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 MONDAY: MAY 1 , 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 20.6 9.3 222 42.1 22.8 185
Black Bear 8170 51.4 37.4 137 59.8 41.7 143
Blind Bull Sum 8650 -M 23.1 * 38.9 21.3 183
Cottonwood Creek 7670 30.0 15.3 196 43.6 27.5 159
East Rim Divide 7930 10.9 8.2 133 22.5 12.9 174
Grand Targhee 9260 57.8 44.8 129 51.0 34.6 147
Granite Creek 6770 22.0 8.3 265 38.2 21.3 179
Grassy Lake 7265 39.6 29.1 136 61.4 39.3 156
Gros Ventre Summit 8750 21.2 11.6 183 26.4 14.6 181
Gunsight Pass 9820 -M 12.5 * 28.2 16.0 176
Lewis Lake Divide 7850 48.7 30.1 162 59.7 38.5 155
Phillips Bench 8200 41.9 25.4 165 50.6 30.7 165
Salt River Summit 7760 18.1 7.9 229 -M 18.4 *
Snake River Station 6920 14.3 7.4 193 39.3 24.7 159
Spring Creek Divide 9000 44.5 24.3 183 44.3 26.2 169
Thumb Divide 7980 20.6 12.4 166 30.6 20.9 146
Togwotee Pass 9580 37.0 24.7 150 42.9 27.2 158
Two Ocean Plateau 9240 -M 29.7 * -M 30.1 *
Willow Creek 8380 29.3 23.0 127 57.3 37.5 153
Younts Peak 8350 23.5 15.5 152 33.8 17.6 192
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Basin Index (%) 159 162
MADISON-GALLATIN
Black Bear 8170 51.4 37.4 137 59.8 41.7 143
Canyon 7870 18.7 10.4 180 28.8 18.0 160
Madison Plateau 7750 29.8 21.3 140 40.0 28.9 138
West Yellowstone 6700 .0 1.8 0 26.0 16.0 162
Whiskey Creek 6800 12.8 14.6 88 29.7 22.3 133
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Basin Index (%) 132 145
YELLOWSTONE
Beartooth Lake 9360 36.1 22.8 158 31.0 21.9 142
Burnt Mtn 5880 .4 .0 * 18.4 15.9 116
Canyon 7870 18.7 10.4 180 28.8 18.0 160
Cole Creek 7850 17.1 16.6 103 14.2 16.4 87
Evening Star 9200 41.7 24.9 167 48.8 30.4 161
Fisher Creek 9100 47.6 32.7 146 51.8 35.1 148
Northeast Entrance 7350 2.9 3.0 97 23.0 13.8 167
Parker Peak 9400 42.6 21.3 200 39.8 20.0 199
Sylvan Lake 8420 27.1 19.8 137 41.9 25.1 167
Thumb Divide 7980 20.6 12.4 166 30.6 20.9 146
Two Ocean Plateau 9240 -M 29.7 * -M 30.1 *
White Mill 8700 40.4 23.8 170 39.4 26.3 150
Wolverine 7650 2.9 2.5 116 23.6 13.7 172
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Basin Index (%) 157 152
WIND RIVER
Burroughs Creek 8750 20.3 -M * 29.2 -M *
Castle Creek 8400 7.5 -M * 17.3 -M *
Cold Springs 9630 16.1 1.3 1238 22.3 12.4 180
Deer Park 9700 37.2 16.0 232 43.1 23.4 184
Hobbs Park 10100 35.0 16.0 219 32.4 16.6 195
Kirwin 9550 26.2 10.4 252 29.1 13.8 211
Little Warm 9370 19.2 8.7 221 26.9 15.3 176
Owl Creek 8975 9.0 1.0 900 15.3 7.9 194
South Pass 9040 34.5 14.9 232 33.6 20.3 166
St. Lawrence Alt 8620 9.6 2.5 384 20.5 11.5 178
Togwotee Pass 9580 37.0 24.7 150 42.9 27.2 158
Townsend Creek 8700 19.9 7.5 265 28.1 14.9 189
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Basin Index (%) 237 180
BIGHORN BASIN
Bald Mtn. 9380 24.1 20.5 118 20.8 19.7 106
Bear Trap Meadow 8200 7.0 .9 778 14.6 10.6 138
Bone Springs Div 9350 23.4 16.5 142 21.2 18.2 116
Grave Springs 8550 11.2 9.4 119 13.5 12.8 105
Kirwin 9550 26.2 10.4 252 29.1 13.8 211
Marquette 8760 20.4 -M * 23.6 -M *
