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: OCTOBER 20 , 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 1.4 100
Blind Bull Sum 8650 1.0 .6 167* 2.0 1.0 200
Cottonwood Creek 7670 .1 .0 * 3.4 1.5 227
East Rim Divide 7930 .1 .0 * 1.5 .6 250
Grand Targhee 9260 2.2 2.4 92* 4.8 2.8 171
Granite Creek 6770 -M .0 * 1.6 1.0 160
Grassy Lake 7265 .2 .0 * 2.7 2.0 135
Gros Ventre Summit 8750 1.2 .8 150* 1.2 1.0 120
Gunsight Pass 9820 1.4 .2 700* 2.5 1.2 208
Lewis Lake Divide 7850 .2 .0 * 3.6 1.7 212
Loomis Park 8240 .0 .0 * 1.8 1.2 150
Phillips Bench 8200 .4 .0 * 2.4 1.4 171
Salt River Summit 7640 .0 .0 * 2.7 1.0 270
Snake River Station 6920 .1 .0 * 1.7 1.3 131
Somsen Ranch 6800 .0 .0 * 3.9 1.1 355
Spring Creek Divide 9000 1.5 .5 300* 3.1 1.2 258
Thumb Divide 7980 .9 .0 * 2.0 1.3 154
Togwotee Pass 9580 1.5 -M * 2.2 -M *
Triple Peak 8500 .3 .2 150* 2.8 1.2 233
Two Ocean Plateau 9240 1.5 2.0 75* 1.4 1.6 88
Willow Creek 8080 .2 .0 * 3.9 2.2 177
Younts Peak 8350 .0 -M * .4 -M *
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Basin Index (%) 169* 182
MADISON HEADWATERS IN WYOMING
Black Bear 8170 1.4 1.6 88* 2.4 2.4 100
Canyon 7870 .5 -M * 1.0 -M *
Madison Plateau 7750 1.0 .6 167* 1.7 1.8 94
West Yellowstone 6700 .2 .0 * 1.2 1.0 120
Whiskey Creek 6800 .6 .0 * 1.7 1.2 142
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Basin Index (%) 145* 109
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 .4 1.4 29* .5 1.4 36
Canyon 7870 .5 -M * 1.0 -M *
Evening Star 9200 .3 1.2 25* .5 2.1 24
Fisher Creek 9100 .9 1.4 64* 1.5 1.9 79
Monument Peak 8850 1.2 1.1 109* 2.0 1.7 118
Northeast Entrance 7350 .0 .0 * .9 1.0 90
Parker Peak 9400 .1 1.2 8* .6 1.8 33
Sylvan Lake 8420 .2 -M * 1.8 -M *
Thumb Divide 7980 .9 .0 * 2.0 1.3 154
Two Ocean Plateau 9240 1.5 2.0 75* 1.4 1.6 88
White Mill 8700 .9 1.0 90* 1.1 1.4 79
Wolverine 7650 .0 .0 * .7 1.3 54
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Basin Index (%) 67* 72
WIND RIVER
Burroughs Creek 8750 .1 -M * 1.7 -M *
Castle Creek 8400 .1 .0 * 1.2 .9 133
Cold Springs 9630 -M .0 * -M 1.0 *
Deer Park 9700 2.1 -M * 3.8 -M *
Hobbs Park 10100 3.1 -M * 4.1 -M *
Kirwin 9550 1.4 -M * 1.8 -M *
Little Warm 9370 -M .4 * -M 1.2 *
South Pass 9040 2.2 -M * 3.9 -M *
St. Lawrence Alt 8620 1.7 -M * 3.2 -M *
Togwotee Pass 9580 1.5 -M * 2.2 -M *
Townsend Creek 8700 2.9 -M * 4.0 -M *
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Basin Index (%) * 133*
BIGHORN BASIN
Bald Mtn. 9380 2.6 -M * 3.2 -M *
Bear Trap Meadow 8200 1.1 -M * 2.1 -M *
Bone Springs Div 9350 1.8 -M * 2.4 -M *
Grave Springs 8550 1.2 -M * 2.2 -M *
Kirwin 9550 1.4 -M * 1.8 -M *
Marquette 8760 .9 -M * 2.0 -M *
Middle Powder 7760 1.0 -M * 2.4 -M *
Owl Creek 8975 2.0 -M * 2.4 -M *
Powder River Pass 9480 1.5 -M * 1.7 -M *
Shell Creek 9580 2.0 -M * 2.6 -M *
Timber Creek 7950 1.3 -M * 1.7 -M *
