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: APRIL 20 , 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 19.0 14.6 130 22.1 21.4 103
Blind Bull Sum 8650 26.6 25.4 105 19.6 18.6 105
Cottonwood Creek 7670 25.9 20.6 126 29.4 26.7 110
East Rim Divide 7930 11.6 9.4 123 12.5 11.7 107
Grand Targhee 9260 49.1 46.6 105 -M 34.6 *
Granite Creek 6770 18.5 12.5 148 16.1 19.6 82
Grassy Lake 7265 36.8 32.9 112 41.5 37.3 111
Gros Ventre Summit 8750 12.8 13.2 97 11.7 13.4 87
Gunsight Pass 9820 14.6 13.6 107 14.0 14.8 95
Lewis Lake Divide 7850 39.1 33.3 117 42.1 35.0 120
Loomis Park 8240 17.3 13.4 129 17.7 17.4 102
Phillips Bench 8200 30.5 26.6 115 31.7 27.5 115
Salt River Summit 7640 20.8 11.2 186 21.0 17.1 123
Snake River Station 6920 18.6 15.3 122 23.9 23.3 103
Somsen Ranch 6800 -M 7.2 * -M 17.4 *
Spring Creek Divide 9000 29.5 25.3 117 -M 24.5 *
Thumb Divide 7980 21.1 16.7 126 20.4 19.6 104
Togwotee Pass 9580 23.3 24.9 94 22.2 26.1 85
Triple Peak 8500 26.6 21.8 122 27.3 26.8 102
Two Ocean Plateau 9240 34.3 32.3 106 29.1 28.4 102
Willow Creek 8080 38.7 28.8 134 38.3 35.2 109
Younts Peak 8350 16.1 15.2 106 14.1 16.3 87
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Basin Index (%) 117 104
MADISON HEADWATERS IN WYOMING
Black Bear 8170 44.7 39.6 113 45.9 39.0 118
Canyon 7870 15.0 -M * 18.2 -M *
Madison Plateau 7750 31.6 23.5 134 31.5 25.8 122
West Yellowstone 6700 15.5 6.9 225 20.1 15.4 131
Whiskey Creek 6800 22.1 15.8 140 27.4 21.5 127
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Basin Index (%) 133 123
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 20.7 23.7 87 19.6 21.9 89
Canyon 7870 15.0 -M * 18.2 -M *
Evening Star 9200 27.8 27.1 103 30.3 30.4 100
Fisher Creek 9100 35.8 35.4 101 36.9 35.4 104
Monument Peak 8850 23.2 22.1 105 25.9 23.6 110
Northeast Entrance 7350 8.9 7.3 122 13.6 13.9 98
Parker Peak 9400 27.9 23.3 120 25.9 21.2 122
Sylvan Lake 8420 21.1 20.9 101 25.7 24.8 104
Thumb Divide 7980 21.1 16.7 126 20.4 19.6 104
Two Ocean Plateau 9240 34.3 32.3 106 29.1 28.4 102
White Mill 8700 26.1 26.0 100 24.8 24.2 102
Wolverine 7650 12.5 8.0 156 13.5 13.1 103
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Basin Index (%) 107 104
WIND RIVER
Burroughs Creek 8750 10.3 -M * 11.5 -M *
Castle Creek 8400 4.7 4.5 104 7.4 9.0 82
Cold Springs 9630 7.8 6.2 126 10.9 9.8 111
Deer Park 9700 24.9 16.0 156 25.7 20.3 127
Hobbs Park 10100 17.3 15.8 109 16.4 14.6 112
Kirwin 9550 10.5 12.0 88 13.8 13.6 101
Little Warm 9370 11.2 10.4 108 13.9 12.7 109
South Pass 9040 20.3 15.6 130 20.8 17.3 120
St. Lawrence Alt 8620 6.4 -M * 11.0 -M *
Togwotee Pass 9580 23.3 24.9 94 22.2 26.1 85
Townsend Creek 8700 12.8 9.7 132 14.4 13.0 111
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Basin Index (%) 115 107
BIGHORN BASIN
Bald Mtn. 9380 19.6 19.8 99 16.6 17.0 98
Bear Trap Meadow 8200 8.1 4.0 202 10.6 10.2 104
Bone Springs Div 9350 16.8 17.6 95 13.3 17.0 78
Grave Springs 8550 9.4 8.4 112 12.1 11.0 110
Kirwin 9550 10.5 12.0 88 13.8 13.6 101
Marquette 8760 9.4 8.1 116 11.0 10.6 104
Middle Powder 7760 12.5 11.8 106 10.9 11.0 99
Owl Creek 8975 6.3 4.2 150 9.5 7.2 132
Powder River Pass 9480 10.3 11.0 94 14.8 14.3 103
Shell Creek 9580 14.6 16.8 87 15.3 15.0 102
