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 FRIDAY: SEPTEMBER 22 , 2017
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BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION
Data Site Name (Ft) % %
Current Median Median Current Average Avg
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WYOMING
SNAKE RIVER
Base Camp 7030 .2 .0 * 51.6 31.5 164
Black Bear 8170 2.4 .0 * 72.3 54.3 133
Blind Bull Sum 8650 .9 .0 * 46.7 30.3 154
Cottonwood Creek 7670 .1 .0 * 53.5 38.4 139
East Rim Divide 7930 .2 .0 * 29.6 19.6 151
Grand Targhee 9260 1.9 .0 * 64.4 47.1 137
Granite Creek 6770 .1 .0 * 47.8 29.2 164
Grassy Lake 7265 .8 .0 * 71.9 51.5 140
Gros Ventre Summit 8750 .2 .0 * 35.2 23.0 153
Gunsight Pass 9820 1.3 .0 * -M 25.3 *
Lewis Lake Divide 7850 1.1 .0 * 73.1 50.0 146
Phillips Bench 8200 .1 .0 * 59.5 40.8 146
Salt River Summit 7760 .1 .0 * 36.0 26.2 137
Snake River Station 6920 .1 .0 * 48.3 34.5 140
Spring Creek Divide 9000 .4 .0 * 51.5 35.2 146
Thumb Divide 7980 1.3 .0 * 40.3 29.2 138
Togwotee Pass 9580 2.1 .0 * 54.6 38.1 143
Two Ocean Plateau 9240 -M .0 * 66.8 42.5 157
Willow Creek 8380 .5 .0 * 68.0 51.0 133
Younts Peak 8350 1.3 .0 * 46.7 28.7 163
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Basin Index (%) * 145
MADISON-GALLATIN
Black Bear 8170 2.4 .0 * 72.3 54.3 133
Canyon 7870 1.2 .0 * 37.1 27.2 136
Madison Plateau 7750 1.7 .0 * 50.2 40.0 126
West Yellowstone 6700 .3 .0 * 34.0 23.7 143
Whiskey Creek 6800 .3 .0 * 38.8 32.4 120
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Basin Index (%) * 131
YELLOWSTONE
Beartooth Lake 9360 1.5 .0 * 42.4 32.4 131
Burnt Mtn 5880 .8 .0 * 30.1 29.1 103
Canyon 7870 1.2 .0 * 37.1 27.2 136
Cole Creek 7850 1.8 .0 * 24.7 30.5 81
Evening Star 9200 2.8 .0 * 61.7 44.2 140
Fisher Creek 9100 3.3 .0 * 66.0 50.8 130
Northeast Entrance 7350 .9 .0 * 32.2 24.4 132
Parker Peak 9400 -M .0 * -M 31.2 *
Sylvan Lake 8420 -M .0 * -M 37.4 *
Thumb Divide 7980 1.3 .0 * 40.3 29.2 138
Two Ocean Plateau 9240 -M .0 * 66.8 42.5 157
White Mill 8700 -M .0 * -M 39.7 *
Wolverine 7650 .5 .0 * 32.6 23.0 142
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Basin Index (%) * 130
WIND RIVER
Burroughs Creek 8750 .5 -M * 36.0 -M *
Castle Creek 8400 .0 -M * 27.4 -M *
Cold Springs 9630 .5 .0 * 30.0 21.2 142
Deer Park 9700 .0 .0 * 52.7 34.3 154
Hobbs Park 10100 .0 .0 * 44.3 27.1 163
Kirwin 9550 1.0 .0 * 39.0 25.7 152
Little Warm 9370 1.2 .0 * 35.4 25.3 140
Owl Creek 8975 .0 .0 * 26.4 16.8 157
South Pass 9040 .0 .0 * 42.5 29.0 147
St. Lawrence Alt 8620 .1 .0 * 28.5 19.8 144
Togwotee Pass 9580 2.1 .0 * 54.6 38.1 143
Townsend Creek 8700 .1 .0 * 37.8 24.0 158
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Basin Index (%) * 150
BIGHORN BASIN
Bald Mtn. 9380 1.3 .0 * 30.3 31.5 96
Bear Trap Meadow 8200 .0 .0 * 22.5 20.2 111
Bone Springs Div 9350 .0 .0 * 34.4 30.6 112