Middle Powder 7760 13.0 11.6 112 13.8 14.1 98
Owl Creek 8975 9.0 1.0 900 15.3 7.9 194
Powder River Pass 9480 11.7 9.4 124 17.9 15.1 119
Shell Creek 9580 20.2 15.9 127 18.0 16.3 110
Timber Creek 7950 8.1 3.1 261 15.1 9.9 153
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Basin Index (%) 156 130
SHOSHONE RIVER
Blackwater 9780 42.0 25.3 166 46.2 23.4 197
Evening Star 9200 41.7 24.9 167 48.8 30.4 161
Marquette 8760 20.4 -M * 23.6 -M *
Sylvan Road 7120 .0 5.8 0 32.5 18.6 175
Younts Peak 8350 23.5 15.5 152 33.8 17.6 192
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Basin Index (%) 150 179
POWDER RIVER
Bear Trap Meadow 8200 7.0 .9 778 14.6 10.6 138
Cloud Peak Reservoir 9860 21.8 16.5 132 26.0 16.6 157
Grave Springs 8550 11.2 9.4 119 13.5 12.8 105
Hansen Sawmill 8360 15.8 2.5 632 18.9 10.8 175
Middle Powder 7760 13.0 11.6 112 13.8 14.1 98
Powder River Pass 9480 11.7 9.4 124 17.9 15.1 119
Soldier Park 8720 18.1 -M * 20.3 -M *
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Basin Index (%) 160 131
TONGUE RIVER
Big Goose 7990 15.1 9.2 164 19.5 14.0 139
Bone Springs Div 9350 23.4 16.5 142 21.2 18.2 116
Burgess Junction 7880 13.2 12.1 109 15.8 14.8 107
Dome Lake 8880 19.6 11.4 172 21.6 16.4 132
Little Goose 8870 19.0 -M * 23.7 -M *
Sucker Creek 8880 16.3 12.2 134 18.6 17.3 108
Tie Creek 6870 4.4 2.7 163 19.3 14.3 135
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Basin Index (%) 144 122
BELLE FOURCHE
Cole Canyon 5910 1.6 .3 533* 11.7 11.8 99
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Basin Index (%) 533* 99
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .8 0 10.8 14.3 76
North Rapid Creek 6130 .0 .8 0 9.6 12.2 79
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Basin Index (%) 0 77
UPPER N. PLATTE
Arapaho Ridge 10960 26.6 22.3 119 29.6 26.2 113
Blackhall Mtn 9820 36.9 -M * 41.7 -M *
Columbine 9160 12.9 18.2 71 31.7 28.5 111
Divide Peak 8880 12.3 18.0 68 25.9 24.3 107
Joe Wright 10120 19.2 23.3 82 32.9 29.8 110
Laprele Creek 8375 6.5 6.1 107 14.8 15.0 99
Med Bow 10500 39.6 -M * 40.2 -M *
North French Creek 10130 27.8 32.9 84 32.9 30.7 107
Never Summer 10280 25.0 21.8 115 22.5 -M *
Old Battle 10000 40.2 34.7 116 42.7 39.2 109
Rawah 9020 5.8 6.1 95 20.3 17.2 118
Sage Creek Basin 7850 -M 1.1 * 17.9 16.1 111
Sand Lake 10050 32.7 31.4 104 31.5 29.0 109
South Brush Creek 8440 .2 9.2 2 15.3 17.8 86
Tower 10500 44.4 50.0 89 50.1 44.7 112
Webber Springs 9250 23.1 21.7 106 36.8 29.9 123
Willow Creek Pass 9540 19.2 14.2 135 20.4 15.8 129
Zirkel 9340 24.7 21.0 118 46.4 31.0 150
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Basin Index (%) 97 114
SWEETWATER
Deer Park 9700 37.2 16.0 232 43.1 23.4 184
Larsen Creek 9000 13.4 9.2 146 26.0 -M *
South Pass 9040 34.5 14.9 232 33.6 20.3 166
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Basin Index (%) 212 176
LOWER N. PLATTE
Casper Mtn. 7900 12.9 13.3 97 18.4 17.9 103
Laprele Creek 8375 6.5 6.1 107 14.8 15.0 99
Reno Hill 8400 13.1 12.6 104 18.0 18.9 95