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Basin Index (%) * *
SHOSHONE RIVER
Blackwater 9780 .9 -M * 1.1 -M *
Evening Star 9200 .3 1.2 25* .5 2.1 24
Marquette 8760 .9 -M * 2.0 -M *
Sylvan Lake 8420 .2 -M * 1.8 -M *
Sylvan Road 7120 .0 -M * 1.2 -M *
Younts Peak 8350 .0 -M * .4 -M *
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Basin Index (%) 25* 24
POWDER RIVER
Bear Trap Meadow 8200 1.1 -M * 2.1 -M *
Cloud Peak Reservoir 9860 2.1 -M * 3.6 -M *
Grave Springs 8550 1.2 -M * 2.2 -M *
Hansen Sawmill 8360 2.4 -M * 3.0 -M *
Middle Powder 7760 1.0 -M * 2.4 -M *
Powder River Pass 9480 1.5 -M * 1.7 -M *
Soldier Park 8720 1.9 -M * 3.1 -M *
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Basin Index (%) * *
TONGUE RIVER
Big Goose 7990 1.0 -M * 3.0 -M *
Bone Springs Div 9350 1.8 -M * 2.4 -M *
Burgess Junction 7880 1.2 -M * 2.2 -M *
Dome Lake 8880 1.3 -M * 2.3 -M *
Little Goose 8870 1.2 -M * 3.2 -M *
Sucker Creek 8880 1.6 -M * 2.2 -M *
Tie Creek 6870 1.1 -M * 2.8 -M *
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Basin Index (%) * *
BELLE FOURCHE
Blind Park 6890 .2 .0 * 2.3 1.1 209
Cole Canyon 5910 .9 .0 * 3.0 1.0 300
North Rapid Creek 6130 1.1 .0 * 2.2 .9 244
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Basin Index (%) * 250
CHEYENNE RIVER BASIN
Blind Park 6890 .2 .0 * 2.3 1.1 209
North Rapid Creek 6130 1.1 .0 * 2.2 .9 244
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Basin Index (%) * 225
UPPER N. PLATTE
Arapaho Ridge 10960 1.3 1.0 130* 1.7 1.6 106
Blackhall Mtn 9820 2.0 1.2 167* 3.0 2.4 125
Cinnabar Park 9574 1.1 .5 220* 2.1 1.5 140
Columbine 9160 .0 .0 * -M 1.8 *
Divide Peak 8880 -M .2 * -M 1.8 *
Joe Wright 10120 1.4 .4 350* 2.4 2.3 104
Laprele Creek 8375 1.6 .0 * 2.5 1.0 250
Med Bow 10500 2.5 -M * 3.0 -M *
Never Summer 10280 1.2 1.0 120* 1.7 1.8 94
North French Creek 10130 2.1 .8 262* 3.1 2.0 155
Old Battle 10000 2.1 1.2 175* 3.7 2.3 161
Rawah 9020 .8 .0 * 1.9 1.6 119
Sage Creek Basin 7850 .2 .0 * 1.1 1.1 100
Sand Lake 10050 2.7 1.4 193* 3.2 1.7 188
South Brush Creek 8440 .8 .0 * 1.9 1.0 190
Tower 10500 2.6 1.0 260* 3.1 2.3 135
Webber Springs 9250 .7 .4 175* 2.7 1.8 150
Whiskey Park 8950 1.9 .2 950* 3.4 1.8 189
Willow Creek Pass 9540 .7 .2 350* 1.4 1.2 117
Zirkel 9340 -M .0 * -M 2.2 *
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Basin Index (%) 249* 142
SWEETWATER
Deer Park 9700 2.1 -M * 3.8 -M *
Larsen Creek 9000 .3 .0 * 3.5 .8 438
South Pass 9040 2.2 -M * 3.9 -M *
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Basin Index (%) * 438
LOWER N. PLATTE
Casper Mtn. 7900 2.5 .0 * 4.5 1.2 375
Laprele Creek 8375 1.6 .0 * 2.5 1.0 250
Reno Hill 8400 2.4 .6 400* 4.4 1.3 338
Windy Peak 7900 2.0 .0 * 2.7 1.0 270
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Basin Index (%) 1417* 313
LARAMIE RIVER
Brooklyn Lake 10240 .6 .2 300* 1.9 1.0 190
