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 4 , 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 13.3 9.0 148 22.6 22.8 99
Blind Bull Sum 8650 25.6 24.6 104 -M 19.4 *
Cottonwood Creek 7670 21.4 16.4 130 31.1 28.2 110
East Rim Divide 7930 4.3 5.7 75 13.0 12.6 103
Grand Targhee 9260 47.5 46.2 103 32.9 36.1 91
Granite Creek 6770 11.7 9.2 127 16.2 21.0 77
Grassy Lake 7265 31.3 27.4 114 42.3 38.4 110
Gros Ventre Summit 8750 10.6 11.4 93 11.9 14.8 80
Gunsight Pass 9820 12.1 12.8 95 15.0 16.4 91
Lewis Lake Divide 7850 34.7 29.6 117 42.8 37.0 116
Loomis Park 8240 12.5 11.2 112 17.9 18.6 96
Phillips Bench 8200 27.8 26.7 104 32.1 28.8 111
Salt River Summit 7640 16.1 7.4 218 22.1 17.9 123
Snake River Station 6920 11.4 8.2 139 24.6 24.8 99
Somsen Ranch 6800 12.9 .0 * 23.4 18.2 129
Spring Creek Divide 9000 -M 25.1 * -M 25.4 *
Thumb Divide 7980 15.9 11.4 139 20.7 21.2 98
Togwotee Pass 9580 22.1 25.2 88 23.3 27.2 86
Triple Peak 8500 20.8 18.8 111 28.4 28.4 100
Two Ocean Plateau 9240 34.0 32.4 105 30.0 29.8 101
Willow Creek 8080 33.9 26.4 128 40.1 37.4 107
Younts Peak 8350 11.0 14.0 79 14.7 17.4 84
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Basin Index (%) 115 102
MADISON HEADWATERS IN WYOMING
Black Bear 8170 46.2 39.8 116 45.8 41.2 111
Canyon 7870 12.6 -M * 18.8 -M *
Madison Plateau 7750 30.2 23.0 131 31.9 28.0 114
West Yellowstone 6700 6.9 .0 * 20.4 15.8 129
Whiskey Creek 6800 20.2 12.6 160 27.7 22.7 122
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Basin Index (%) 137 117
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 20.8 23.8 87 20.4 23.2 88
Canyon 7870 12.6 -M * 18.8 -M *
Evening Star 9200 24.7 26.6 93 31.3 31.8 98
Fisher Creek 9100 36.1 35.8 101 38.2 37.2 103
Monument Peak 8850 20.9 21.8 96 26.7 25.8 103
Northeast Entrance 7350 2.4 1.4 171 13.9 14.6 95
Parker Peak 9400 26.6 24.4 109 26.8 22.8 118
Sylvan Lake 8420 17.2 19.2 90 26.1 26.4 99
Thumb Divide 7980 15.9 11.4 139 20.7 21.2 98
Two Ocean Plateau 9240 34.0 32.4 105 30.0 29.8 101
White Mill 8700 25.3 26.6 95 25.6 25.7 100
Wolverine 7650 6.9 3.6 192 14.4 14.0 103
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Basin Index (%) 102 101
WIND RIVER
Burroughs Creek 8750 4.3 -M * 11.6 -M *
Castle Creek 8400 .1 .0 * 8.1 9.8 83
Cold Springs 9630 2.7 3.6 75 12.0 11.4 105
Deer Park 9700 24.7 15.0 165 28.6 22.0 130
Hobbs Park 10100 17.8 16.6 107 19.6 16.8 117
Kirwin 9550 8.8 11.4 77 14.7 14.4 102
Little Warm 9370 7.7 8.9 87 14.5 13.4 108
South Pass 9040 19.7 14.4 137 23.4 18.4 127
St. Lawrence Alt 8620 3.5 -M * 13.0 -M *
Togwotee Pass 9580 22.1 25.2 88 23.3 27.2 86
Townsend Creek 8700 12.1 8.6 141 16.9 13.7 123
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Basin Index (%) 112 110
BIGHORN BASIN
Bald Mtn. 9380 18.6 20.6 90 17.2 18.9 91
Bear Trap Meadow 8200 .6 .7 86 11.0 11.4 96
Bone Springs Div 9350 15.2 17.6 86 14.0 18.4 76
Grave Springs 8550 5.8 8.6 67 12.7 12.2 104
Kirwin 9550 8.8 11.4 77 14.7 14.4 102
Marquette 8760 7.8 7.8 100 12.4 12.2 102
Middle Powder 7760 9.5 10.6 90 11.6 12.6 92
Owl Creek 8975 .1 .7 14 10.4 8.5 122
Powder River Pass 9480 6.3 9.4 67 15.5 15.2 102
Shell Creek 9580 13.9 16.0 87 16.1 16.2 99
