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: MAY 20 , 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 8.1 .0 * 43.1 24.5 176
Black Bear 8170 45.5 33.8 135 61.6 44.6 138
Blind Bull Sum 8650 -M 19.9 * 39.6 23.2 171
Cottonwood Creek 7670 18.8 6.3 298 44.9 30.0 150
East Rim Divide 7930 .1 .5 20* 23.4 14.1 166
Grand Targhee 9260 54.9 42.3 130 52.7 36.8 143
Granite Creek 6770 7.2 .0 * 38.7 22.9 169
Grassy Lake 7265 25.4 17.4 146 62.5 41.8 150
Gros Ventre Summit 8750 -M 5.6 * -M 16.1 *
Gunsight Pass 9820 20.5 10.4 197 29.6 17.7 167
Lewis Lake Divide 7850 35.4 22.4 158 60.2 41.0 147
Phillips Bench 8200 31.9 19.2 166 51.4 32.8 157
Salt River Summit 7760 3.6 .0 * 32.6 19.9 164
Snake River Station 6920 .0 .0 * 39.6 26.5 149
Spring Creek Divide 9000 37.9 20.3 187 45.8 28.0 164
Thumb Divide 7980 4.4 1.4 314* 31.1 22.8 136
Togwotee Pass 9580 33.0 23.0 143 44.5 29.7 150
Two Ocean Plateau 9240 -M 28.3 * -M 32.8 *
Willow Creek 8380 -M 16.6 * 59.5 40.8 146
Younts Peak 8350 2.9 11.8 25 33.6 19.5 172
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Basin Index (%) 158 154
MADISON-GALLATIN
Black Bear 8170 45.5 33.8 135 61.6 44.6 138
Canyon 7870 8.5 2.2 386 29.7 19.9 149
Madison Plateau 7750 19.3 14.3 135 41.3 31.5 131
West Yellowstone 6700 .0 .0 * 26.7 17.5 153
Whiskey Creek 6800 4.4 5.6 79 30.5 24.3 126
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Basin Index (%) 139 138
YELLOWSTONE
Beartooth Lake 9360 33.9 21.6 157 32.7 24.1 136
Burnt Mtn 5880 2.6 .0 * 23.1 19.1 121
Canyon 7870 8.5 2.2 386 29.7 19.9 149
Cole Creek 7850 16.1 16.2 99 19.2 19.5 98
Evening Star 9200 35.4 23.7 149 50.8 33.3 153
Fisher Creek 9100 49.8 32.8 152 53.5 38.3 140
Northeast Entrance 7350 .0 .0 * 23.7 15.5 153
Parker Peak 9400 35.4 19.8 179 41.4 22.4 185
Sylvan Lake 8420 16.7 15.1 111 43.4 27.6 157
Thumb Divide 7980 4.4 1.4 314* 31.1 22.8 136
Two Ocean Plateau 9240 -M 28.3 * -M 32.8 *
White Mill 8700 33.6 22.3 151 40.6 28.9 140
Wolverine 7650 -M .0 * 24.7 15.5 159
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Basin Index (%) 152 144
WIND RIVER
Burroughs Creek 8750 8.7 -M * 29.5 -M *
Castle Creek 8400 .0 -M * 18.4 -M *
Cold Springs 9630 6.9 .0 * 24.3 14.4 169
Deer Park 9700 31.5 10.5 300 46.0 25.9 178
Hobbs Park 10100 31.7 13.1 242 36.7 19.3 190
Kirwin 9550 19.7 8.4 235 30.5 15.9 192
Little Warm 9370 11.9 2.7 441 28.0 17.4 161
Owl Creek 8975 .8 .0 * 16.7 9.6 174
South Pass 9040 29.7 6.8 437 35.7 22.5 159
St. Lawrence Alt 8620 1.7 .0 * 22.3 13.5 165
Togwotee Pass 9580 33.0 23.0 143 44.5 29.7 150
Townsend Creek 8700 13.3 .0 * 30.5 17.1 178
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Basin Index (%) 279 170
BIGHORN BASIN
Bald Mtn. 9380 20.6 19.2 107 22.7 22.1 103
Bear Trap Meadow 8200 .6 .0 * 16.7 12.6 133
Bone Springs Div 9350 18.3 14.3 128 22.7 20.8 109
Grave Springs 8550 5.1 2.6 196 15.1 15.0 101
Kirwin 9550 19.7 8.4 235 30.5 15.9 192
Marquette 8760 15.8 -M * 26.2 -M *
