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: DECEMBER 12 , 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 5.9 5.1 116 8.4 7.6 111
Black Bear 8170 13.5 12.3 110 13.0 13.3 98
Blind Bull Sum 8650 11.2 6.6 170 7.4 7.1 104
Cottonwood Creek 7670 5.4 5.9 92 7.0 8.4 83
East Rim Divide 7930 3.1 2.6 119 4.1 4.1 100
Grand Targhee 9260 20.8 11.4 182 12.7 10.9 117
Granite Creek 6770 5.2 3.9 133 8.1 6.8 119
Grassy Lake 7265 7.7 8.6 90 11.4 12.3 93
Gros Ventre Summit 8750 6.9 4.5 153 6.4 4.8 133
Gunsight Pass 9820 6.1 4.1 149 6.7 4.8 140
Lewis Lake Divide 7850 9.9 9.2 108 13.3 12.5 106
Phillips Bench 8200 7.7 7.5 103 9.4 9.4 100
Salt River Summit 7760 2.3 3.0 77 4.1 5.5 75
Snake River Station 6920 4.8 4.3 112 8.6 8.2 105
Spring Creek Divide 9000 7.6 6.6 115 8.2 8.1 101
Thumb Divide 7980 6.4 4.0 160 8.2 6.6 124
Togwotee Pass 9580 13.2 8.4 157 13.0 8.9 146
Two Ocean Plateau 9240 17.0 10.2 167 11.6 9.9 117
Willow Creek 8380 9.0 7.5 120 12.5 11.7 107
Younts Peak 8350 -M 5.1 * -M 6.0 *
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Basin Index (%) 130 108
MADISON-GALLATIN
Black Bear 8170 13.5 12.3 110 13.0 13.3 98
Canyon 7870 -M 3.5 * 6.1 5.8 105
Madison Plateau 7750 7.7 7.1 108 9.0 9.1 99
West Yellowstone 6700 2.9 2.8 104 6.0 5.0 120
Whiskey Creek 6800 3.5 4.2 83 5.8 7.4 78
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Basin Index (%) 105 98
YELLOWSTONE
Beartooth Lake 9360 13.1 7.4 177 11.4 6.8 168
Burnt Mtn 5880 1.0 1.5 67 6.2 5.8 107
Canyon 7870 -M 3.5 * 6.1 5.8 105
Cole Creek 7850 5.9 5.3 111 4.5 5.5 82
Evening Star 9200 14.8 8.4 176 15.2 10.1 150
Fisher Creek 9100 17.9 10.5 170 15.3 11.3 135
Northeast Entrance 7350 2.8 2.4 117 6.0 4.8 125
Parker Peak 9400 12.9 7.2 179 10.7 6.7 160
Sylvan Lake 8420 9.5 6.5 146 10.1 8.7 116
Thumb Divide 7980 6.4 4.0 160 8.2 6.6 124
Two Ocean Plateau 9240 17.0 10.2 167 11.6 9.9 117
White Mill 8700 13.7 7.1 193 9.7 8.6 113
Wolverine 7650 3.3 3.1 106 7.2 4.9 147
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Basin Index (%) 161 128
WIND RIVER
Burroughs Creek 8750 5.4 -M * 6.7 -M *
Castle Creek 8400 2.6 -M * 4.2 -M *
Cold Springs 9630 3.5 2.6 135 4.3 4.2 102
Deer Park 9700 5.9 4.8 123 6.6 6.7 99
Hobbs Park 10100 8.7 5.5 158 7.3 5.2 140
Kirwin 9550 8.6 3.9 221 7.2 4.6 157
Little Warm 9370 7.5 3.5 214 7.4 5.0 148
Owl Creek 8975 1.7 2.0 85 3.3 2.5 132
South Pass 9040 4.9 4.9 100 4.0 6.6 61
St. Lawrence Alt 8620 2.4 2.5 96 4.7 3.7 127
Togwotee Pass 9580 13.2 8.4 157 13.0 8.9 146
Townsend Creek 8700 3.3 3.0 110 4.7 4.9 96
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Basin Index (%) 145 120
BIGHORN BASIN
Bald Mtn. 9380 7.4 6.5 114 4.8 6.0 80
Bear Trap Meadow 8200 3.2 1.8 178 4.3 3.6 119
Bone Springs Div 9350 5.7 5.8 98 4.5 5.6 80
Grave Springs 8550 2.3 2.3 100 2.3 4.1 56
Kirwin 9550 8.6 3.9 221 7.2 4.6 157
Marquette 8760 3.1 -M * 5.5 -M *
Middle Powder 7760 3.5 3.4 103 2.9 4.9 59
Owl Creek 8975 1.7 2.0 85 3.3 2.5 132
Powder River Pass 9480 6.2 3.5 177 5.4 4.7 115
Shell Creek 9580 8.1 5.4 150 5.2 5.2 100
Timber Creek 7950 1.3 2.0 65 1.2 3.4 35
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Basin Index (%) 131 92
SHOSHONE RIVER
Blackwater 9780 14.8 7.9 187 12.3 7.9 156
Evening Star 9200 14.8 8.4 176 15.2 10.1 150
Marquette 8760 3.1 -M * 5.5 -M *
Sylvan Road 7120 4.0 3.7 108 8.2 7.1 115
Younts Peak 8350 -M 5.1 * -M 6.0 *
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Basin Index (%) 168 142
POWDER RIVER
Bear Trap Meadow 8200 3.2 1.8 178 4.3 3.6 119
Cloud Peak Reservoir 9860 4.9 4.5 109 5.7 5.2 110