Grave Springs 8550 .0 .0 * 18.2 22.5 81
Kirwin 9550 1.0 .0 * 39.0 25.7 152
Marquette 8760 .5 -M * 33.0 -M *
Middle Powder 7760 .0 .0 * 18.7 24.3 77
Owl Creek 8975 .0 .0 * 26.4 16.8 157
Powder River Pass 9480 .2 .0 * 29.6 26.1 113
Shell Creek 9580 1.0 .0 * 28.9 27.7 104
Timber Creek 7950 .2 .0 * 25.3 20.8 122
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Basin Index (%) * 111
SHOSHONE RIVER
Blackwater 9780 2.6 .0 * 59.0 35.6 166
Evening Star 9200 2.8 .0 * 61.7 44.2 140
Marquette 8760 .5 -M * 33.0 -M *
Sylvan Road 7120 -M .0 * -M 28.0 *
Younts Peak 8350 1.3 .0 * 46.7 28.7 163
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Basin Index (%) * 154
POWDER RIVER
Bear Trap Meadow 8200 .0 .0 * 22.5 20.2 111
Cloud Peak Reservoir 9860 .0 .0 * 36.3 29.7 122
Grave Springs 8550 .0 .0 * 18.2 22.5 81
Hansen Sawmill 8360 .0 .0 * 30.5 21.5 142
Middle Powder 7760 .0 .0 * 18.7 24.3 77
Powder River Pass 9480 .2 .0 * 29.6 26.1 113
Soldier Park 8720 .0 -M * 30.5 -M *
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Basin Index (%) * 108
TONGUE RIVER
Big Goose 7990 .0 .0 * 26.4 24.1 110
Bone Springs Div 9350 .0 .0 * 34.4 30.6 112
Burgess Junction 7880 .0 .0 * 27.7 24.9 111
Dome Lake 8880 .0 .0 * 32.1 27.6 116
Little Goose 8870 .0 -M * 32.9 -M *
Sucker Creek 8880 .0 .0 * 32.0 29.2 110
Tie Creek 6870 .0 .0 * 31.9 26.1 122
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Basin Index (%) * 114
BELLE FOURCHE
Cole Canyon 5910 .0 .0 * 24.1 24.9 97
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Basin Index (%) * 97
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 24.8 27.2 91
North Rapid Creek 6130 .0 .0 * 24.3 26.7 91
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Basin Index (%) * 91
UPPER N. PLATTE
Arapaho Ridge 10960 -M .0 * -M 37.9 *
Blackhall Mtn 9820 .8 -M * 50.0 -M *
Columbine 9160 .4 .0 * 39.4 37.6 105
Divide Peak 8880 .0 .0 * 30.7 33.2 92
Joe Wright 10120 .4 .0 * 44.1 43.4 102
Laprele Creek 8375 .0 .0 * 23.4 23.7 99
Med Bow 10500 .2 -M * 53.1 -M *
North French Creek 10130 -M .0 * 43.0 42.6 101
Never Summer 10280 -M .0 * 30.9 -M *
Old Battle 10000 .3 .0 * 52.3 51.0 103
Rawah 9020 .1 .0 * 27.2 26.6 102
Sage Creek Basin 7850 -M .0 * 22.5 22.6 100
Sand Lake 10050 .2 .0 * 42.6 40.3 106
South Brush Creek 8440 .1 .0 * 20.7 27.0 77
Tower 10500 -M .0 * -M 57.6 *
Webber Springs 9250 .6 .0 * 45.0 39.7 113
Willow Creek Pass 9540 .1 .0 * 27.7 25.5 109
Zirkel 9340 .0 .0 * 56.4 42.8 132
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Basin Index (%) * 104
SWEETWATER
Deer Park 9700 .0 .0 * 52.7 34.3 154
Larsen Creek 9000 .1 .0 * 33.8 -M *
South Pass 9040 .0 .0 * 42.5 29.0 147
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Basin Index (%) * 150
LOWER N. PLATTE
Casper Mtn. 7900 .2 .0 * 27.8 27.4 101
Laprele Creek 8375 .0 .0 * 23.4 23.7 99
Reno Hill 8400 .0 .0 * 26.4 28.1 94
Windy Peak 7900 .0 .0 * 22.5 22.4 100