Middle Powder 7760 4.4 5.3 83 14.8 16.3 91
Owl Creek 8975 .8 .0 * 16.7 9.6 174
Powder River Pass 9480 3.8 5.4 70 18.7 17.3 108
Shell Creek 9580 14.1 15.3 92 19.1 18.5 103
Timber Creek 7950 2.3 .0 * 17.7 12.2 145
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Basin Index (%) 127 121
SHOSHONE RIVER
Blackwater 9780 39.9 24.3 164 48.1 26.0 185
Evening Star 9200 35.4 23.7 149 50.8 33.3 153
Marquette 8760 15.8 -M * 26.2 -M *
Sylvan Road 7120 .0 .0 * 33.3 20.3 164
Younts Peak 8350 2.9 11.8 25 33.6 19.5 172
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Basin Index (%) 131 167
POWDER RIVER
Bear Trap Meadow 8200 .6 .0 * 16.7 12.6 133
Cloud Peak Reservoir 9860 18.0 14.8 122 27.9 19.6 142
Grave Springs 8550 5.1 2.6 196 15.1 15.0 101
Hansen Sawmill 8360 7.3 .0 * 19.0 12.9 147
Middle Powder 7760 4.4 5.3 83 14.8 16.3 91
Powder River Pass 9480 3.8 5.4 70 18.7 17.3 108
Soldier Park 8720 8.6 -M * 22.2 -M *
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Basin Index (%) 140 120
TONGUE RIVER
Big Goose 7990 8.4 4.8 175 21.0 17.1 123
Bone Springs Div 9350 18.3 14.3 128 22.7 20.8 109
Burgess Junction 7880 6.4 8.1 79 16.7 17.0 98
Dome Lake 8880 13.8 6.2 223 24.1 19.0 127
Little Goose 8870 11.5 -M * 25.2 -M *
Sucker Creek 8880 10.5 8.6 122 20.6 20.2 102
Tie Creek 6870 2.6 .0 * 24.2 17.3 140
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Basin Index (%) 143 116
BELLE FOURCHE
Cole Canyon 5910 .0 .0 * 13.2 14.9 89
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Basin Index (%) * 89
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 13.9 16.6 84
North Rapid Creek 6130 .0 .0 * 12.1 14.5 83
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Basin Index (%) * 84
UPPER N. PLATTE
Arapaho Ridge 10960 21.1 18.1 117 31.9 28.5 112
Blackhall Mtn 9820 28.7 -M * 43.5 -M *
Columbine 9160 1.2 3.0 40 34.1 30.6 111
Divide Peak 8880 .9 5.7 16 27.4 26.5 103
Joe Wright 10120 14.9 21.1 71 36.0 32.8 110
Laprele Creek 8375 1.2 .0 * 17.0 16.9 101
Med Bow 10500 35.6 -M * 42.2 -M *
North French Creek 10130 21.8 29.6 74 35.4 33.7 105
Never Summer 10280 21.3 20.3 105 24.2 -M *
Old Battle 10000 36.9 32.5 114 44.4 42.1 105
Rawah 9020 .5 .4 125* 21.5 18.9 114
Sage Creek Basin 7850 .2 .0 * 18.9 17.4 109
Sand Lake 10050 30.7 27.8 110 33.9 31.9 106
South Brush Creek 8440 .0 .0 * 15.9 20.1 79
Tower 10500 40.2 47.7 84 54.1 47.9 113
Webber Springs 9250 11.7 12.0 98 38.7 32.1 121
Willow Creek Pass 9540 12.3 9.3 132 22.0 17.3 127
Zirkel 9340 11.1 9.7 114 49.1 33.4 147
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Basin Index (%) 95 112
SWEETWATER
Deer Park 9700 31.5 10.5 300 46.0 25.9 178
Larsen Creek 9000 .9 3.6 25 27.5 -M *
South Pass 9040 29.7 6.8 437 35.7 22.5 159
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Basin Index (%) 297 169
LOWER N. PLATTE
Casper Mtn. 7900 2.0 4.5 44 20.8 20.4 102
Laprele Creek 8375 1.2 .0 * 17.0 16.9 101
Reno Hill 8400 2.2 3.6 61 21.0 21.3 99
