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 SATURDAY: OCTOBER 23 , 2021
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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 .0 .0 * 1.4 1.5 93
Blind Bull Sum 8650 .9 .7 129* 2.0 1.3 154
Cottonwood Creek 7670 .1 .0 * 3.4 1.8 189
East Rim Divide 7930 .1 .0 * 1.5 .9 167
Grand Targhee 9260 2.1 2.5 84* 4.8 3.4 141
Granite Creek 6770 -M .0 * 1.5 1.2 125
Grassy Lake 7265 .0 .2 0* 3.0 2.2 136
Gros Ventre Summit 8750 1.2 .9 133* 1.2 1.3 92
Gunsight Pass 9820 1.4 .6 233* 2.6 1.5 173
Lewis Lake Divide 7850 .0 .0 * 3.7 2.1 176
Loomis Park 8240 .0 .2 0* 1.8 1.4 129
Phillips Bench 8200 .2 .1 200* 2.5 1.9 132
Salt River Summit 7640 .0 .0 * 2.7 1.2 225
Snake River Station 6920 .2 .0 * 1.8 1.4 129
Somsen Ranch 6800 .0 .0 * 3.9 1.3 300
Spring Creek Divide 9000 1.4 .5 280* 3.1 1.2 258
Thumb Divide 7980 .2 .0 * 2.1 1.4 150
Togwotee Pass 9580 1.5 -M * 2.2 -M *
Triple Peak 8500 .2 .4 50* 2.8 1.6 175
Two Ocean Plateau 9240 1.7 2.4 71* 1.4 2.2 64
Willow Creek 8080 .1 .2 50* 3.9 2.4 162
Younts Peak 8350 .1 -M * .7 -M *
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Basin Index (%) 113* 154
MADISON HEADWATERS IN WYOMING
Black Bear 8170 1.2 1.8 67* 2.4 2.8 86
Canyon 7870 -M -M * -M -M *
Madison Plateau 7750 .6 .7 86* 1.6 1.8 89
West Yellowstone 6700 .2 .0 * 1.1 1.1 100
Whiskey Creek 6800 .2 .0 * 1.6 1.4 114
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Basin Index (%) 88* 94
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 .5 1.6 31* .6 1.5 40
Canyon 7870 -M -M * -M -M *
Evening Star 9200 .0 1.3 0* .9 2.3 39
Fisher Creek 9100 .9 1.8 50* 1.8 2.4 75
Monument Peak 8850 1.2 1.3 92* 2.0 1.9 105
Northeast Entrance 7350 .0 .0 * .9 1.2 75
Parker Peak 9400 .0 1.4 0* .7 2.0 35
Sylvan Lake 8420 .0 -M * 1.8 -M *
Thumb Divide 7980 .2 .0 * 2.1 1.4 150
Two Ocean Plateau 9240 1.7 2.4 71* 1.4 2.2 64
White Mill 8700 .9 1.2 75* 1.2 1.8 67
Wolverine 7650 .1 .0 * .8 1.4 57
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Basin Index (%) 50* 69
WIND RIVER
Burroughs Creek 8750 .1 -M * 1.9 -M *
Castle Creek 8400 .1 .0 * 1.2 1.1 109
Cold Springs 9630 -M .3 * -M 1.3 *
Deer Park 9700 2.0 -M * 3.9 -M *
Hobbs Park 10100 3.1 -M * 4.2 -M *
Kirwin 9550 1.6 -M * 2.0 -M *
Little Warm 9370 2.1 .8 262* 2.8 1.3 215
South Pass 9040 2.1 -M * 4.0 -M *
St. Lawrence Alt 8620 1.4 -M * 3.3 -M *
Togwotee Pass 9580 1.5 -M * 2.2 -M *
Townsend Creek 8700 2.7 -M * 4.1 -M *
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Basin Index (%) 275* 167
BIGHORN BASIN
Bald Mtn. 9380 2.8 -M * 3.4 -M *
Bear Trap Meadow 8200 1.1 -M * 2.2 -M *
Bone Springs Div 9350 2.1 -M * 2.5 -M *
Grave Springs 8550 1.2 -M * 2.7 -M *
Kirwin 9550 1.6 -M * 2.0 -M *
Marquette 8760 .7 -M * 2.0 -M *
Middle Powder 7760 .9 -M * 2.5 -M *
Owl Creek 8975 2.0 -M * 2.5 -M *
Powder River Pass 9480 1.4 -M * 1.9 -M *