Timber Creek 7950 5.6 5.4 104 8.3 9.0 92
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Basin Index (%) 103 100
SHOSHONE RIVER
Blackwater 9780 23.3 25.1 93 23.6 23.8 99
Evening Star 9200 27.8 27.1 103 30.3 30.4 100
Marquette 8760 9.4 8.1 116 11.0 10.6 104
Sylvan Lake 8420 21.1 20.9 101 25.7 24.8 104
Sylvan Road 7120 8.3 9.8 85 16.0 17.6 91
Younts Peak 8350 16.1 15.2 106 14.1 16.3 87
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Basin Index (%) 100 98
POWDER RIVER
Bear Trap Meadow 8200 8.1 4.0 202 10.6 10.2 104
Cloud Peak Reservoir 9860 15.7 15.8 99 15.9 15.0 106
Grave Springs 8550 9.4 8.4 112 12.1 11.0 110
Hansen Sawmill 8360 7.6 5.2 146 10.2 9.8 104
Middle Powder 7760 12.5 11.8 106 10.9 11.0 99
Powder River Pass 9480 10.3 11.0 94 14.8 14.3 103
Soldier Park 8720 7.9 6.7 118 9.6 10.8 89
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Basin Index (%) 114 102
TONGUE RIVER
Big Goose 7990 10.3 8.8 117 11.7 11.0 106
Bone Springs Div 9350 16.8 17.6 95 13.3 17.0 78
Burgess Junction 7880 12.3 11.7 105 14.4 13.5 107
Dome Lake 8880 10.9 11.6 94 12.8 14.6 88
Little Goose 8870 10.3 10.8 95 13.0 13.8 94
Sucker Creek 8880 12.8 13.0 98 17.4 15.6 112
Tie Creek 6870 8.0 4.0 200 13.8 12.5 110
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Basin Index (%) 105 98
BELLE FOURCHE
Blind Park 6890 5.0 4.4 114 12.0 12.4 97
Cole Canyon 5910 5.5 2.6 212 11.3 10.1 112
North Rapid Creek 6130 4.8 4.0 120 10.0 10.2 98
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Basin Index (%) 139 102
CHEYENNE RIVER BASIN
Blind Park 6890 5.0 4.4 114 12.0 12.4 97
North Rapid Creek 6130 4.8 4.0 120 10.0 10.2 98
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Basin Index (%) 117 97
UPPER N. PLATTE
Arapaho Ridge 10976 26.4 23.4 113 25.8 23.5 110
Blackhall Mtn 9839 37.6 32.9 114 39.3 31.8 124
Cinnabar Park 9707 -M 20.0 * 24.1 24.6 98
Columbine 9167 26.0 21.2 123 27.6 27.0 102
Divide Peak 8730 28.2 19.4 145 30.3 23.3 130
Joe Wright 10158 25.8 21.7 119 29.6 28.3 105
Laprele Creek 8390 11.5 8.2 140 14.1 13.0 108
Med Bow 10512 39.8 -M * 36.2 -M *
Never Summer 10323 27.3 21.9 125 20.0 18.4 109
North French Creek 10153 30.0 31.4 96 31.3 29.6 106
Old Battle 9860 43.3 33.2 130 43.3 35.9 121
Rawah 9069 13.4 10.4 129 18.3 17.1 107
Sage Creek Basin 7850 24.6 6.5 378 21.2 13.8 154
Sand Lake 10098 29.3 30.2 97 29.2 26.8 109
South Brush Creek 8495 12.3 8.9 138 15.2 14.7 103
Tower 10620 52.6 46.2 114 52.5 41.8 126
Webber Springs 9260 29.6 22.2 133 33.4 27.4 122
Whiskey Park 9020 37.5 26.2 143 37.0 29.7 125
Willow Creek Pass 9523 19.2 14.6 132 18.7 14.7 127
Zirkel 9338 30.0 25.3 119 36.1 33.2 109
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Basin Index (%) 125 115
SWEETWATER
Deer Park 9700 24.9 16.0 156 25.7 20.3 127
Larsen Creek 9000 10.3 8.6 120 15.0 15.1 99
South Pass 9040 20.3 15.6 130 20.8 17.3 120
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Basin Index (%) 138 117
LOWER N. PLATTE
Casper Mtn. 7920 14.4 14.4 100 15.3 15.5 99
Laprele Creek 8390 11.5 8.2 140 14.1 13.0 108
Reno Hill 8430 16.2 14.1 115 17.7 17.0 104
Windy Peak 7915 10.6 6.8 156 13.2 11.4 116
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Basin Index (%) 121 106
