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: DECEMBER 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 6.1 4.0 152 8.3 6.0 138
Black Bear 8170 12.5 9.0 139 12.0 10.6 113
Blind Bull Sum 8650 11.1 5.1 218 7.1 5.7 125
Cottonwood Creek 7670 4.5 4.4 102 6.4 6.9 93
East Rim Divide 7930 3.1 2.0 155 4.0 3.4 118
Grand Targhee 9260 19.6 9.9 198 11.9 9.8 121
Granite Creek 6770 4.5 2.6 173 7.7 5.4 143
Grassy Lake 7265 7.4 6.6 112 10.8 9.9 109
Gros Ventre Summit 8750 6.6 3.7 178 6.2 4.2 148
Gunsight Pass 9820 5.6 3.3 170 6.3 4.1 154
Lewis Lake Divide 7850 9.9 7.4 134 12.5 9.8 128
Phillips Bench 8200 7.1 5.6 127 8.9 7.4 120
Salt River Summit 7760 1.8 2.1 86 3.7 4.4 84
Snake River Station 6920 3.0 3.3 91 8.1 6.6 123
Spring Creek Divide 9000 6.8 5.2 131 7.5 6.5 115
Thumb Divide 7980 6.4 3.2 200 7.6 5.4 141
Togwotee Pass 9580 12.3 7.2 171 11.8 7.3 162
Two Ocean Plateau 9240 16.2 8.6 188 11.0 8.1 136
Willow Creek 8380 8.1 5.7 142 11.2 9.6 117
Younts Peak 8350 -M 4.3 * -M 5.0 *
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Basin Index (%) 154 124
MADISON-GALLATIN
Black Bear 8170 12.5 9.0 139 12.0 10.6 113
Canyon 7870 4.3 3.0 143 5.6 4.8 117
Madison Plateau 7750 7.5 5.1 147 8.4 7.2 117
West Yellowstone 6700 2.3 1.9 121 5.5 4.2 131
Whiskey Creek 6800 3.7 3.2 116 5.0 5.8 86
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Basin Index (%) 136 112
YELLOWSTONE
Beartooth Lake 9360 12.4 6.1 203 10.7 5.5 195
Burnt Mtn 5880 .2 1.3 15 5.3 5.1 104
Canyon 7870 4.3 3.0 143 5.6 4.8 117
Cole Creek 7850 4.6 4.1 112 3.6 5.0 72
Evening Star 9200 13.6 7.2 189 14.1 8.3 170
Fisher Creek 9100 16.3 8.8 185 13.6 9.1 149
Northeast Entrance 7350 2.1 1.7 124 5.7 4.1 139
Parker Peak 9400 12.4 6.1 203 10.0 5.6 179
Sylvan Lake 8420 9.0 5.2 173 9.4 7.2 131
Thumb Divide 7980 6.4 3.2 200 7.6 5.4 141
Two Ocean Plateau 9240 16.2 8.6 188 11.0 8.1 136
White Mill 8700 13.3 6.0 222 8.7 7.1 123
Wolverine 7650 3.0 2.0 150 6.7 4.1 163
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Basin Index (%) 180 141
WIND RIVER
Burroughs Creek 8750 5.1 -M * 6.4 -M *
Castle Creek 8400 2.5 -M * 4.1 -M *
Cold Springs 9630 3.1 2.5 124 3.7 3.7 100
Deer Park 9700 5.2 4.1 127 6.0 5.6 107
Hobbs Park 10100 7.9 4.5 176 6.4 4.5 142
Kirwin 9550 7.9 3.4 232 6.4 4.0 160
Little Warm 9370 7.3 2.9 252 6.9 4.2 164
Owl Creek 8975 1.4 1.6 88 3.0 2.2 136
South Pass 9040 4.3 3.9 110 3.6 5.3 68
St. Lawrence Alt 8620 1.6 2.1 76 3.9 3.2 122
Togwotee Pass 9580 12.3 7.2 171 11.8 7.3 162
Townsend Creek 8700 2.6 2.5 104 4.1 4.3 95
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Basin Index (%) 154 126
BIGHORN BASIN
Bald Mtn. 9380 6.5 5.8 112 4.1 5.2 79
Bear Trap Meadow 8200 2.5 1.4 179 3.8 3.2 119
Bone Springs Div 9350 4.7 5.1 92 3.9 4.9 80
Grave Springs 8550 1.5 1.9 79 1.8 3.7 49
Kirwin 9550 7.9 3.4 232 6.4 4.0 160
