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 3 , 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 14.1 9.5 148 22.6 22.8 99
Blind Bull Sum 8650 25.9 24.6 105 -M 19.4 *
Cottonwood Creek 7670 22.5 17.2 131 31.1 28.2 110
East Rim Divide 7930 5.5 5.9 93 13.0 12.6 103
Grand Targhee 9260 48.4 45.8 106 -M 36.0 *
Granite Creek 6770 12.4 9.6 129 16.2 21.0 77
Grassy Lake 7265 32.3 27.9 116 42.3 38.4 110
Gros Ventre Summit 8750 11.1 11.7 95 11.9 14.7 81
Gunsight Pass 9820 12.7 13.0 98 15.0 16.2 93
Lewis Lake Divide 7850 35.4 29.8 119 42.8 37.0 116
Loomis Park 8240 13.1 11.5 114 17.9 18.6 96
Phillips Bench 8200 28.4 27.1 105 32.2 28.8 112
Salt River Summit 7640 16.7 7.9 211 22.0 17.8 124
Snake River Station 6920 12.3 9.0 137 24.7 24.8 100
Somsen Ranch 6800 13.9 .2 6950* 23.3 18.2 128
Spring Creek Divide 9000 -M 25.2 * -M 25.4 *
Thumb Divide 7980 16.7 12.0 139 20.8 20.9 100
Togwotee Pass 9580 22.6 25.2 90 23.3 27.2 86
Triple Peak 8500 21.9 19.1 115 28.4 28.4 100
Two Ocean Plateau 9240 34.6 32.4 107 30.0 29.6 101
Willow Creek 8080 35.1 27.2 129 40.1 37.2 108
Younts Peak 8350 12.2 13.7 89 14.8 17.3 86
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Basin Index (%) 118 103
MADISON HEADWATERS IN WYOMING
Black Bear 8170 46.6 40.0 116 45.9 41.0 112
Canyon 7870 13.3 -M * 18.8 -M *
Madison Plateau 7750 31.8 23.0 138 32.0 27.8 115
West Yellowstone 6700 8.1 .0 * 20.4 15.8 129
Whiskey Creek 6800 20.6 13.0 158 27.8 22.6 123
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Basin Index (%) 141 118
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 21.0 23.9 88 20.4 23.1 88
Canyon 7870 13.3 -M * 18.8 -M *
Evening Star 9200 25.4 26.9 94 31.3 31.6 99
Fisher Creek 9100 36.8 35.6 103 38.2 37.0 103
Monument Peak 8850 21.9 21.8 100 26.7 25.5 105
Northeast Entrance 7350 3.5 2.4 146 13.9 14.6 95
Parker Peak 9400 28.0 24.2 116 26.8 22.7 118
Sylvan Lake 8420 18.0 19.3 93 26.1 26.4 99
Thumb Divide 7980 16.7 12.0 139 20.8 20.9 100
Two Ocean Plateau 9240 34.6 32.4 107 30.0 29.6 101
White Mill 8700 25.7 26.6 97 25.5 25.7 99
Wolverine 7650 8.4 4.4 191 14.4 13.9 104
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Basin Index (%) 105 101
WIND RIVER
Burroughs Creek 8750 5.4 -M * 11.7 -M *
Castle Creek 8400 .1 .2 50* 8.1 9.6 84
Cold Springs 9630 3.7 4.0 92 12.0 11.3 106
Deer Park 9700 25.4 15.1 168 28.6 21.8 131
Hobbs Park 10100 18.5 16.7 111 19.7 16.6 119
Kirwin 9550 9.9 11.4 87 14.7 14.4 102
Little Warm 9370 8.4 9.2 91 14.5 13.4 108
South Pass 9040 20.2 14.7 137 23.4 18.2 129
St. Lawrence Alt 8620 4.5 -M * 13.0 -M *
Togwotee Pass 9580 22.6 25.2 90 23.3 27.2 86
Townsend Creek 8700 12.8 9.0 142 16.9 13.7 123
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Basin Index (%) 115 110
BIGHORN BASIN
Bald Mtn. 9380 19.1 20.5 93 17.2 18.6 92
Bear Trap Meadow 8200 2.0 1.0 200 11.1 11.2 99
Bone Springs Div 9350 16.3 17.6 93 14.0 18.4 76
Grave Springs 8550 6.8 8.7 78 12.7 12.2 104
Kirwin 9550 9.9 11.4 87 14.7 14.4 102
Marquette 8760 8.6 7.8 110 12.4 12.2 102
Middle Powder 7760 10.3 11.1 93 11.6 12.5 93
Owl Creek 8975 .6 1.0 60 10.4 8.5 122
Powder River Pass 9480 6.7 9.6 70 15.5 15.2 102
Shell Creek 9580 14.1 16.1 88 16.0 16.2 99
