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 8 , 2023
------------------------------------------------------------------------------
BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION
Data Site Name (Ft) % %
Current Median Median Current Median Med
------------------------------------------------------------------------------
WYOMING
SNAKE RIVER
Base Camp 7060 11.5 6.6 174 22.7 23.4 97
Blind Bull Sum 8650 25.6 24.0 107 20.2 19.8 102
Cottonwood Creek 7670 20.3 15.4 132 32.0 28.8 111
East Rim Divide 7930 1.6 3.2 50 13.1 13.0 101
Grand Targhee 9260 45.3 46.8 97 33.2 36.6 91
Granite Creek 6770 10.4 6.8 153 16.4 21.2 77
Grassy Lake 7265 30.1 24.1 125 43.0 39.0 110
Gros Ventre Summit 8750 9.7 10.6 92 11.8 14.9 79
Gunsight Pass 9820 11.9 12.4 96 15.1 16.8 90
Lewis Lake Divide 7850 34.4 29.4 117 43.4 37.6 115
Loomis Park 8240 11.7 8.7 134 18.2 19.4 94
Phillips Bench 8200 26.5 24.5 108 32.3 29.0 111
Salt River Summit 7640 14.1 5.7 247 22.5 18.4 122
Snake River Station 6920 9.5 4.1 232 24.9 25.2 99
Somsen Ranch 6800 11.0 .0 * 23.8 18.8 127
Spring Creek Divide 9000 -M 24.2 * -M 26.4 *
Thumb Divide 7980 14.6 9.0 162 21.3 21.7 98
Togwotee Pass 9580 22.3 25.4 88 23.8 28.4 84
Triple Peak 8500 20.1 17.1 118 28.6 29.2 98
Two Ocean Plateau 9240 33.6 32.8 102 30.6 30.4 101
Willow Creek 8080 31.4 25.1 125 40.8 38.7 105
Younts Peak 8350 8.9 13.2 67 15.0 17.6 85
----- -----
Basin Index (%) 117 101
MADISON HEADWATERS IN WYOMING
Black Bear 8170 45.9 41.0 112 47.2 41.4 114
Canyon 7870 11.8 -M * 19.7 -M *
Madison Plateau 7750 28.1 22.4 125 32.8 28.2 116
West Yellowstone 6700 4.2 .0 * 21.0 16.2 130
Whiskey Creek 6800 19.3 11.2 172 28.6 22.8 125
----- -----
Basin Index (%) 131 119
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 20.7 24.8 83 20.7 24.0 86
Canyon 7870 11.8 -M * 19.7 -M *
Evening Star 9200 24.4 27.1 90 31.7 32.2 98
Fisher Creek 9100 35.6 35.9 99 39.0 38.3 102
Monument Peak 8850 20.0 21.8 92 27.0 26.4 102
Northeast Entrance 7350 .6 .0 * 14.3 15.0 95
Parker Peak 9400 25.5 24.3 105 27.2 23.3 117
Sylvan Lake 8420 16.4 18.2 90 26.7 27.2 98
Thumb Divide 7980 14.6 9.0 162 21.3 21.7 98
Two Ocean Plateau 9240 33.6 32.8 102 30.6 30.4 101
White Mill 8700 25.3 26.8 94 26.2 25.8 102
Wolverine 7650 4.3 .6 717* 14.7 14.2 104
----- -----
Basin Index (%) 100 100
WIND RIVER
Burroughs Creek 8750 1.8 -M * 11.8 -M *
Castle Creek 8400 .0 .0 * 8.1 10.6 76
Cold Springs 9630 .1 2.3 4 12.1 11.8 103
Deer Park 9700 23.2 13.6 171 28.7 22.3 129
Hobbs Park 10100 16.9 15.8 107 19.8 17.4 114
Kirwin 9550 7.8 11.8 66 15.0 15.3 98
Little Warm 9370 6.6 7.7 86 14.8 14.4 103
South Pass 9040 18.3 12.2 150 23.6 19.2 123
St. Lawrence Alt 8620 .3 -M * 13.0 -M *
Togwotee Pass 9580 22.3 25.4 88 23.8 28.4 84
Townsend Creek 8700 10.2 6.8 150 16.9 14.4 117
----- -----
Basin Index (%) 110 106
BIGHORN BASIN
Bald Mtn. 9380 18.1 20.6 88 17.5 19.6 89
Bear Trap Meadow 8200 .1 .4 25* 11.3 11.6 97
Bone Springs Div 9350 14.5 17.6 82 14.5 18.8 77
Grave Springs 8550 3.8 6.8 56 12.7 12.6 101
