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 SUNDAY: OCTOBER 17 , 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 .1 .0 * 1.5 1.2 125
Blind Bull Sum 8650 1.0 .2 500* 1.9 1.0 190
Cottonwood Creek 7670 .3 .0 * 3.1 1.4 221
East Rim Divide 7930 .1 .0 * 1.5 .6 250
Grand Targhee 9260 2.3 2.0 115* 4.8 2.6 185
Granite Creek 6770 .0 .0 * 1.5 .8 188
Grassy Lake 7265 .7 .0 * 2.5 1.6 156
Gros Ventre Summit 8750 1.2 .6 200* 1.2 1.0 120
Gunsight Pass 9820 1.0 .2 500* 2.0 1.1 182
Lewis Lake Divide 7850 .9 .0 * 3.6 1.5 240
Loomis Park 8240 .0 .0 * 1.7 .9 189
Phillips Bench 8200 .7 .0 * 2.3 1.3 177
Salt River Summit 7640 .0 .0 * 2.6 .8 325
Snake River Station 6920 .1 .0 * 1.7 1.0 170
Somsen Ranch 6800 .0 .0 * 3.8 .9 422
Spring Creek Divide 9000 1.0 .2 500* 2.5 1.0 250
Thumb Divide 7980 1.0 .0 * 2.0 1.2 167
Togwotee Pass 9580 1.5 -M * 2.2 -M *
Triple Peak 8500 .3 .0 * 2.3 1.2 192
Two Ocean Plateau 9240 1.4 1.5 93* 1.3 1.6 81
Willow Creek 8080 .6 .0 * 3.8 1.9 200
Younts Peak 8350 .2 -M * .3 -M *
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Basin Index (%) 270* 193
MADISON HEADWATERS IN WYOMING
Black Bear 8170 1.4 1.2 117* 2.2 2.1 105
Canyon 7870 .6 -M * 1.0 -M *
Madison Plateau 7750 1.2 .3 400* 1.6 1.7 94
West Yellowstone 6700 .4 .0 * 1.2 .8 150
Whiskey Creek 6800 .7 .0 * 1.5 1.2 125
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Basin Index (%) 247* 112
YELLOWSTONE HEADWATERS IN WYOMING
Beartooth Lake 9360 .4 1.2 33* .6 1.2 50
Canyon 7870 .6 -M * 1.0 -M *
Evening Star 9200 .6 1.0 60* .7 2.0 35
Fisher Creek 9100 .9 1.5 60* 1.4 1.8 78
Monument Peak 8850 1.2 1.0 120* 2.0 1.6 125
Northeast Entrance 7350 .0 .0 * .8 .8 100
Parker Peak 9400 .6 1.2 50* .6 1.6 38
Sylvan Lake 8420 .6 -M * 1.8 -M *
Thumb Divide 7980 1.0 .0 * 2.0 1.2 167
Two Ocean Plateau 9240 1.4 1.5 93* 1.3 1.6 81
White Mill 8700 1.0 1.1 91* 1.1 1.4 79
Wolverine 7650 .0 .0 * .8 1.1 73
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Basin Index (%) 84* 79
WIND RIVER
Burroughs Creek 8750 .4 -M * 1.9 -M *
Castle Creek 8400 .4 .0 * 1.0 .8 125
Cold Springs 9630 -M .0 * -M .8 *
Deer Park 9700 .7 -M * 2.4 -M *
Hobbs Park 10100 .8 -M * 1.8 -M *
Kirwin 9550 .6 -M * 1.2 -M *
Little Warm 9370 .8 .2 400* 1.4 1.0 140
South Pass 9040 .7 -M * 2.2 -M *
St. Lawrence Alt 8620 .6 -M * 1.4 -M *
Togwotee Pass 9580 1.5 -M * 2.2 -M *
Townsend Creek 8700 .7 -M * 1.8 -M *
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Basin Index (%) 600* 133
BIGHORN BASIN
Bald Mtn. 9380 2.7 -M * 3.4 -M *
Bear Trap Meadow 8200 1.1 -M * 1.8 -M *
Bone Springs Div 9350 1.9 -M * 2.5 -M *
Grave Springs 8550 1.0 -M * 2.1 -M *
Kirwin 9550 .6 -M * 1.2 -M *
Marquette 8760 .9 -M * 1.8 -M *
Middle Powder 7760 1.0 -M * 2.1 -M *
Owl Creek 8975 1.2 -M * 1.5 -M *
Powder River Pass 9480 1.4 -M * 1.7 -M *
Shell Creek 9580 2.0 -M * 2.6 -M *