Marquette 8760 1.9 -M * 4.5 -M *
Middle Powder 7760 2.1 3.1 68 1.8 4.4 41
Owl Creek 8975 1.4 1.6 88 3.0 2.2 136
Powder River Pass 9480 5.6 2.9 193 4.8 4.1 117
Shell Creek 9580 7.7 5.0 154 4.8 4.6 104
Timber Creek 7950 .9 1.7 53 1.0 3.2 31
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Basin Index (%) 128 90
SHOSHONE RIVER
Blackwater 9780 13.9 7.1 196 11.4 6.6 173
Evening Star 9200 13.6 7.2 189 14.1 8.3 170
Marquette 8760 1.9 -M * 4.5 -M *
Sylvan Road 7120 3.8 2.8 136 7.6 5.9 129
Younts Peak 8350 -M 4.3 * -M 5.0 *
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Basin Index (%) 183 159
POWDER RIVER
Bear Trap Meadow 8200 2.5 1.4 179 3.8 3.2 119
Cloud Peak Reservoir 9860 3.9 3.8 103 4.9 4.8 102
Grave Springs 8550 1.5 1.9 79 1.8 3.7 49
Hansen Sawmill 8360 2.4 1.6 150 3.5 3.0 117
Middle Powder 7760 2.1 3.1 68 1.8 4.4 41
Powder River Pass 9480 5.6 2.9 193 4.8 4.1 117
Soldier Park 8720 1.2 -M * 3.5 -M *
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Basin Index (%) 122 89
TONGUE RIVER
Big Goose 7990 1.5 2.4 62 2.3 4.0 58
Bone Springs Div 9350 4.7 5.1 92 3.9 4.9 80
Burgess Junction 7880 1.8 3.1 58 2.3 4.2 55
Dome Lake 8880 2.8 3.7 76 3.2 4.9 65
Little Goose 8870 1.8 -M * 3.8 -M *
Sucker Creek 8880 2.3 3.3 70 -M 4.7 *
Tie Creek 6870 .1 .8 12 2.8 4.2 67
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Basin Index (%) 72 65
BELLE FOURCHE
Cole Canyon 5910 .1 .8 12 2.1 3.6 58
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Basin Index (%) 12 58
CHEYENNE RIVER BASIN
Blind Park 6890 1.5 1.8 83 3.2 4.4 73
North Rapid Creek 6130 1.6 1.5 107 2.1 3.7 57
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Basin Index (%) 94 65
UPPER N. PLATTE
Arapaho Ridge 10960 5.3 5.8 91 5.7 6.8 84
Blackhall Mtn 9820 6.5 -M * 7.1 -M *
Columbine 9160 2.5 4.6 54 6.7 7.0 96
Divide Peak 8880 2.7 4.5 60 5.9 6.7 88
Joe Wright 10120 4.1 6.0 68 9.4 8.1 116
Laprele Creek 8375 1.3 2.3 57 2.7 4.1 66
Med Bow 10500 9.2 -M * 8.2 -M *
North French Creek 10130 6.6 7.0 94 7.4 7.7 96
Never Summer 10280 5.8 5.0 116 5.9 -M *
Old Battle 10000 6.0 7.8 77 6.0 9.9 61
Rawah 9020 2.6 2.5 104 5.8 4.9 118
Sage Creek Basin 7850 1.7 2.2 77 3.2 4.5 71
Sand Lake 10050 7.6 7.3 104 6.7 7.3 92
South Brush Creek 8440 2.7 2.8 96 4.3 4.9 88
Tower 10500 7.0 11.5 61 9.3 11.5 81
Webber Springs 9250 3.6 5.0 72 5.8 7.7 75
Willow Creek Pass 9540 4.8 3.7 130 5.0 4.5 111
Zirkel 9340 3.9 4.7 83 8.5 8.1 105
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Basin Index (%) 82 89
SWEETWATER
Deer Park 9700 5.2 4.1 127 6.0 5.6 107
Larsen Creek 9000 1.8 2.5 72 3.8 -M *
South Pass 9040 4.3 3.9 110 3.6 5.3 68
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Basin Index (%) 108 88
LOWER N. PLATTE
Casper Mtn. 7900 1.6 3.5 46 2.0 5.4 37
Laprele Creek 8375 1.3 2.3 57 2.7 4.1 66
Reno Hill 8400 2.7 3.6 75 3.7 5.0 74