LARAMIE RIVER
Brooklyn Lake 10250 24.9 22.0 113 26.7 23.6 113
Cinnabar Park 9707 -M 20.0 * 24.1 24.6 98
Crow Creek 8335 2.9 2.9 100 9.5 11.8 81
Deadman Hill 10239 20.1 17.6 114 19.4 19.6 99
Rawah 9069 13.4 10.4 129 18.3 17.1 107
Roach 9740 17.5 16.6 105 21.8 20.4 107
Windy Peak 7915 10.6 6.8 156 13.2 11.4 116
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Basin Index (%) 117 104
S. PLATTE
Crow Creek 8335 2.9 2.9 100 9.5 11.8 81
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Basin Index (%) 100 81
LITTLE SNAKE RIVER
Battle Mountain 7498 14.3 5.8 247 23.3 16.2 144
Divide Peak 8730 28.2 19.4 145 30.3 23.3 130
Elk River 8739 24.9 15.2 164 28.7 20.7 139
Elkhead Divide 8800 30.0 -M * -M -M *
Little Snake River 8928 37.1 24.2 153 44.0 34.4 128
Old Battle 9860 43.3 33.2 130 43.3 35.9 121
Sage Creek Basin 7850 24.6 6.5 378 21.2 13.8 154
Sandstone RS 8152 22.3 9.8 228 26.0 18.8 138
Whiskey Park 9020 37.5 26.2 143 37.0 29.7 125
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Basin Index (%) 166 132
UPPER GREEN RIVER
Big Sandy Opening 9080 15.1 13.6 111 16.1 13.9 116
Blind Bull Sum 8650 26.6 25.4 105 19.6 18.6 105
East Rim Divide 7930 11.6 9.4 123 12.5 11.7 107
Elkhart Park G.S. 9400 12.7 12.8 99 12.4 13.1 95
Gros Ventre Summit 8750 12.8 13.2 97 11.7 13.4 87
Gunsight Pass 9820 14.6 13.6 107 14.0 14.8 95
Indian Creek 9425 29.7 24.7 120 25.5 20.3 126
Kendall R.S. 7740 12.2 9.2 133 13.8 13.7 101
Larsen Creek 9000 10.3 8.6 120 15.0 15.1 99
Loomis Park 8240 17.3 13.4 129 17.7 17.4 102
New Fork Lake 8340 11.0 9.4 117 -M 11.2 *
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 14.3 10.6 135 16.7 14.3 117
Spring Creek Divide 9000 29.5 25.3 117 -M 24.5 *
Triple Peak 8500 26.6 21.8 122 27.3 26.8 102
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Basin Index (%) 116 105
LOWER GREEN RIVER
Blacks Fork Jct 8869 13.1 7.1 185 15.3 13.4 114
Buck Pasture 9632 20.6 -M * 22.7 -M *
EF Blacks Fork GS 9360 12.4 11.0 113 12.4 12.6 98
Hams Fork 7840 15.6 7.6 205 15.7 11.5 137
Henrys Fork 10182 -M -M * 16.4 -M *
Hewinta 9500 11.9 8.2 145 17.2 14.9 115
Hickerson Park 9122 9.8 5.6 175 13.2 11.2 118
Hole-in-Rock 9168 8.9 5.9 151 12.7 10.8 118
Indian Creek 9425 29.7 24.7 120 25.5 20.3 126
Kelley R.S. 8180 22.2 14.2 156 22.9 17.2 133
Spirit Lk 10235 22.3 12.8 174 22.1 19.0 116
Steel Creek Park 10158 21.5 16.0 134 21.2 17.3 123
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Basin Index (%) 148 120
UPPER BEAR RIVER
Bear River RS 8777 13.0 3.6 361 16.8 12.8 131
Bug Lake 7987 31.1 17.4 179 25.9 18.8 138
Burts Miller Ranch 8000 7.8 .0 * 14.9 8.6 173
Chalk Creek #1 9171 34.0 22.8 149 32.9 24.1 137
Giveout 6930 14.9 2.9 514 16.2 13.2 123
Hayden Fork 9130 23.6 11.7 202 28.8 21.9 132
Kelley R.S. 8180 22.2 14.2 156 22.9 17.2 133
Lily Lake 9133 15.3 11.4 134 18.1 16.0 113
Monte Cristo 8932 46.1 26.3 175 41.9 27.0 155
Salt River Summit 7640 20.8 11.2 186 21.0 17.1 123
Spring Creek Divide 9000 29.5 25.3 117 -M 24.5 *
Trial Lake 9992 38.2 22.8 168 35.6 23.3 153
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Basin Index (%) 175 138
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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.
