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 THURSDAY: MAY 11 , 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 12.5 3.9 321 42.3 23.7 178
Black Bear 8170 47.7 36.8 130 59.8 43.2 138
Blind Bull Sum 8650 -M 22.4 * 39.2 22.3 176
Cottonwood Creek 7670 22.8 12.5 182 44.1 29.0 152
East Rim Divide 7930 .1 5.7 2 23.1 13.6 170
Grand Targhee 9260 57.2 46.3 124 51.7 36.1 143
Granite Creek 6770 15.4 4.7 328 38.4 22.2 173
Grassy Lake 7265 30.4 25.3 120 61.5 40.7 151
Gros Ventre Summit 8750 16.9 9.5 178 26.7 15.5 172
Gunsight Pass 9820 22.9 12.2 188 28.6 17.1 167
Lewis Lake Divide 7850 41.0 29.0 141 59.7 39.9 150
Phillips Bench 8200 36.0 23.0 157 50.8 32.0 159
Salt River Summit 7760 8.8 3.9 226 32.1 19.2 167
Snake River Station 6920 3.6 1.8 200 39.2 25.7 153
Spring Creek Divide 9000 42.3 23.5 180 44.9 27.2 165
Thumb Divide 7980 11.0 7.9 139 30.5 21.9 139
Togwotee Pass 9580 34.6 25.4 136 43.3 28.7 151
Two Ocean Plateau 9240 -M 29.5 * -M 31.7 *
Willow Creek 8380 -M 20.8 * 57.7 39.4 146
Younts Peak 8350 11.9 15.3 78 33.6 18.7 180
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Basin Index (%) 145 156
MADISON-GALLATIN
Black Bear 8170 47.7 36.8 130 59.8 43.2 138
Canyon 7870 12.6 7.1 177 28.9 19.0 152
Madison Plateau 7750 22.7 19.6 116 40.1 30.1 133
West Yellowstone 6700 .0 .0 * 26.0 16.7 156
Whiskey Creek 6800 7.5 10.3 73 29.9 23.2 129
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Basin Index (%) 123 140
YELLOWSTONE
Beartooth Lake 9360 34.0 23.0 148 31.8 23.2 137
Burnt Mtn 5880 .0 .0 * 18.6 17.8 104
Canyon 7870 12.6 7.1 177 28.9 19.0 152
Cole Creek 7850 14.1 17.2 82 14.3 18.3 78
Evening Star 9200 35.7 25.5 140 49.5 32.0 155
Fisher Creek 9100 48.4 34.4 141 52.8 36.8 143
Northeast Entrance 7350 .0 .8 0* 23.2 14.7 158
Parker Peak 9400 38.7 22.1 175 40.1 21.3 188
Sylvan Lake 8420 24.4 18.0 136 42.1 26.5 159
Thumb Divide 7980 11.0 7.9 139 30.5 21.9 139
Two Ocean Plateau 9240 -M 29.5 * -M 31.7 *
White Mill 8700 37.2 24.8 150 40.1 27.7 145
Wolverine 7650 -M .0 * 23.6 14.7 161
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Basin Index (%) 142 144
WIND RIVER
Burroughs Creek 8750 13.4 -M * 29.3 -M *
Castle Creek 8400 .0 -M * 17.7 -M *
Cold Springs 9630 10.2 1.2 850 22.4 13.5 166
Deer Park 9700 33.6 14.4 233 43.5 24.9 175
Hobbs Park 10100 32.8 15.8 208 34.7 18.0 193
Kirwin 9550 21.6 10.9 198 29.3 15.0 195
Little Warm 9370 15.1 6.6 229 27.5 16.4 168
Owl Creek 8975 1.2 .5 240* 15.6 8.8 177
South Pass 9040 30.3 11.4 266 33.9 21.5 158
St. Lawrence Alt 8620 2.3 .8 288 20.8 12.6 165
Togwotee Pass 9580 34.6 25.4 136 43.3 28.7 151
Townsend Creek 8700 15.8 3.4 465 28.3 16.0 177
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Basin Index (%) 218 171
BIGHORN BASIN
Bald Mtn. 9380 22.3 20.7 108 21.6 21.2 102
Bear Trap Meadow 8200 .6 .0 * 14.9 11.8 126
Bone Springs Div 9350 20.7 16.6 125 22.1 19.9 111
Grave Springs 8550 8.1 7.5 108 13.6 14.4 94
Kirwin 9550 21.6 10.9 198 29.3 15.0 195
Marquette 8760 16.7 -M * 23.9 -M *