Timber Creek 7950 2.4 2.8 86 9.3 10.4 89
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Basin Index (%) 90 97
SHOSHONE RIVER
Blackwater 9780 20.7 25.8 80 24.9 25.6 97
Evening Star 9200 25.4 26.9 94 31.3 31.6 99
Marquette 8760 8.6 7.8 110 12.4 12.2 102
Sylvan Lake 8420 18.0 19.3 93 26.1 26.4 99
Sylvan Road 7120 .1 3.8 3 16.1 18.2 88
Younts Peak 8350 12.2 13.7 89 14.8 17.3 86
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Basin Index (%) 87 96
POWDER RIVER
Bear Trap Meadow 8200 2.0 1.0 200 11.1 11.2 99
Cloud Peak Reservoir 9860 14.6 16.2 90 16.8 17.2 98
Grave Springs 8550 6.8 8.7 78 12.7 12.2 104
Hansen Sawmill 8360 4.8 3.8 126 10.6 11.0 96
Middle Powder 7760 10.3 11.1 93 11.6 12.5 93
Powder River Pass 9480 6.7 9.6 70 15.5 15.2 102
Soldier Park 8720 5.7 3.6 158 10.1 11.4 89
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Basin Index (%) 94 97
TONGUE RIVER
Big Goose 7990 8.5 8.6 99 12.0 13.3 90
Bone Springs Div 9350 16.3 17.6 93 14.0 18.4 76
Burgess Junction 7880 12.4 11.6 107 15.2 14.8 103
Dome Lake 8880 9.6 11.4 84 13.7 16.1 85
Little Goose 8870 8.4 10.5 80 13.7 16.0 86
Sucker Creek 8880 11.6 11.8 98 18.6 17.4 107
Tie Creek 6870 4.5 2.0 225 14.6 13.8 106
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Basin Index (%) 97 93
BELLE FOURCHE
Blind Park 6890 .0 .1 0* 12.8 13.6 94
Cole Canyon 5910 2.4 .4 600* 12.1 12.0 101
North Rapid Creek 6130 .7 .4 175* 10.5 10.8 97
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Basin Index (%) 344* 97
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .1 0* 12.8 13.6 94
North Rapid Creek 6130 .7 .4 175* 10.5 10.8 97
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Basin Index (%) 140* 95
UPPER N. PLATTE
Arapaho Ridge 10976 26.3 22.4 117 27.8 25.2 110
Blackhall Mtn 9839 36.0 31.6 114 41.2 35.8 115
Cinnabar Park 9707 -M 18.8 * 25.6 27.5 93
Columbine 9167 21.1 17.6 120 29.7 29.2 102
Divide Peak 8730 26.6 15.3 174 31.7 25.0 127
Joe Wright 10158 26.7 22.8 117 31.0 30.6 101
Laprele Creek 8390 8.7 6.0 145 15.4 14.9 103
Med Bow 10512 41.4 -M * 38.5 -M *
Never Summer 10323 27.7 22.4 124 21.1 20.0 106
North French Creek 10153 31.3 32.7 96 33.2 32.9 101
Old Battle 9860 41.3 35.2 117 45.5 38.8 117
Rawah 9069 10.2 6.4 159 19.4 19.4 100
Sage Creek Basin 7850 17.4 .3 5800* 22.0 14.7 150
Sand Lake 10098 30.6 32.0 96 31.7 29.3 108
South Brush Creek 8495 7.6 6.5 117 16.7 16.8 99
Tower 10620 53.5 47.2 113 55.0 45.2 122
Webber Springs 9260 27.4 21.2 129 35.3 29.6 119
Whiskey Park 9020 35.6 26.8 133 38.7 33.2 117
Willow Creek Pass 9523 18.7 15.2 123 19.6 16.6 118
Zirkel 9338 25.6 22.4 114 37.6 35.1 107
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Basin Index (%) 123 111
SWEETWATER
Deer Park 9700 25.4 15.1 168 28.6 21.8 131
Larsen Creek 9000 8.4 3.6 233 16.9 16.1 105
South Pass 9040 20.2 14.7 137 23.4 18.2 129
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Basin Index (%) 162 123
LOWER N. PLATTE
Casper Mtn. 7920 9.7 12.2 80 15.7 17.8 88
Laprele Creek 8390 8.7 6.0 145 15.4 14.9 103
Reno Hill 8430 15.4 13.8 112 19.3 18.8 103
Windy Peak 7915 8.8 3.7 238 14.1 13.2 107
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Basin Index (%) 119 100