Windy Peak 7900 .8 1.8 44 2.7 3.6 75
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Basin Index (%) 57 61
LARAMIE RIVER
Brooklyn Lake 10240 4.2 4.3 98 5.8 5.8 100
Cinnabar Park 9574 5.9 5.4 109 7.7 6.7 115
Crow Creek 8330 .0 2.0 0 4.0 3.6 111
Deadman Hill 10220 6.7 4.8 140 7.0 5.3 132
Rawah 9020 2.6 2.5 104 5.8 4.9 118
Roach 9700 4.4 4.0 110 6.5 5.7 114
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Basin Index (%) 103 115
S. PLATTE
Black Mountain 8920 3.1 -M * 5.2 -M *
Crow Creek 8330 .0 2.0 0 4.0 3.6 111
Deadman Hill 10220 6.7 4.8 140 7.0 5.3 132
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Basin Index (%) 99 124
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 1.5 0 3.0 4.6 65
Divide Peak 8880 2.7 4.5 60 5.9 6.7 88
Elk River 8700 2.7 3.0 90 5.1 5.7 89
Little Snake River 8915 3.0 3.8 79 6.9 8.7 79
Old Battle 10000 6.0 7.8 77 6.0 9.9 61
Sage Creek Basin 7850 1.7 2.2 77 3.2 4.5 71
Sandstone RS 8150 1.0 2.2 45 2.7 5.4 50
Whiskey Park 8950 3.3 4.8 69 6.2 7.4 84
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Basin Index (%) 68 74
UPPER GREEN RIVER
Big Sandy Opening 9080 3.6 3.7 97 4.2 4.0 105
Blind Bull Sum 8650 11.1 5.1 218 7.1 5.7 125
East Rim Divide 7930 3.1 2.0 155 4.0 3.4 118
Elkhart Park G.S. 9400 3.5 3.3 106 3.8 4.2 90
Gros Ventre Summit 8750 6.6 3.7 178 6.2 4.2 148
Gunsight Pass 9820 5.6 3.3 170 6.3 4.1 154
Kendall R.S. 7740 3.9 2.6 150 5.3 4.0 132
Loomis Park 8240 4.8 3.2 150 5.8 4.8 121
New Fork Lake 8340 3.0 2.3 130 2.8 3.4 82
Pocket Creek 9360 4.1 -M * 3.8 -M *
Snider Basin 8060 2.3 2.8 82 4.7 3.9 121
Spring Creek Divide 9000 6.8 5.2 131 7.5 6.5 115
Triple Peak 8500 7.4 5.0 148 9.8 6.8 144
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Basin Index (%) 146 123
LOWER GREEN RIVER
Blacks Fork Jct 8869 1.7 -M * 2.7 -M *
Buck Pasture 9632 2.9 -M * 3.6 -M *
EF Blacks Fork GS 9360 1.9 -M * 3.0 -M *
Hams Fork 7840 1.2 2.2 55 3.0 3.3 91
Hewinta 9500 1.4 2.0 70 3.0 4.6 65
Hickerson Park 9122 1.9 1.5 127 1.6 3.8 42
Hole-in-Rock 9168 1.3 1.7 76 2.0 3.5 57
Indian Creek 9425 5.9 5.7 104 4.9 5.9 83
Kelley R.S. 8180 3.0 3.0 100 3.9 5.0 78
Spirit Lk 10235 2.2 -M * 2.4 -M *
Steel Creek Park 10158 4.0 4.0 100 3.9 5.3 74
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Basin Index (%) 93 71
UPPER BEAR RIVER
Bear River RS 8777 1.5 -M * 3.0 -M *
Bug Lake 7987 3.0 3.5 86 5.4 5.5 98
Burts Miller Ranch 8000 .2 -M * 1.8 -M *
Chalk Creek #1 9171 3.7 5.3 70 4.7 7.6 62
Hayden Fork 9130 2.3 3.0 77 4.0 6.3 63
Kelley R.S. 8180 3.0 3.0 100 3.9 5.0 78
Lily Lake 9133 1.4 2.9 48 3.1 5.5 56
Monte Cristo 8932 5.2 5.6 93 5.6 7.3 77
Salt River Summit 7760 1.8 2.1 86 3.7 4.4 84
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Basin Index (%) 80 73
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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.