Kirwin 9550 7.8 11.8 66 15.0 15.3 98
Marquette 8760 6.7 7.0 96 12.9 12.8 101
Middle Powder 7760 8.0 9.2 87 11.8 12.8 92
Owl Creek 8975 .0 .8 0 10.4 8.8 118
Powder River Pass 9480 5.0 9.1 55 15.6 16.2 96
Shell Creek 9580 13.8 17.0 81 16.5 17.1 96
Timber Creek 7950 .3 1.8 17 9.5 10.8 88
----- -----
Basin Index (%) 76 94
SHOSHONE RIVER
Blackwater 9780 21.2 26.6 80 25.0 26.4 95
Evening Star 9200 24.4 27.1 90 31.7 32.2 98
Marquette 8760 6.7 7.0 96 12.9 12.8 101
Sylvan Lake 8420 16.4 18.2 90 26.7 27.2 98
Sylvan Road 7120 .1 .2 50* 16.5 18.5 89
Younts Peak 8350 8.9 13.2 67 15.0 17.6 85
----- -----
Basin Index (%) 84 95
POWDER RIVER
Bear Trap Meadow 8200 .1 .4 25* 11.3 11.6 97
Cloud Peak Reservoir 9860 13.6 16.1 84 17.2 18.2 95
Grave Springs 8550 3.8 6.8 56 12.7 12.6 101
Hansen Sawmill 8360 1.9 2.3 83 10.8 11.7 92
Middle Powder 7760 8.0 9.2 87 11.8 12.8 92
Powder River Pass 9480 5.0 9.1 55 15.6 16.2 96
Soldier Park 8720 4.0 1.2 333 10.6 11.9 89
----- -----
Basin Index (%) 81 95
TONGUE RIVER
Big Goose 7990 7.0 8.2 85 12.5 14.0 89
Bone Springs Div 9350 14.5 17.6 82 14.5 18.8 77
Burgess Junction 7880 11.2 11.3 99 16.0 15.6 103
Dome Lake 8880 8.2 11.1 74 13.9 17.2 81
Little Goose 8870 6.8 10.0 68 14.1 16.2 87
Sucker Creek 8880 9.8 12.2 80 18.9 18.6 102
Tie Creek 6870 1.0 1.2 83 14.9 14.6 102
----- -----
Basin Index (%) 82 91
BELLE FOURCHE
Blind Park 6890 .0 .0 * 12.8 13.9 92
Cole Canyon 5910 .0 .0 * 12.3 13.1 94
North Rapid Creek 6130 .5 .0 * 10.6 11.6 91
----- -----
Basin Index (%) * 92
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 12.8 13.9 92
North Rapid Creek 6130 .5 .0 * 10.6 11.6 91
----- -----
Basin Index (%) * 92
UPPER N. PLATTE
Arapaho Ridge 10976 25.4 22.1 115 28.4 25.8 110
Blackhall Mtn 9839 33.9 32.8 103 41.7 36.9 113
Cinnabar Park 9707 -M 17.3 * 25.8 27.5 94
Columbine 9167 16.7 14.0 119 30.0 29.8 101
Divide Peak 8730 22.4 13.2 170 32.2 25.3 127
Joe Wright 10158 24.5 22.2 110 31.6 31.4 101
Laprele Creek 8390 5.4 3.0 180 15.5 15.5 100
Med Bow 10512 41.0 -M * 38.9 -M *
Never Summer 10323 27.0 22.2 122 21.5 20.8 103
North French Creek 10153 28.4 31.6 90 33.5 34.0 99
Old Battle 9860 40.9 35.4 116 46.0 39.7 116
Rawah 9069 7.9 4.2 188 19.8 20.1 99
Sage Creek Basin 7850 12.4 .0 * 22.2 15.3 145
Sand Lake 10098 30.1 31.9 94 32.0 30.4 105
South Brush Creek 8495 4.2 2.6 162 17.0 17.2 99
Tower 10620 54.9 47.2 116 55.7 46.1 121
Webber Springs 9260 25.6 19.6 131 35.4 30.6 116
Whiskey Park 9020 34.9 27.4 127 39.0 34.4 113
Willow Creek Pass 9523 17.5 14.7 119 19.9 16.8 118
Zirkel 9338 22.1 20.4 108 38.0 35.4 107
----- -----
Basin Index (%) 119 110
SWEETWATER
Deer Park 9700 23.2 13.6 171 28.7 22.3 129
Larsen Creek 9000 6.5 .2 3250* 17.3 16.4 105
South Pass 9040 18.3 12.2 150 23.6 19.2 123
----- -----
Basin Index (%) 185 120
LOWER N. PLATTE
Casper Mtn. 7920 6.6 10.4 63 16.0 18.0 89
Laprele Creek 8390 5.4 3.0 180 15.5 15.5 100
Reno Hill 8430 12.6 12.9 98 19.4 20.9 93
Windy Peak 7915 5.7 1.6 356 14.2 13.9 102
----- -----
Basin Index (%) 109 95
LARAMIE RIVER