Shell Creek 9580 2.1 -M * 2.6 -M *
Timber Creek 7950 1.2 -M * 1.8 -M *
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Basin Index (%) * *
SHOSHONE RIVER
Blackwater 9780 1.1 -M * 1.4 -M *
Evening Star 9200 .0 1.3 0* .9 2.3 39
Marquette 8760 .7 -M * 2.0 -M *
Sylvan Lake 8420 .0 -M * 1.8 -M *
Sylvan Road 7120 .0 -M * 2.1 -M *
Younts Peak 8350 .1 -M * .7 -M *
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Basin Index (%) 0* 39
POWDER RIVER
Bear Trap Meadow 8200 1.1 -M * 2.2 -M *
Cloud Peak Reservoir 9860 2.0 -M * 3.7 -M *
Grave Springs 8550 1.2 -M * 2.7 -M *
Hansen Sawmill 8360 2.3 -M * 3.3 -M *
Middle Powder 7760 .9 -M * 2.5 -M *
Powder River Pass 9480 1.4 -M * 1.9 -M *
Soldier Park 8720 2.0 -M * 3.2 -M *
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Basin Index (%) * *
TONGUE RIVER
Big Goose 7990 1.0 -M * 2.9 -M *
Bone Springs Div 9350 2.1 -M * 2.5 -M *
Burgess Junction 7880 1.2 -M * 2.3 -M *
Dome Lake 8880 1.4 -M * 2.7 -M *
Little Goose 8870 1.0 -M * 3.2 -M *
Sucker Creek 8880 1.7 -M * 2.4 -M *
Tie Creek 6870 .5 -M * 2.8 -M *
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Basin Index (%) * *
BELLE FOURCHE
Blind Park 6890 .1 .0 * 2.4 1.3 185
Cole Canyon 5910 .7 .0 * 3.0 1.2 250
North Rapid Creek 6130 1.0 .0 * 2.2 1.1 200
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Basin Index (%) * 211
CHEYENNE RIVER BASIN
Blind Park 6890 .1 .0 * 2.4 1.3 185
North Rapid Creek 6130 1.0 .0 * 2.2 1.1 200
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Basin Index (%) * 192
UPPER N. PLATTE
Arapaho Ridge 10960 1.4 1.6 88* 1.8 2.2 82
Blackhall Mtn 9820 1.9 1.6 119* 3.0 3.2 94
Cinnabar Park 9574 1.1 .8 138* 2.1 1.8 117
Columbine 9160 .0 .0 * -M 2.0 *
Divide Peak 8880 -M .6 * -M 2.3 *
Joe Wright 10120 1.4 .8 175* -M 2.6 *
Laprele Creek 8375 1.6 .0 * 2.7 1.2 225
Med Bow 10500 2.4 -M * 3.1 -M *
Never Summer 10280 1.3 1.6 81* 1.6 1.9 84
North French Creek 10130 2.1 1.1 191* 3.2 2.2 145
Old Battle 10000 2.1 1.2 175* 4.0 2.6 154
Rawah 9020 .8 .3 267* 1.8 2.0 90
Sage Creek Basin 7850 .1 .0 * 1.1 1.7 65
Sand Lake 10050 2.8 2.0 140* 3.4 2.1 162
South Brush Creek 8440 .7 .2 350* 1.9 1.5 127
Tower 10500 2.7 1.2 225* 3.2 2.8 114
Webber Springs 9250 .5 .5 100* 2.8 2.3 122
Whiskey Park 8950 1.8 .4 450* 3.4 2.4 142
Willow Creek Pass 9540 .7 .4 175* 1.4 1.4 100
Zirkel 9340 -M .2 * -M 2.6 *
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Basin Index (%) 168* 119
SWEETWATER
Deer Park 9700 2.0 -M * 3.9 -M *
Larsen Creek 9000 .1 .0 * 3.5 1.2 292
South Pass 9040 2.1 -M * 4.0 -M *
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Basin Index (%) * 292
LOWER N. PLATTE
Casper Mtn. 7900 2.3 .1 2300* 4.7 1.4 336
Laprele Creek 8375 1.6 .0 * 2.7 1.2 225
Reno Hill 8400 2.5 .6 417* 4.7 1.6 294
Windy Peak 7900 1.8 .0 * 3.2 1.1 291
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Basin Index (%) 1171* 289
LARAMIE RIVER