Middle Powder 7760 8.9 10.5 85 14.4 15.5 93
Owl Creek 8975 1.2 .5 240* 15.6 8.8 177
Powder River Pass 9480 7.5 9.0 83 18.2 16.4 111
Shell Creek 9580 17.4 16.8 104 18.7 17.7 106
Timber Creek 7950 1.4 1.3 108 15.1 11.2 135
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Basin Index (%) 117 121
SHOSHONE RIVER
Blackwater 9780 40.5 24.6 165 46.7 24.7 189
Evening Star 9200 35.7 25.5 140 49.5 32.0 155
Marquette 8760 16.7 -M * 23.9 -M *
Sylvan Road 7120 .0 1.2 0 32.4 19.4 167
Younts Peak 8350 11.9 15.3 78 33.6 18.7 180
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Basin Index (%) 132 171
POWDER RIVER
Bear Trap Meadow 8200 .6 .0 * 14.9 11.8 126
Cloud Peak Reservoir 9860 19.4 16.8 115 26.5 18.4 144
Grave Springs 8550 8.1 7.5 108 13.6 14.4 94
Hansen Sawmill 8360 11.4 1.0 1140 18.8 12.0 157
Middle Powder 7760 8.9 10.5 85 14.4 15.5 93
Powder River Pass 9480 7.5 9.0 83 18.2 16.4 111
Soldier Park 8720 13.6 -M * 20.7 -M *
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Basin Index (%) 125 120
TONGUE RIVER
Big Goose 7990 12.0 10.3 117 20.2 16.0 126
Bone Springs Div 9350 20.7 16.6 125 22.1 19.9 111
Burgess Junction 7880 10.5 11.4 92 16.0 16.2 99
Dome Lake 8880 16.6 11.1 150 22.0 18.1 122
Little Goose 8870 15.3 -M * 24.2 -M *
Sucker Creek 8880 13.1 12.7 103 19.2 19.2 100
Tie Creek 6870 .1 1.2 8 20.0 16.2 123
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Basin Index (%) 115 113
BELLE FOURCHE
Cole Canyon 5910 .0 .0 * 12.1 13.8 88
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Basin Index (%) * 88
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 12.3 15.7 78
North Rapid Creek 6130 .0 .0 * 10.2 13.8 74
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Basin Index (%) * 76
UPPER N. PLATTE
Arapaho Ridge 10960 24.3 22.3 109 30.5 27.6 111
Blackhall Mtn 9820 34.2 -M * 42.2 -M *
Columbine 9160 6.3 11.9 53 32.5 29.7 109
Divide Peak 8880 5.1 13.7 37 26.2 25.6 102
Joe Wright 10120 17.2 23.2 74 34.0 31.5 108
Laprele Creek 8375 .2 2.0 10 15.7 16.2 97
Med Bow 10500 37.1 -M * 41.3 -M *
North French Creek 10130 25.4 32.7 78 34.2 32.5 105
Never Summer 10280 23.8 22.2 107 23.1 -M *
Old Battle 10000 37.7 36.9 102 43.3 40.9 106
Rawah 9020 .3 2.4 12 20.8 18.3 114
Sage Creek Basin 7850 -M .0 * 18.4 16.9 109
Sand Lake 10050 32.2 31.7 102 32.3 30.7 105
South Brush Creek 8440 .4 4.4 9 16.3 19.1 85
Tower 10500 42.9 51.2 84 51.7 46.6 111
Webber Springs 9250 17.9 19.0 94 37.5 31.2 120
Willow Creek Pass 9540 16.3 13.0 125 21.0 16.5 127
Zirkel 9340 18.1 19.3 94 47.4 32.8 145
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Basin Index (%) 88 111
SWEETWATER
Deer Park 9700 33.6 14.4 233 43.5 24.9 175
Larsen Creek 9000 4.3 6.2 69 26.2 -M *
South Pass 9040 30.3 11.4 266 33.9 21.5 158
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Basin Index (%) 213 167
LOWER N. PLATTE
Casper Mtn. 7900 6.8 11.1 61 19.4 19.6 99
Laprele Creek 8375 .2 2.0 10 15.7 16.2 97
Reno Hill 8400 6.9 10.0 69 19.7 20.4 97