Cinnabar Park 9574 1.1 .5 220* 2.1 1.5 140
Crow Creek 8330 .6 .0 * 1.4 1.0 140
Deadman Hill 10220 .8 1.2 67* 1.2 1.3 92
Rawah 9020 .8 .0 * 1.9 1.6 119
Roach 9700 1.2 .5 240* 1.8 1.2 150
Windy Peak 7900 2.0 .0 * 2.7 1.0 270
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Basin Index (%) 296* 151
S. PLATTE
Crow Creek 8330 .6 .0 * 1.4 1.0 140
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Basin Index (%) * 140
LITTLE SNAKE RIVER
Battle Mountain 7440 .1 .0 * 2.0 1.2 167
Divide Peak 8880 -M .2 * -M 1.8 *
Elk River 8700 .2 .0 * 2.7 1.4 193
Elkhead Divide 8780 .0 -M * 2.3 -M *
Little Snake River 8915 .1 .0 * 3.3 2.6 127
Old Battle 10000 2.1 1.2 175* 3.7 2.3 161
Sage Creek Basin 7850 .2 .0 * 1.1 1.1 100
Sandstone RS 8150 .2 .0 * 1.9 1.2 158
Whiskey Park 8950 1.9 .2 950* 3.4 1.8 189
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Basin Index (%) 343* 156
UPPER GREEN RIVER
Big Sandy Opening 9080 .2 .6 33* 2.8 1.2 233
Blind Bull Sum 8650 1.0 .6 167* 2.0 1.0 200
East Rim Divide 7930 .1 .0 * 1.5 .6 250
Elkhart Park G.S. 9400 .3 .4 75* 1.9 1.4 136
Gros Ventre Summit 8750 1.2 .8 150* 1.2 1.0 120
Gunsight Pass 9820 1.4 .2 700* 2.5 1.2 208
Indian Creek 9425 1.3 .7 186* 3.0 1.4 214
Kendall R.S. 7740 .0 .0 * 1.7 .8 212
Larsen Creek 9000 .3 .0 * 3.5 .8 438
Loomis Park 8240 .0 .0 * 1.8 1.2 150
New Fork Lake 8340 .0 .0 * 1.7 .7 243
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 .2 .0 * 2.4 .8 300
Spring Creek Divide 9000 1.5 .5 300* 3.1 1.2 258
Triple Peak 8500 .3 .2 150* 2.8 1.2 233
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Basin Index (%) 195* 220
LOWER GREEN RIVER
Blacks Fork Jct 8869 .0 -M * 1.3 -M *
Buck Pasture 9632 .6 -M * 2.8 -M *
EF Blacks Fork GS 9360 .4 -M * 2.4 -M *
Hams Fork 7840 .4 .0 * 3.0 .9 333
Henrys Fork 10182 -M -M * 2.4 -M *
Hewinta 9500 .0 .0 * 1.9 1.2 158
Hickerson Park 9122 .8 .0 * 1.4 .9 156
Hole-in-Rock 9168 .4 .0 * 2.0 1.0 200
Indian Creek 9425 1.3 .7 186* 3.0 1.4 214
Kelley R.S. 8180 .2 .0 * 2.8 1.0 280
Spirit Lk 10235 .7 .0 * 2.4 1.4 171
Steel Creek Park 10158 1.3 .6 217* 2.9 1.2 242
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Basin Index (%) 392* 216
UPPER BEAR RIVER
Bear River RS 8777 .6 -M * 2.1 -M *
Bug Lake 7987 1.3 .0 * 3.4 1.1 309
Burts Miller Ranch 8000 .2 .0 * 1.0 .6 167
Chalk Creek #1 9171 .8 .0 * 3.3 1.4 236
Giveout 6930 .0 .0 * 2.4 .9 267
Hayden Fork 9130 .4 .0 * 3.1 1.4 221
Kelley R.S. 8180 .2 .0 * 2.8 1.0 280
Lily Lake 9133 .8 .0 * 2.6 1.2 217
Monte Cristo 8932 1.3 .0 * 4.0 1.4 286
Salt River Summit 7640 .0 .0 * 2.7 1.0 270
Spring Creek Divide 9000 1.5 .5 300* 3.1 1.2 258
Trial Lake 9992 1.4 .0 * 3.5 1.4 250
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Basin Index (%) 1580* 253
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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.