Timber Creek 7950 1.5 2.5 60 9.4 10.4 90
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Basin Index (%) 83 96
SHOSHONE RIVER
Blackwater 9780 20.7 25.8 80 24.8 26.0 95
Evening Star 9200 24.7 26.6 93 31.3 31.8 98
Marquette 8760 7.8 7.8 100 12.4 12.2 102
Sylvan Lake 8420 17.2 19.2 90 26.1 26.4 99
Sylvan Road 7120 .0 3.2 0 16.1 18.3 88
Younts Peak 8350 11.0 14.0 79 14.7 17.4 84
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Basin Index (%) 84 95
POWDER RIVER
Bear Trap Meadow 8200 .6 .7 86 11.0 11.4 96
Cloud Peak Reservoir 9860 14.6 16.3 90 16.8 17.2 98
Grave Springs 8550 5.8 8.6 67 12.7 12.2 104
Hansen Sawmill 8360 4.2 3.6 117 10.6 11.1 95
Middle Powder 7760 9.5 10.6 90 11.6 12.6 92
Powder River Pass 9480 6.3 9.4 67 15.5 15.2 102
Soldier Park 8720 -M 3.0 * -M 11.4 *
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Basin Index (%) 83 98
TONGUE RIVER
Big Goose 7990 8.1 8.5 95 12.1 13.4 90
Bone Springs Div 9350 15.2 17.6 86 14.0 18.4 76
Burgess Junction 7880 12.1 11.2 108 15.5 14.8 105
Dome Lake 8880 9.2 11.2 82 13.5 16.1 84
Little Goose 8870 7.9 10.5 75 13.7 16.1 85
Sucker Creek 8880 11.3 11.3 100 18.6 17.6 106
Tie Creek 6870 3.8 2.0 190 14.6 13.9 105
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Basin Index (%) 93 92
BELLE FOURCHE
Blind Park 6890 .0 .0 * 12.8 13.6 94
Cole Canyon 5910 1.3 .4 325* 12.1 12.0 101
North Rapid Creek 6130 .6 .0 * 10.5 11.0 95
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Basin Index (%) 475* 97
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 12.8 13.6 94
North Rapid Creek 6130 .6 .0 * 10.5 11.0 95
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Basin Index (%) * 95
UPPER N. PLATTE
Arapaho Ridge 10976 25.5 22.4 114 27.8 25.5 109
Blackhall Mtn 9839 35.2 31.8 111 41.2 35.9 115
Cinnabar Park 9707 -M 18.3 * 25.6 27.5 93
Columbine 9167 19.8 17.2 115 29.7 29.3 101
Divide Peak 8730 25.2 14.8 170 31.7 25.1 126
Joe Wright 10158 25.9 22.6 115 30.9 30.8 100
Laprele Creek 8390 7.6 5.4 141 15.4 15.0 103
Med Bow 10512 41.5 -M * 38.5 -M *
Never Summer 10323 27.2 22.7 120 21.1 20.6 102
North French Creek 10153 30.4 32.6 93 33.2 33.0 101
Old Battle 9860 40.6 35.2 115 45.6 38.8 118
Rawah 9069 9.3 6.0 155 19.4 19.4 100
Sage Creek Basin 7850 15.9 .1 15900* 22.0 14.7 150
Sand Lake 10098 30.4 31.9 95 31.6 29.4 107
South Brush Creek 8495 6.5 6.2 105 16.7 16.8 99
Tower 10620 54.5 47.8 114 55.0 45.2 122
Webber Springs 9260 27.3 21.0 130 35.2 30.0 117
Whiskey Park 9020 34.9 26.8 130 38.7 33.2 117
Willow Creek Pass 9523 18.2 15.2 120 19.6 16.6 118
Zirkel 9338 24.4 22.0 111 37.6 35.1 107
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Basin Index (%) 120 111
SWEETWATER
Deer Park 9700 24.7 15.0 165 28.6 22.0 130
Larsen Creek 9000 7.6 3.2 238 16.9 16.1 105
South Pass 9040 19.7 14.4 137 23.4 18.4 127
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Basin Index (%) 160 122
LOWER N. PLATTE
Casper Mtn. 7920 8.7 12.0 72 15.7 17.8 88
Laprele Creek 8390 7.6 5.4 141 15.4 15.0 103
Reno Hill 8430 14.6 13.7 107 19.3 18.9 102
Windy Peak 7915 7.9 3.8 208 14.1 13.4 105
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Basin Index (%) 111 99
