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 TUESDAY: MAY 2 , 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 20.3 8.9 228 42.2 22.9 184
Black Bear 8170 50.8 37.4 136 59.8 41.8 143
Blind Bull Sum 8650 48.3 23.0 210 38.9 21.4 182
Cottonwood Creek 7670 29.3 15.0 195 43.8 27.6 159
East Rim Divide 7930 10.4 8.2 127 22.4 13.0 172
Grand Targhee 9260 57.7 45.1 128 51.0 34.8 147
Granite Creek 6770 21.3 8.1 263 38.2 21.4 179
Grassy Lake 7265 39.8 28.7 139 61.5 39.4 156
Gros Ventre Summit 8750 20.9 11.5 182 26.5 14.7 180
Gunsight Pass 9820 26.1 12.3 212 28.2 16.1 175
Lewis Lake Divide 7850 48.7 29.9 163 59.6 38.7 154
Phillips Bench 8200 42.0 25.1 167 50.6 30.7 165
Salt River Summit 7760 17.8 7.8 228 31.9 18.4 173
Snake River Station 6920 13.7 6.8 201 39.4 24.8 159
Spring Creek Divide 9000 44.6 24.3 184 44.3 26.3 168
Thumb Divide 7980 20.2 11.9 170 30.5 21.0 145
Togwotee Pass 9580 37.0 24.8 149 43.0 27.4 157
Two Ocean Plateau 9240 -M 29.8 * -M 30.2 *
Willow Creek 8380 28.9 22.6 128 57.4 37.7 152
Younts Peak 8350 23.1 15.6 148 33.8 17.7 191
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Basin Index (%) 164 162
MADISON-GALLATIN
Black Bear 8170 50.8 37.4 136 59.8 41.8 143
Canyon 7870 18.5 10.0 185 28.8 18.1 159
Madison Plateau 7750 29.6 21.2 140 40.0 29.0 138
West Yellowstone 6700 .0 1.2 0 26.0 16.0 162
Whiskey Creek 6800 12.6 14.2 89 29.8 22.4 133
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Basin Index (%) 133 145
YELLOWSTONE
Beartooth Lake 9360 36.3 22.7 160 31.1 22.0 141
Burnt Mtn 5880 .1 .0 * 18.5 16.0 116
Canyon 7870 18.5 10.0 185 28.8 18.1 159
Cole Creek 7850 17.1 16.6 103 14.1 16.5 85
Evening Star 9200 42.0 24.8 169 49.0 30.5 161
Fisher Creek 9100 48.0 32.6 147 52.1 35.2 148
Northeast Entrance 7350 2.6 2.4 108 23.1 13.8 167
Parker Peak 9400 42.9 21.2 202 40.0 20.1 199
Sylvan Lake 8420 27.0 19.5 138 42.0 25.1 167
Thumb Divide 7980 20.2 11.9 170 30.5 21.0 145
Two Ocean Plateau 9240 -M 29.8 * -M 30.2 *
White Mill 8700 40.7 23.8 171 39.6 26.4 150
Wolverine 7650 2.8 1.9 147 23.7 13.8 172
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Basin Index (%) 159 152
WIND RIVER
Burroughs Creek 8750 20.1 -M * 29.2 -M *
Castle Creek 8400 7.0 -M * 17.5 -M *
Cold Springs 9630 16.0 1.2 1333 22.3 12.5 178
Deer Park 9700 37.1 15.8 235 43.4 23.5 185
Hobbs Park 10100 35.0 16.0 219 34.5 16.8 205
Kirwin 9550 26.1 10.5 249 29.1 13.9 209
Little Warm 9370 19.3 8.6 224 27.2 15.4 177
Owl Creek 8975 8.8 .8 1100 15.3 8.0 191
South Pass 9040 34.3 14.7 233 33.6 20.5 164
St. Lawrence Alt 8620 9.7 2.1 462 20.6 11.6 178
Togwotee Pass 9580 37.0 24.8 149 43.0 27.4 157
Townsend Creek 8700 19.8 7.3 271 28.1 15.0 187
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Basin Index (%) 239 180
BIGHORN BASIN
Bald Mtn. 9380 24.3 20.5 119 20.9 19.8 106
Bear Trap Meadow 8200 7.2 .7 1029 14.7 10.7 137
Bone Springs Div 9350 23.4 16.5 142 21.2 18.3 116
Grave Springs 8550 11.4 9.5 120 13.5 13.0 104
Kirwin 9550 26.1 10.5 249 29.1 13.9 209
Marquette 8760 20.4 -M * 23.6 -M *
