 24.4 27.4 89
Trial Lake 9992 29.1 19.4 150 37.9 26.6 142
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Basin Index (%) 178 126
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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.