Timber Creek 7950 .8 -M * 1.0 -M *
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Basin Index (%) * *
SHOSHONE RIVER
Blackwater 9780 1.0 -M * 1.2 -M *
Evening Star 9200 .6 1.0 60* .7 2.0 35
Marquette 8760 .9 -M * 1.8 -M *
Sylvan Lake 8420 .6 -M * 1.8 -M *
Sylvan Road 7120 .0 -M * 1.4 -M *
Younts Peak 8350 .2 -M * .3 -M *
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Basin Index (%) 60* 35
POWDER RIVER
Bear Trap Meadow 8200 1.1 -M * 1.8 -M *
Cloud Peak Reservoir 9860 2.1 -M * 3.4 -M *
Grave Springs 8550 1.0 -M * 2.1 -M *
Hansen Sawmill 8360 2.5 -M * 3.0 -M *
Middle Powder 7760 1.0 -M * 2.1 -M *
Powder River Pass 9480 1.4 -M * 1.7 -M *
Soldier Park 8720 2.4 -M * 3.0 -M *
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Basin Index (%) * *
TONGUE RIVER
Big Goose 7990 1.2 -M * 2.9 -M *
Bone Springs Div 9350 1.9 -M * 2.5 -M *
Burgess Junction 7880 1.4 -M * 2.2 -M *
Dome Lake 8880 1.5 -M * 2.5 -M *
Little Goose 8870 1.4 -M * 3.1 -M *
Sucker Creek 8880 1.8 -M * 2.3 -M *
Tie Creek 6870 1.7 -M * 2.7 -M *
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Basin Index (%) * *
BELLE FOURCHE
Blind Park 6890 1.0 .0 * 2.2 1.1 200
Cole Canyon 5910 1.7 .0 * 3.0 .9 333
North Rapid Creek 6130 1.7 .0 * 2.0 .8 250
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Basin Index (%) * 257
CHEYENNE RIVER BASIN
Blind Park 6890 1.0 .0 * 2.2 1.1 200
North Rapid Creek 6130 1.7 .0 * 2.0 .8 250
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Basin Index (%) * 221
UPPER N. PLATTE
Arapaho Ridge 10960 1.1 1.0 110* 1.5 1.6 94
Blackhall Mtn 9820 1.9 .8 238* 2.7 1.5 180
Cinnabar Park 9574 1.0 .0 * 1.9 1.0 190
Columbine 9160 .7 .0 * -M 1.4 *
Divide Peak 8880 -M .1 * -M 1.6 *
Joe Wright 10120 1.6 .2 800* 2.2 1.8 122
Laprele Creek 8375 .7 .0 * 1.3 .8 162
Med Bow 10500 1.6 -M * 2.2 -M *
Never Summer 10280 1.2 .8 150* 1.6 1.6 100
North French Creek 10130 1.2 .3 400* 2.2 1.6 138
Old Battle 10000 2.0 .8 250* 3.5 1.8 194
Rawah 9020 1.2 .0 * 1.8 1.5 120
Sage Creek Basin 7850 .5 .0 * .9 1.0 90
Sand Lake 10050 1.6 1.0 160* 2.1 1.5 140
South Brush Creek 8440 .7 .0 * 1.4 .8 175
Tower 10500 2.5 .4 625* 2.8 2.0 140
Webber Springs 9250 .8 .0 * 2.5 1.4 179
Whiskey Park 8950 1.9 .0 * 3.1 1.6 194
Willow Creek Pass 9540 .6 .0 * 1.3 1.0 130
Zirkel 9340 .0 .0 * -M 1.8 *
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Basin Index (%) 400* 146
SWEETWATER
Deer Park 9700 .7 -M * 2.4 -M *
Larsen Creek 9000 .0 .0 * 3.0 .8 375
South Pass 9040 .7 -M * 2.2 -M *
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Basin Index (%) * 375
LOWER N. PLATTE
Casper Mtn. 7900 1.7 .0 * 3.0 1.0 300
Laprele Creek 8375 .7 .0 * 1.3 .8 162
Reno Hill 8400 1.1 .5 220* 2.5 1.2 208
Windy Peak 7900 1.1 .0 * 1.3 .7 186
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Basin Index (%) 920* 219
LARAMIE RIVER