Windy Peak 7900 2.1 .0 * 17.7 14.9 119
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Basin Index (%) 93 104
LARAMIE RIVER
Brooklyn Lake 10240 12.7 16.4 77 28.4 27.2 104
Cinnabar Park 9574 6.6 12.3 54 28.9 29.5 98
Crow Creek 8330 -M .0 * 15.4 15.1 102
Deadman Hill 10220 16.2 16.5 98 28.1 23.0 122
Rawah 9020 .5 .4 125* 21.5 18.9 114
Roach 9700 9.3 11.5 81 27.7 24.7 112
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Basin Index (%) 79 108
S. PLATTE
Black Mountain 8920 2.7 -M * 20.0 -M *
Crow Creek 8330 -M .0 * 15.4 15.1 102
Deadman Hill 10220 16.2 16.5 98 28.1 23.0 122
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Basin Index (%) 98* 114
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 20.3 18.6 109
Divide Peak 8880 .9 5.7 16 27.4 26.5 103
Elk River 8700 .9 .0 * 24.5 24.6 100
Little Snake River 8915 12.1 13.3 91 44.7 35.2 127
Old Battle 10000 36.9 32.5 114 44.4 42.1 105
Sage Creek Basin 7850 .2 .0 * 18.9 17.4 109
Sandstone RS 8150 .0 .0 * 19.1 22.5 85
Whiskey Park 8950 18.0 21.9 82 36.9 33.9 109
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Basin Index (%) 94 107
UPPER GREEN RIVER
Big Sandy Opening 9080 13.4 3.1 432 27.0 16.8 161
Blind Bull Sum 8650 -M 19.9 * 39.6 23.2 171
East Rim Divide 7930 .1 .5 20* 23.4 14.1 166
Elkhart Park G.S. 9400 12.7 5.7 223 27.6 16.7 165
Gros Ventre Summit 8750 -M 5.6 * -M 16.1 *
Gunsight Pass 9820 20.5 10.4 197 29.6 17.7 167
Kendall R.S. 7740 .0 .0 * 31.8 16.8 189
Loomis Park 8240 13.6 2.6 523 35.4 20.5 173
New Fork Lake 8340 .0 .0 * 21.4 13.5 159
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 -M .4 * 29.5 16.8 176
Spring Creek Divide 9000 37.9 20.3 187 45.8 28.0 164
Triple Peak 8500 24.0 8.4 286 45.4 30.2 150
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Basin Index (%) 240* 166
LOWER GREEN RIVER
Blacks Fork Jct 8869 .0 -M * 19.7 -M *
Buck Pasture 9632 5.0 -M * 28.2 -M *
EF Blacks Fork GS 9360 -M -M * 23.6 -M *
Hams Fork 7840 .0 .0 * 24.7 14.4 172
Hewinta 9500 .0 .0 * 21.7 17.7 123
Hickerson Park 9122 .8 .0 * 16.0 13.4 119
Hole-in-Rock 9168 .0 .0 * 16.7 13.0 128
Indian Creek 9425 35.7 18.5 193 46.6 27.0 173
Kelley R.S. 8180 7.9 2.8 282 35.2 21.8 161
Spirit Lk 10235 4.3 -M * 22.2 -M *
Steel Creek Park 10158 16.1 14.7 110 26.2 21.0 125
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Basin Index (%) 168* 146
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 21.9 -M *
Bug Lake 7987 20.6 4.9 420 38.8 23.5 165
Burts Miller Ranch 8000 .0 -M * 12.1 -M *
Chalk Creek #1 9171 24.0 15.6 154 42.1 30.8 137
Hayden Fork 9130 .2 .0 * 33.1 25.8 128
Kelley R.S. 8180 7.9 2.8 282 35.2 21.8 161
Lily Lake 9133 .0 .0 * 23.5 21.3 110
Monte Cristo 8932 28.3 14.9 190 46.3 31.6 147
Salt River Summit 7760 3.6 .0 * 32.6 19.9 164
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Basin Index (%) 221* 144
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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.