Windy Peak 7900 4.0 4.0 100 13.9 13.0 107
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Basin Index (%) 101 100
LARAMIE RIVER
Brooklyn Lake 10240 20.9 23.3 90 26.1 24.7 106
Cinnabar Park 9574 14.2 19.4 73 26.3 26.9 98
Crow Creek 8330 .0 .0 * 12.0 13.4 90
Deadman Hill 10220 22.2 19.0 117 24.4 20.6 118
Rawah 9020 5.8 6.1 95 20.3 17.2 118
Roach 9700 16.5 17.2 96 24.8 22.2 112
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Basin Index (%) 94 107
S. PLATTE
Black Mountain 8920 8.6 -M * 16.2 -M *
Crow Creek 8330 .0 .0 * 12.0 13.4 90
Deadman Hill 10220 22.2 19.0 117 24.4 20.6 118
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Basin Index (%) 117* 107
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 19.5 17.1 114
Divide Peak 8880 12.3 18.0 68 25.9 24.3 107
Elk River 8700 5.9 13.2 45 23.3 22.7 103
Little Snake River 8915 23.5 22.3 105 43.0 32.7 131
Old Battle 10000 40.2 34.7 116 42.7 39.2 109
Sage Creek Basin 7850 -M 1.1 * 17.9 16.1 111
Sandstone RS 8150 .0 5.9 0 18.6 20.8 89
Whiskey Park 8950 24.7 26.5 93 34.9 31.5 111
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Basin Index (%) 88 110
UPPER GREEN RIVER
Big Sandy Opening 9080 22.9 10.6 216 25.7 15.1 170
Blind Bull Sum 8650 -M 23.1 * 38.9 21.3 183
East Rim Divide 7930 10.9 8.2 133 22.5 12.9 174
Elkhart Park G.S. 9400 20.9 11.3 185 26.3 15.0 175
Gros Ventre Summit 8750 21.2 11.6 183 26.4 14.6 181
Gunsight Pass 9820 -M 12.5 * 28.2 16.0 176
Kendall R.S. 7740 15.1 4.3 351 30.7 15.5 198
Loomis Park 8240 24.6 11.0 224 34.3 18.9 181
New Fork Lake 8340 12.7 6.5 195 19.4 12.1 160
Pocket Creek 9360 -M -M * -M -M *
Snider Basin 8060 15.5 9.4 165 29.2 15.6 187
Spring Creek Divide 9000 44.5 24.3 183 44.3 26.2 169
Triple Peak 8500 36.9 17.5 211 44.5 27.9 159
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Basin Index (%) 196 175
LOWER GREEN RIVER
Blacks Fork Jct 8869 5.6 -M * 18.7 -M *
Buck Pasture 9632 16.8 -M * 27.3 -M *
EF Blacks Fork GS 9360 13.2 -M * 21.4 -M *
Hams Fork 7840 10.2 2.9 352 23.8 13.1 182
Hewinta 9500 8.3 4.8 173 20.9 16.1 130
Hickerson Park 9122 4.7 4.2 112 15.1 12.0 126
Hole-in-Rock 9168 5.7 2.5 228 15.7 11.4 138
Indian Creek 9425 44.4 23.0 193 45.0 25.0 180
Kelley R.S. 8180 24.4 11.5 212 33.7 20.2 167
Spirit Lk 10235 15.9 -M * 20.9 -M *
Steel Creek Park 10158 22.6 17.1 132 25.2 19.1 132
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Basin Index (%) 182 153
UPPER BEAR RIVER
Bear River RS 8777 1.7 -M * 21.4 -M *
Bug Lake 7987 33.6 15.1 223 37.7 21.7 174
Burts Miller Ranch 8000 .0 -M * 11.9 -M *
Chalk Creek #1 9171 34.5 24.2 143 41.0 28.4 144
Hayden Fork 9130 15.7 9.3 169 33.7 23.8 142
Kelley R.S. 8180 24.4 11.5 212 33.7 20.2 167
Lily Lake 9133 13.2 9.9 133 23.0 19.5 118
Monte Cristo 8932 38.7 26.5 146 44.5 29.2 152
Salt River Summit 7760 18.1 7.9 229 -M 18.4 *
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Basin Index (%) 171 150
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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.