Middle Powder 7760 13.7 11.5 119 14.0 14.2 99
Owl Creek 8975 8.8 .8 1100 15.3 8.0 191
Powder River Pass 9480 11.8 9.2 128 17.9 15.1 119
Shell Creek 9580 20.4 15.9 128 18.0 16.4 110
Timber Creek 7950 7.9 3.0 263 15.1 10.1 150
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Basin Index (%) 158 129
SHOSHONE RIVER
Blackwater 9780 42.1 25.5 165 46.3 23.6 196
Evening Star 9200 42.0 24.8 169 49.0 30.5 161
Marquette 8760 20.4 -M * 23.6 -M *
Sylvan Road 7120 .0 5.2 0 32.4 18.6 174
Younts Peak 8350 23.1 15.6 148 33.8 17.7 191
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Basin Index (%) 151 179
POWDER RIVER
Bear Trap Meadow 8200 7.2 .7 1029 14.7 10.7 137
Cloud Peak Reservoir 9860 22.0 16.4 134 26.1 16.7 156
Grave Springs 8550 11.4 9.5 120 13.5 13.0 104
Hansen Sawmill 8360 15.7 2.1 748 18.9 11.0 172
Middle Powder 7760 13.7 11.5 119 14.0 14.2 99
Powder River Pass 9480 11.8 9.2 128 17.9 15.1 119
Soldier Park 8720 18.1 -M * 20.3 -M *
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Basin Index (%) 166 130
TONGUE RIVER
Big Goose 7990 15.1 9.2 164 19.5 14.2 137
Bone Springs Div 9350 23.4 16.5 142 21.2 18.3 116
Burgess Junction 7880 13.4 12.0 112 15.8 14.9 106
Dome Lake 8880 19.6 11.4 172 21.7 16.6 131
Little Goose 8870 19.0 -M * 23.8 -M *
Sucker Creek 8880 16.4 12.0 137 18.7 17.5 107
Tie Creek 6870 4.5 2.6 173 19.4 14.5 134
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Basin Index (%) 145 121
BELLE FOURCHE
Cole Canyon 5910 1.4 .4 350* 11.7 12.1 97
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Basin Index (%) 350* 97
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .3 0* 11.2 14.5 77
North Rapid Creek 6130 .0 .7 0 9.7 12.4 78
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Basin Index (%) 0 78
UPPER N. PLATTE
Arapaho Ridge 10960 26.7 22.3 120 29.7 26.3 113
Blackhall Mtn 9820 36.9 -M * 41.5 -M *
Columbine 9160 12.9 17.8 72 31.7 28.7 110
Divide Peak 8880 12.2 18.0 68 25.9 24.4 106
Joe Wright 10120 19.2 23.1 83 33.0 30.0 110
Laprele Creek 8375 6.4 5.8 110 14.8 15.1 98
Med Bow 10500 40.1 -M * 40.5 -M *
North French Creek 10130 28.2 32.8 86 33.3 30.8 108
Never Summer 10280 25.1 21.8 115 22.6 -M *
Old Battle 10000 40.2 34.7 116 42.7 39.3 109
Rawah 9020 5.7 5.6 102 20.4 17.3 118
Sage Creek Basin 7850 -M 1.1 * 17.8 16.2 110
Sand Lake 10050 32.9 31.4 105 31.6 29.2 108
South Brush Creek 8440 .2 8.8 2 15.4 17.9 86
Tower 10500 44.4 50.2 88 50.4 44.9 112
Webber Springs 9250 23.0 21.5 107 36.9 30.1 123
Willow Creek Pass 9540 19.3 14.3 135 20.5 15.8 130
Zirkel 9340 24.7 20.9 118 46.5 31.1 150
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Basin Index (%) 98 113
SWEETWATER
Deer Park 9700 37.1 15.8 235 43.4 23.5 185
Larsen Creek 9000 13.1 8.9 147 26.0 -M *
South Pass 9040 34.3 14.7 233 33.6 20.5 164
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Basin Index (%) 214 175
LOWER N. PLATTE
Casper Mtn. 7900 13.0 13.0 100 18.5 18.1 102
Laprele Creek 8375 6.4 5.8 110 14.8 15.1 98
Reno Hill 8400 13.3 12.4 107 18.1 19.0 95