Brooklyn Lake 10240 .3 .3 100* 1.9 1.4 136
Cinnabar Park 9574 1.1 .8 138* 2.1 1.8 117
Crow Creek 8330 .4 .0 * 1.7 1.5 113
Deadman Hill 10220 .9 1.2 75* 1.3 2.0 65
Rawah 9020 .8 .3 267* 1.8 2.0 90
Roach 9700 1.2 .6 200* 1.9 1.8 106
Windy Peak 7900 1.8 .0 * 3.2 1.1 291
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Basin Index (%) 203* 120
S. PLATTE
Crow Creek 8330 .4 .0 * 1.7 1.5 113
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Basin Index (%) * 113
LITTLE SNAKE RIVER
Battle Mountain 7440 .1 .0 * 2.0 1.4 143
Divide Peak 8880 -M .6 * -M 2.3 *
Elk River 8700 .1 .0 * 2.8 1.8 156
Elkhead Divide 8780 -M -M * 2.3 -M *
Little Snake River 8915 .0 .2 0* 3.2 2.8 114
Old Battle 10000 2.1 1.2 175* 4.0 2.6 154
Sage Creek Basin 7850 .1 .0 * 1.1 1.7 65
Sandstone RS 8150 .0 .0 * 2.0 1.5 133
Whiskey Park 8950 1.8 .4 450* 3.4 2.4 142
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Basin Index (%) 233* 130
UPPER GREEN RIVER
Big Sandy Opening 9080 .1 .8 12* 2.8 1.2 233
Blind Bull Sum 8650 .9 .7 129* 2.0 1.3 154
East Rim Divide 7930 .1 .0 * 1.5 .9 167
Elkhart Park G.S. 9400 .3 .6 50* 1.9 1.4 136
Gros Ventre Summit 8750 1.2 .9 133* 1.2 1.3 92
Gunsight Pass 9820 1.4 .6 233* 2.6 1.5 173
Indian Creek 9425 1.3 1.0 130* 3.0 1.6 188
Kendall R.S. 7740 .0 .0 * 1.7 1.2 142
Larsen Creek 9000 .1 .0 * 3.5 1.2 292
Loomis Park 8240 .0 .2 0* 1.8 1.4 129
New Fork Lake 8340 .0 .0 * 1.6 1.0 160
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 .0 .0 * 2.4 1.0 240
Spring Creek Divide 9000 1.4 .5 280* 3.1 1.2 258
Triple Peak 8500 .2 .4 50* 2.8 1.6 175
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Basin Index (%) 123* 179
LOWER GREEN RIVER
Blacks Fork Jct 8869 .2 .0 * 1.3 1.1 118
Buck Pasture 9632 .2 -M * 2.7 -M *
EF Blacks Fork GS 9360 .2 .0 * 2.4 1.2 200
Hams Fork 7840 .1 .0 * 3.0 1.1 273
Henrys Fork 10182 -M -M * 2.1 -M *
Hewinta 9500 .1 .0 * 1.9 1.3 146
Hickerson Park 9122 .2 .0 * 1.3 1.0 130
Hole-in-Rock 9168 .5 .0 * 2.2 1.4 157
Indian Creek 9425 1.3 1.0 130* 3.0 1.6 188
Kelley R.S. 8180 .0 .1 0* 2.9 1.3 223
Spirit Lk 10235 .8 .0 * 2.5 1.4 179
Steel Creek Park 10158 1.3 .7 186* 2.9 1.6 181
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Basin Index (%) 261* 180
UPPER BEAR RIVER
Bear River RS 8777 .1 -M * 2.1 -M *
Bug Lake 7987 1.1 .0 * 3.5 1.3 269
Burts Miller Ranch 8000 .0 .0 * 1.1 .7 157
Chalk Creek #1 9171 1.0 .0 * 3.5 1.8 194
Giveout 6930 .1 .0 * 2.5 1.1 227
Hayden Fork 9130 .0 .0 * 3.1 1.8 172
Kelley R.S. 8180 .0 .1 0* 2.9 1.3 223
Lily Lake 9133 .2 .0 * 2.5 1.5 167
Monte Cristo 8932 1.2 .0 * 4.0 1.7 235
Salt River Summit 7640 .0 .0 * 2.7 1.2 225
Spring Creek Divide 9000 1.4 .5 280* 3.1 1.2 258
Trial Lake 9992 1.2 .2 600* 3.6 1.5 240
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Basin Index (%) 775* 215
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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.