LARAMIE RIVER
Brooklyn Lake 10250 22.9 23.2 99 28.8 25.2 114
Cinnabar Park 9707 -M 18.8 * 25.6 27.5 93
Crow Creek 8335 .1 .4 25* 10.9 13.2 83
Deadman Hill 10239 21.0 19.9 106 21.5 21.2 101
Rawah 9069 10.2 6.4 159 19.4 19.4 100
Roach 9740 16.4 16.4 100 23.6 21.6 109
Windy Peak 7915 8.8 3.7 238 14.1 13.2 107
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Basin Index (%) 113 102
S. PLATTE
Crow Creek 8335 .1 .4 25* 10.9 13.2 83
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Basin Index (%) 25* 83
LITTLE SNAKE RIVER
Battle Mountain 7498 7.1 .0 * 24.2 17.6 138
Divide Peak 8730 26.6 15.3 174 31.7 25.0 127
Elk River 8739 18.0 12.6 143 30.3 23.0 132
Elkhead Divide 8800 24.8 -M * 33.6 -M *
Little Snake River 8928 33.9 24.4 139 45.7 36.9 124
Old Battle 9860 41.3 35.2 117 45.5 38.8 117
Sage Creek Basin 7850 17.4 .3 5800* 22.0 14.7 150
Sandstone RS 8152 14.8 5.6 264 27.0 20.1 134
Whiskey Park 9020 35.6 26.8 133 38.7 33.2 117
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Basin Index (%) 162 127
UPPER GREEN RIVER
Big Sandy Opening 9080 14.2 11.1 128 17.3 15.0 115
Blind Bull Sum 8650 25.9 24.6 105 -M 19.4 *
East Rim Divide 7930 5.5 5.9 93 13.0 12.6 103
Elkhart Park G.S. 9400 10.5 10.9 96 13.3 13.8 96
Gros Ventre Summit 8750 11.1 11.7 95 11.9 14.7 81
Gunsight Pass 9820 12.7 13.0 98 15.0 16.2 93
Indian Creek 9425 27.2 22.0 124 26.4 21.4 123
Kendall R.S. 7740 7.3 4.2 174 14.2 14.6 97
Larsen Creek 9000 8.4 3.6 233 16.9 16.1 105
Loomis Park 8240 13.1 11.5 114 17.9 18.6 96
New Fork Lake 8340 6.7 5.6 120 -M 12.2 *
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 10.4 6.8 153 17.4 15.2 114
Spring Creek Divide 9000 -M 25.2 * -M 25.4 *
Triple Peak 8500 21.9 19.1 115 28.4 28.4 100
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Basin Index (%) 117 103
LOWER GREEN RIVER
Blacks Fork Jct 8869 10.7 3.6 297 16.2 14.2 114
Buck Pasture 9632 17.6 -M * 23.8 -M *
EF Blacks Fork GS 9360 9.2 7.8 118 13.5 13.6 99
Hams Fork 7840 9.6 1.9 505 16.4 12.0 137
Henrys Fork 10182 -M -M * 16.9 -M *
Hewinta 9500 8.3 5.2 160 18.1 15.9 114
Hickerson Park 9122 6.6 3.4 194 14.1 12.2 116
Hole-in-Rock 9168 6.5 2.2 295 13.4 12.0 112
Indian Creek 9425 27.2 22.0 124 26.4 21.4 123
Kelley R.S. 8180 18.5 10.9 170 23.9 18.0 133
Spirit Lk 10235 21.3 12.5 170 23.5 19.9 118
Steel Creek Park 10158 20.8 17.6 118 22.2 19.0 117
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Basin Index (%) 159 119
UPPER BEAR RIVER
Bear River RS 8777 6.5 .0 * 17.4 13.8 126
Bug Lake 7987 28.1 13.9 202 26.9 19.4 139
Burts Miller Ranch 8000 1.7 .0 * 15.6 8.7 179
Chalk Creek #1 9171 33.1 21.8 152 34.2 25.8 133
Giveout 6930 10.7 .0 * 17.1 13.8 124
Hayden Fork 9130 17.1 8.6 199 30.0 23.2 129
Kelley R.S. 8180 18.5 10.9 170 23.9 18.0 133
Lily Lake 9133 10.3 10.3 100 18.8 18.2 103
Monte Cristo 8932 44.3 23.9 185 42.7 28.1 152
Salt River Summit 7640 16.7 7.9 211 22.0 17.8 124
Spring Creek Divide 9000 -M 25.2 * -M 25.4 *
Trial Lake 9992 35.9 22.4 160 36.7 24.8 148
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Basin Index (%) 186 135
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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.