Windy Peak 7900 4.0 3.7 108 13.9 13.0 107
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Basin Index (%) 105 100
LARAMIE RIVER
Brooklyn Lake 10240 21.1 23.3 91 26.2 24.8 106
Cinnabar Park 9574 14.3 19.2 74 26.4 27.0 98
Crow Creek 8330 .0 .0 * 12.1 13.5 90
Deadman Hill 10220 22.3 19.1 117 24.5 20.8 118
Rawah 9020 5.7 5.6 102 20.4 17.3 118
Roach 9700 16.7 17.1 98 25.0 22.4 112
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Basin Index (%) 95 107
S. PLATTE
Black Mountain 8920 8.4 -M * 16.3 -M *
Crow Creek 8330 .0 .0 * 12.1 13.5 90
Deadman Hill 10220 22.3 19.1 117 24.5 20.8 118
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Basin Index (%) 117* 107
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 19.5 17.2 113
Divide Peak 8880 12.2 18.0 68 25.9 24.4 106
Elk River 8700 5.8 12.9 45 23.3 22.8 102
Little Snake River 8915 23.5 22.1 106 43.1 32.9 131
Old Battle 10000 40.2 34.7 116 42.7 39.3 109
Sage Creek Basin 7850 -M 1.1 * 17.8 16.2 110
Sandstone RS 8150 -M 5.6 * 18.7 20.8 90
Whiskey Park 8950 24.7 26.6 93 34.9 31.6 110
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Basin Index (%) 93 110
UPPER GREEN RIVER
Big Sandy Opening 9080 22.6 10.2 222 25.7 15.2 169
Blind Bull Sum 8650 48.3 23.0 210 38.9 21.4 182
East Rim Divide 7930 10.4 8.2 127 22.4 13.0 172
Elkhart Park G.S. 9400 20.8 11.1 187 26.3 15.1 174
Gros Ventre Summit 8750 20.9 11.5 182 26.5 14.7 180
Gunsight Pass 9820 26.1 12.3 212 28.2 16.1 175
Kendall R.S. 7740 14.3 3.8 376 30.7 15.6 197
Loomis Park 8240 24.2 10.8 224 34.3 19.0 181
New Fork Lake 8340 12.3 6.3 195 19.5 12.2 160
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 14.7 9.1 162 29.2 15.7 186
Spring Creek Divide 9000 44.6 24.3 184 44.3 26.3 168
Triple Peak 8500 36.5 17.1 213 44.6 28.0 159
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Basin Index (%) 200 175
LOWER GREEN RIVER
Blacks Fork Jct 8869 5.3 -M * 18.7 -M *
Buck Pasture 9632 16.6 -M * 27.3 -M *
EF Blacks Fork GS 9360 13.0 -M * 21.4 -M *
Hams Fork 7840 9.7 2.5 388 23.8 13.2 180
Hewinta 9500 7.8 4.6 170 20.9 16.3 128
Hickerson Park 9122 4.1 3.9 105 15.0 12.1 124
Hole-in-Rock 9168 5.0 2.2 227 15.7 11.6 135
Indian Creek 9425 44.5 22.8 195 45.0 25.1 179
Kelley R.S. 8180 24.4 11.2 218 33.7 20.2 167
Spirit Lk 10235 15.9 -M * 20.8 -M *
Steel Creek Park 10158 22.5 17.2 131 25.2 19.2 131
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Basin Index (%) 183 152
UPPER BEAR RIVER
Bear River RS 8777 1.1 -M * 21.4 -M *
Bug Lake 7987 33.4 14.7 227 37.6 21.8 172
Burts Miller Ranch 8000 .0 -M * 11.9 -M *
Chalk Creek #1 9171 34.4 24.0 143 41.0 28.6 143
Hayden Fork 9130 15.2 9.1 167 33.6 23.9 141
Kelley R.S. 8180 24.4 11.2 218 33.7 20.2 167
Lily Lake 9133 12.9 10.0 129 23.0 19.6 117
Monte Cristo 8932 39.1 26.2 149 44.5 29.3 152
Salt River Summit 7760 17.8 7.8 228 31.9 18.4 173
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Basin Index (%) 172 152
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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.