Brooklyn Lake 10240 .8 .0 * 1.4 .9 156
Cinnabar Park 9574 1.0 .0 * 1.9 1.0 190
Crow Creek 8330 .3 .0 * .8 .8 100
Deadman Hill 10220 .7 .8 88* 1.3 1.2 108
Rawah 9020 1.2 .0 * 1.8 1.5 120
Roach 9700 1.4 .4 350* 1.7 1.1 155
Windy Peak 7900 1.1 .0 * 1.3 .7 186
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Basin Index (%) 542* 142
S. PLATTE
Crow Creek 8330 .3 .0 * .8 .8 100
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Basin Index (%) * 100
LITTLE SNAKE RIVER
Battle Mountain 7440 .1 .0 * 1.7 .9 189
Divide Peak 8880 -M .1 * -M 1.6 *
Elk River 8700 .6 .0 * 2.6 1.2 217
Elkhead Divide 8780 .4 -M * 2.0 -M *
Little Snake River 8915 .4 .0 * 2.9 1.8 161
Old Battle 10000 2.0 .8 250* 3.5 1.8 194
Sage Creek Basin 7850 .5 .0 * .9 1.0 90
Sandstone RS 8150 .6 .0 * 1.7 1.0 170
Whiskey Park 8950 1.9 .0 * 3.1 1.6 194
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Basin Index (%) 762* 176
UPPER GREEN RIVER
Big Sandy Opening 9080 .0 .4 0* 2.7 1.0 270
Blind Bull Sum 8650 1.0 .2 500* 1.9 1.0 190
East Rim Divide 7930 .1 .0 * 1.5 .6 250
Elkhart Park G.S. 9400 .6 .1 600* 1.8 1.2 150
Gros Ventre Summit 8750 1.2 .6 200* 1.2 1.0 120
Gunsight Pass 9820 1.0 .2 500* 2.0 1.1 182
Indian Creek 9425 .7 .4 175* 1.9 1.0 190
Kendall R.S. 7740 .0 .0 * 1.6 .8 200
Larsen Creek 9000 .0 .0 * 3.0 .8 375
Loomis Park 8240 .0 .0 * 1.7 .9 189
New Fork Lake 8340 .0 .0 * 1.6 .7 229
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 .0 .0 * 1.6 .6 267
Spring Creek Divide 9000 1.0 .2 500* 2.5 1.0 250
Triple Peak 8500 .3 .0 * 2.3 1.2 192
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Basin Index (%) 281* 212
LOWER GREEN RIVER
Blacks Fork Jct 8869 .0 -M * .9 -M *
Buck Pasture 9632 .1 -M * 2.1 -M *
EF Blacks Fork GS 9360 .0 -M * 1.6 -M *
Hams Fork 7840 .1 .0 * 1.9 .6 317
Henrys Fork 10182 -M -M * 1.5 -M *
Hewinta 9500 .0 .0 * 1.4 1.0 140
Hickerson Park 9122 .0 .0 * .7 .7 100
Hole-in-Rock 9168 .0 .0 * 1.4 .8 175
Indian Creek 9425 .7 .4 175* 1.9 1.0 190
Kelley R.S. 8180 .1 .0 * 2.3 .7 329
Spirit Lk 10235 .2 .0 * 1.8 1.0 180
Steel Creek Park 10158 .6 .1 600* 2.1 1.0 210
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Basin Index (%) 340* 199
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 1.4 -M *
Bug Lake 7987 .7 .0 * 2.5 .6 417
Burts Miller Ranch 8000 .0 .0 * .7 .4 175
Chalk Creek #1 9171 1.0 .0 * 2.8 1.2 233
Giveout 6930 .0 .0 * 2.4 .8 300
Hayden Fork 9130 .0 .0 * 2.5 1.0 250
Kelley R.S. 8180 .1 .0 * 2.3 .7 329
Lily Lake 9133 .2 .0 * 1.8 1.1 164
Monte Cristo 8932 .9 .0 * 3.3 1.0 330
Salt River Summit 7640 .0 .0 * 2.6 .8 325
Spring Creek Divide 9000 1.0 .2 500* 2.5 1.0 250
Trial Lake 9992 .7 .0 * 2.8 1.1 255
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Basin Index (%) 2300* 270
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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.