Windy Peak 7900 .0 .0 * 15.2 13.9 109
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Basin Index (%) 60 100
LARAMIE RIVER
Brooklyn Lake 10240 17.7 21.1 84 26.9 26.1 103
Cinnabar Park 9574 10.8 17.0 64 27.0 28.4 95
Crow Creek 8330 .0 .0 * 12.5 14.4 87
Deadman Hill 10220 19.6 18.5 106 25.3 21.8 116
Rawah 9020 .3 2.4 12 20.8 18.3 114
Roach 9700 13.5 15.5 87 25.8 23.4 110
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Basin Index (%) 83 104
S. PLATTE
Black Mountain 8920 1.6 -M * 16.8 -M *
Crow Creek 8330 .0 .0 * 12.5 14.4 87
Deadman Hill 10220 19.6 18.5 106 25.3 21.8 116
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Basin Index (%) 106* 104
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 19.6 18.0 109
Divide Peak 8880 5.1 13.7 37 26.2 25.6 102
Elk River 8700 .1 7.0 1 23.3 23.8 98
Little Snake River 8915 18.5 20.1 92 43.7 34.4 127
Old Battle 10000 37.7 36.9 102 43.3 40.9 106
Sage Creek Basin 7850 -M .0 * 18.4 16.9 109
Sandstone RS 8150 -M 1.3 * 19.4 21.9 89
Whiskey Park 8950 23.1 26.5 87 35.4 33.0 107
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Basin Index (%) 81 107
UPPER GREEN RIVER
Big Sandy Opening 9080 16.8 8.6 195 25.8 16.2 159
Blind Bull Sum 8650 -M 22.4 * 39.2 22.3 176
East Rim Divide 7930 .1 5.7 2 23.1 13.6 170
Elkhart Park G.S. 9400 16.0 9.5 168 26.8 16.0 168
Gros Ventre Summit 8750 16.9 9.5 178 26.7 15.5 172
Gunsight Pass 9820 22.9 12.2 188 28.6 17.1 167
Kendall R.S. 7740 6.1 .0 * 31.3 16.2 193
Loomis Park 8240 17.6 7.0 251 35.2 19.9 177
New Fork Lake 8340 4.8 2.4 200 20.4 12.9 158
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 4.2 7.2 58 29.2 16.3 179
Spring Creek Divide 9000 42.3 23.5 180 44.9 27.2 165
Triple Peak 8500 29.3 14.5 202 44.9 29.2 154
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Basin Index (%) 177 169
LOWER GREEN RIVER
Blacks Fork Jct 8869 .0 -M * 19.1 -M *
Buck Pasture 9632 10.8 -M * 27.6 -M *
EF Blacks Fork GS 9360 5.1 -M * 22.8 -M *
Hams Fork 7840 .0 .2 0* 23.9 13.9 172
Hewinta 9500 .0 1.5 0 21.1 17.2 123
Hickerson Park 9122 .1 .0 * 14.9 12.9 116
Hole-in-Rock 9168 .0 .0 * 15.7 12.4 127
Indian Creek 9425 38.1 21.1 181 45.2 26.2 173
Kelley R.S. 8180 12.8 8.1 158 33.9 21.2 160
Spirit Lk 10235 9.6 -M * 21.0 -M *
Steel Creek Park 10158 18.8 17.6 107 25.5 20.3 126
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Basin Index (%) 144* 145
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 21.5 -M *
Bug Lake 7987 25.0 12.0 208 37.6 22.7 166
Burts Miller Ranch 8000 .0 -M * 11.9 -M *
Chalk Creek #1 9171 29.8 21.2 141 41.1 29.9 137
Hayden Fork 9130 4.5 5.4 83 32.8 25.0 131
Kelley R.S. 8180 12.8 8.1 158 33.9 21.2 160
Lily Lake 9133 4.8 4.5 107 23.0 20.7 111
Monte Cristo 8932 32.9 21.0 157 44.7 30.8 145
Salt River Summit 7760 8.8 3.9 226 32.1 19.2 167
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Basin Index (%) 156 145
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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.