Brooklyn Lake 10250 19.9 21.8 91 29.0 26.0 112
Cinnabar Park 9707 -M 17.3 * 25.8 27.5 94
Crow Creek 8335 .0 .0 * 11.3 13.6 83
Deadman Hill 10239 18.9 19.4 97 21.8 22.1 99
Rawah 9069 7.9 4.2 188 19.8 20.1 99
Roach 9740 14.2 15.7 90 23.8 22.2 107
Windy Peak 7915 5.7 1.6 356 14.2 13.9 102
----- -----
Basin Index (%) 106 100
S. PLATTE
Crow Creek 8335 .0 .0 * 11.3 13.6 83
----- -----
Basin Index (%) * 83
LITTLE SNAKE RIVER
Battle Mountain 7498 3.2 .0 * 24.4 17.8 137
Divide Peak 8730 22.4 13.2 170 32.2 25.3 127
Elk River 8739 14.7 8.5 173 30.2 23.0 131
Elkhead Divide 8800 20.7 -M * 34.0 -M *
Little Snake River 8928 31.3 20.6 152 46.1 37.6 123
Old Battle 9860 40.9 35.4 116 46.0 39.7 116
Sage Creek Basin 7850 12.4 .0 * 22.2 15.3 145
Sandstone RS 8152 11.8 3.2 369 27.2 20.4 133
Whiskey Park 9020 34.9 27.4 127 39.0 34.4 113
----- -----
Basin Index (%) 158 125
UPPER GREEN RIVER
Big Sandy Opening 9080 13.7 9.6 143 18.2 15.5 117
Blind Bull Sum 8650 25.6 24.0 107 20.2 19.8 102
East Rim Divide 7930 1.6 3.2 50 13.1 13.0 101
Elkhart Park G.S. 9400 10.1 9.7 104 13.7 14.7 93
Gros Ventre Summit 8750 9.7 10.6 92 11.8 14.9 79
Gunsight Pass 9820 11.9 12.4 96 15.1 16.8 90
Indian Creek 9425 27.2 20.9 130 27.0 22.4 121
Kendall R.S. 7740 4.6 .2 2300* 14.5 15.1 96
Larsen Creek 9000 6.5 .2 3250* 17.3 16.4 105
Loomis Park 8240 11.7 8.7 134 18.2 19.4 94
New Fork Lake 8340 4.8 3.4 141 -M 12.6 *
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 8.0 5.6 143 17.7 15.7 113
Spring Creek Divide 9000 -M 24.2 * -M 26.4 *
Triple Peak 8500 20.1 17.1 118 28.6 29.2 98
----- -----
Basin Index (%) 124 101
LOWER GREEN RIVER
Blacks Fork Jct 8869 8.4 .2 4200* 16.6 14.6 114
Buck Pasture 9632 16.3 -M * 24.3 -M *
EF Blacks Fork GS 9360 7.4 5.0 148 13.9 14.2 98
Hams Fork 7840 6.8 .2 3400* 17.2 12.9 133
Henrys Fork 10182 -M -M * 17.5 -M *
Hewinta 9500 7.4 3.0 247 18.5 16.4 113
Hickerson Park 9122 3.3 1.0 330 14.2 12.6 113
Hole-in-Rock 9168 3.4 .5 680* 13.5 12.6 107
Indian Creek 9425 27.2 20.9 130 27.0 22.4 121
Kelley R.S. 8180 16.6 8.5 195 24.6 18.6 132
Spirit Lk 10235 19.1 11.7 163 23.9 20.0 120
Steel Creek Park 10158 19.4 17.2 113 22.8 19.8 115
----- -----
Basin Index (%) 174 117
UPPER BEAR RIVER
Bear River RS 8777 3.8 .0 * 17.8 14.0 127
Bug Lake 7987 26.3 12.6 209 27.5 19.5 141
Burts Miller Ranch 8000 .2 .0 * 15.8 8.8 180
Chalk Creek #1 9171 31.3 20.8 150 34.6 26.4 131
Giveout 6930 7.8 .0 * 17.4 14.6 119
Hayden Fork 9130 14.6 5.5 265 30.6 23.6 130
Kelley R.S. 8180 16.6 8.5 195 24.6 18.6 132
Lily Lake 9133 9.3 7.2 129 19.4 18.6 104
Monte Cristo 8932 42.6 20.6 207 42.3 28.2 150
Salt River Summit 7640 14.1 5.7 247 22.5 18.4 122
Spring Creek Divide 9000 -M 24.2 * -M 26.4 *
Trial Lake 9992 33.4 21.2 158 37.6 25.4 148
----- -----
Basin Index (%) 196 134
-----------------------------------------------------------------------------
-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.
----------------------------------------------------------------------------
-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.