LARAMIE RIVER
Brooklyn Lake 10250 21.8 22.8 96 28.7 25.3 113
Cinnabar Park 9707 -M 18.3 * 25.6 27.5 93
Crow Creek 8335 .1 .2 50* 10.8 13.2 82
Deadman Hill 10239 20.0 19.7 102 21.5 21.4 100
Rawah 9069 9.3 6.0 155 19.4 19.4 100
Roach 9740 15.6 16.6 94 23.6 21.8 108
Windy Peak 7915 7.9 3.8 208 14.1 13.4 105
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Basin Index (%) 108 101
S. PLATTE
Crow Creek 8335 .1 .2 50* 10.8 13.2 82
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Basin Index (%) 50* 82
LITTLE SNAKE RIVER
Battle Mountain 7498 6.0 .0 * 24.2 17.6 138
Divide Peak 8730 25.2 14.8 170 31.7 25.1 126
Elk River 8739 17.1 11.8 145 30.3 23.0 132
Elkhead Divide 8800 23.7 -M * 33.6 -M *
Little Snake River 8928 32.8 23.5 140 45.6 37.1 123
Old Battle 9860 40.6 35.2 115 45.6 38.8 118
Sage Creek Basin 7850 15.9 .1 15900* 22.0 14.7 150
Sandstone RS 8152 13.9 5.0 278 27.0 20.2 134
Whiskey Park 9020 34.9 26.8 130 38.7 33.2 117
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Basin Index (%) 159 126
UPPER GREEN RIVER
Big Sandy Opening 9080 13.5 10.6 127 17.3 15.0 115
Blind Bull Sum 8650 25.6 24.6 104 -M 19.4 *
East Rim Divide 7930 4.3 5.7 75 13.0 12.6 103
Elkhart Park G.S. 9400 9.8 10.6 92 13.3 13.9 96
Gros Ventre Summit 8750 10.6 11.4 93 11.9 14.8 80
Gunsight Pass 9820 12.1 12.8 95 15.0 16.4 91
Indian Creek 9425 26.7 21.6 124 26.4 21.6 122
Kendall R.S. 7740 6.4 3.7 173 14.2 14.7 97
Larsen Creek 9000 7.6 3.2 238 16.9 16.1 105
Loomis Park 8240 12.5 11.2 112 17.9 18.6 96
New Fork Lake 8340 5.8 5.1 114 -M 12.2 *
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 9.7 6.7 145 17.3 15.2 114
Spring Creek Divide 9000 -M 25.1 * -M 25.4 *
Triple Peak 8500 20.8 18.8 111 28.4 28.4 100
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Basin Index (%) 113 102
LOWER GREEN RIVER
Blacks Fork Jct 8869 9.9 2.8 354 16.3 14.4 113
Buck Pasture 9632 16.6 -M * 23.8 -M *
EF Blacks Fork GS 9360 8.6 7.4 116 13.5 13.6 99
Hams Fork 7840 8.8 .9 978* 16.6 12.1 137
Henrys Fork 10182 -M -M * 17.0 -M *
Hewinta 9500 7.9 4.5 176 18.1 16.1 112
Hickerson Park 9122 5.8 3.0 193 14.1 12.3 115
Hole-in-Rock 9168 5.6 2.0 280 13.4 12.0 112
Indian Creek 9425 26.7 21.6 124 26.4 21.6 122
Kelley R.S. 8180 17.6 10.4 169 24.0 18.1 133
Spirit Lk 10235 20.4 12.6 162 23.5 19.9 118
Steel Creek Park 10158 19.9 17.6 113 22.3 19.2 116
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Basin Index (%) 158 118
UPPER BEAR RIVER
Bear River RS 8777 5.7 .0 * 17.5 13.8 127
Bug Lake 7987 27.2 13.8 197 26.9 19.5 138
Burts Miller Ranch 8000 .6 .0 * 15.6 8.7 179
Chalk Creek #1 9171 32.4 22.0 147 34.2 26.0 132
Giveout 6930 9.9 .0 * 17.1 13.8 124
Hayden Fork 9130 15.9 8.2 194 30.1 23.4 129
Kelley R.S. 8180 17.6 10.4 169 24.0 18.1 133
Lily Lake 9133 9.7 9.7 100 18.9 18.4 103
Monte Cristo 8932 43.7 23.0 190 42.7 28.1 152
Salt River Summit 7640 16.1 7.4 218 22.1 17.9 123
Spring Creek Divide 9000 -M 25.1 * -M 25.4 *
Trial Lake 9992 34.3 22.0 156 36.7 25.0 147
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Basin Index (%) 183 134
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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.