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Basin Index (%) * 99
LARAMIE RIVER
Brooklyn Lake 10240 .0 .0 * 33.3 34.8 96
Cinnabar Park 9574 .0 .0 * 35.2 37.5 94
Crow Creek 8330 -M .0 * 20.2 25.4 80
Deadman Hill 10220 .1 .0 * 34.9 30.5 114
Rawah 9020 .1 .0 * 27.2 26.6 102
Roach 9700 .0 .0 * 34.6 32.8 105
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Basin Index (%) * 99
S. PLATTE
Black Mountain 8920 .0 -M * 26.1 -M *
Crow Creek 8330 -M .0 * 20.2 25.4 80
Deadman Hill 10220 .1 .0 * 34.9 30.5 114
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Basin Index (%) * 99
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 22.8 23.8 96
Divide Peak 8880 .0 .0 * 30.7 33.2 92
Elk River 8700 .1 .0 * 29.8 31.9 93
Little Snake River 8915 .1 .0 * 53.6 42.9 125
Old Battle 10000 .3 .0 * 52.3 51.0 103
Sage Creek Basin 7850 -M .0 * 22.5 22.6 100
Sandstone RS 8150 .2 .0 * 23.5 28.8 82
Whiskey Park 8950 .1 .0 * 41.4 41.2 100
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Basin Index (%) * 100
UPPER GREEN RIVER
Big Sandy Opening 9080 .1 .0 * 32.6 23.6 138
Blind Bull Sum 8650 .9 .0 * 46.7 30.3 154
East Rim Divide 7930 .2 .0 * 29.6 19.6 151
Elkhart Park G.S. 9400 .2 .0 * 34.1 24.1 141
Gros Ventre Summit 8750 .2 .0 * 35.2 23.0 153
Gunsight Pass 9820 1.3 .0 * -M 25.3 *
Kendall R.S. 7740 .2 .0 * 39.8 22.5 177
Loomis Park 8240 .2 .0 * 43.4 27.2 160
New Fork Lake 8340 .1 .0 * -M 19.8 *
Pocket Creek 9360 .1 -M * 32.6 -M *
Snider Basin 8060 .0 .0 * 33.3 21.5 155
Spring Creek Divide 9000 .4 .0 * 51.5 35.2 146
Triple Peak 8500 .1 .0 * 52.8 37.6 140
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Basin Index (%) * 151
LOWER GREEN RIVER
Blacks Fork Jct 8869 .0 -M * 24.5 -M *
Buck Pasture 9632 .0 -M * 35.6 -M *
EF Blacks Fork GS 9360 .0 -M * 30.8 -M *
Hams Fork 7840 -M .0 * -M 19.4 *
Hewinta 9500 .0 .0 * 28.5 25.5 112
Hickerson Park 9122 .4 .0 * 23.1 21.3 108
Hole-in-Rock 9168 .0 .0 * 25.0 20.8 120
Indian Creek 9425 .1 .0 * 51.6 33.2 155
Kelley R.S. 8180 .2 .0 * 41.8 27.5 152
Spirit Lk 10235 .0 -M * 31.2 -M *
Steel Creek Park 10158 .1 .0 * 34.5 29.4 117
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Basin Index (%) * 130
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 26.6 -M *
Bug Lake 7987 .9 .0 * 44.2 29.2 151
Burts Miller Ranch 8000 .4 -M * 15.1 -M *
Chalk Creek #1 9171 .4 .0 * 50.5 39.6 128
Hayden Fork 9130 .1 .0 * 40.5 33.7 120
Kelley R.S. 8180 .2 .0 * 41.8 27.5 152
Lily Lake 9133 .0 .0 * 30.7 28.8 107
Monte Cristo 8932 .4 .0 * 52.8 38.6 137
Salt River Summit 7760 .1 .0 * 36.0 26.2 137
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Basin Index (%) * 133
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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.
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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.