Grave Springs 8550 2.3 2.3 100 2.3 4.1 56
Hansen Sawmill 8360 2.4 2.0 120 3.7 3.4 109
Middle Powder 7760 3.5 3.4 103 2.9 4.9 59
Powder River Pass 9480 6.2 3.5 177 5.4 4.7 115
Soldier Park 8720 1.4 -M * 3.8 -M *
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Basin Index (%) 129 94
TONGUE RIVER
Big Goose 7990 2.2 2.9 76 3.0 4.4 68
Bone Springs Div 9350 5.7 5.8 98 4.5 5.6 80
Burgess Junction 7880 2.6 3.5 74 2.9 4.7 62
Dome Lake 8880 3.3 4.2 79 3.8 5.5 69
Little Goose 8870 2.7 -M * 4.6 -M *
Sucker Creek 8880 3.3 3.9 85 -M 5.3 *
Tie Creek 6870 .7 1.1 64 3.5 4.6 76
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Basin Index (%) 83 71
BELLE FOURCHE
Cole Canyon 5910 1.3 1.1 118 3.2 3.9 82
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Basin Index (%) 118 82
CHEYENNE RIVER BASIN
Blind Park 6890 2.4 2.0 120 4.1 4.8 85
North Rapid Creek 6130 2.5 2.1 119 2.9 4.1 71
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Basin Index (%) 120 79
UPPER N. PLATTE
Arapaho Ridge 10960 5.9 6.9 86 6.3 8.5 74
Blackhall Mtn 9820 7.8 -M * 8.5 -M *
Columbine 9160 3.2 5.8 55 7.2 8.6 84
Divide Peak 8880 3.8 5.7 67 7.0 7.9 89
Joe Wright 10120 5.2 7.2 72 10.6 9.4 113
Laprele Creek 8375 1.8 2.8 64 3.3 4.7 70
Med Bow 10500 11.5 -M * 10.1 -M *
North French Creek 10130 8.2 8.6 95 9.1 9.0 101
Never Summer 10280 6.3 6.2 102 6.1 -M *
Old Battle 10000 7.4 9.2 80 7.1 12.2 58
Rawah 9020 3.5 3.2 109 6.6 5.8 114
Sage Creek Basin 7850 2.1 3.6 58 3.9 5.4 72
Sand Lake 10050 8.9 8.6 103 8.0 8.6 93
South Brush Creek 8440 3.4 3.3 103 4.9 5.5 89
Tower 10500 8.9 14.0 64 10.9 14.0 78
Webber Springs 9250 4.7 6.8 69 7.0 9.2 76
Willow Creek Pass 9540 5.2 4.0 130 5.5 5.2 106
Zirkel 9340 4.8 6.4 75 9.5 10.2 93
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Basin Index (%) 81 86
SWEETWATER
Deer Park 9700 5.9 4.8 123 6.6 6.7 99
Larsen Creek 9000 2.1 3.4 62 4.2 -M *
South Pass 9040 4.9 4.9 100 4.0 6.6 61
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Basin Index (%) 98 80
LOWER N. PLATTE
Casper Mtn. 7900 2.9 4.2 69 2.9 6.1 48
Laprele Creek 8375 1.8 2.8 64 3.3 4.7 70
Reno Hill 8400 3.9 4.5 87 4.9 5.7 86
Windy Peak 7900 1.3 2.2 59 3.1 4.1 76
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Basin Index (%) 72 69
LARAMIE RIVER
Brooklyn Lake 10240 5.4 5.7 95 7.1 7.0 101
Cinnabar Park 9574 6.7 6.8 99 8.7 8.5 102
Crow Creek 8330 .0 3.4 0 4.4 4.3 102
Deadman Hill 10220 7.6 5.2 146 7.9 6.1 130
Rawah 9020 3.5 3.2 109 6.6 5.8 114
Roach 9700 4.8 4.7 102 7.0 6.8 103
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Basin Index (%) 97 108
S. PLATTE
Black Mountain 8920 3.6 -M * 5.9 -M *
Crow Creek 8330 .0 3.4 0 4.4 4.3 102
Deadman Hill 10220 7.6 5.2 146 7.9 6.1 130
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Basin Index (%) 88 118
LITTLE SNAKE RIVER
Battle Mountain 7440 .9 2.4 38 -M 5.4 *
Divide Peak 8880 3.8 5.7 67 7.0 7.9 89
Elk River 8700 3.4 4.3 79 6.0 6.8 88
Little Snake River 8915 4.1 4.9 84 8.6 11.0 78
Old Battle 10000 7.4 9.2 80 7.1 12.2 58
Sage Creek Basin 7850 2.1 3.6 58 3.9 5.4 72
Sandstone RS 8150 1.8 3.1 58 3.1 6.4 48
Whiskey Park 8950 4.8 6.8 71 7.7 8.9 87
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Basin Index (%) 71 74
UPPER GREEN RIVER
Big Sandy Opening 9080 4.2 4.3 98 4.7 4.9 96
Blind Bull Sum 8650 11.2 6.6 170 7.4 7.1 104
East Rim Divide 7930 3.1 2.6 119 4.1 4.1 100
Elkhart Park G.S. 9400 3.8 4.0 95 4.3 4.9 88
Gros Ventre Summit 8750 6.9 4.5 153 6.4 4.8 133
Gunsight Pass 9820 6.1 4.1 149 6.7 4.8 140
Kendall R.S. 7740 4.2 3.3 127 5.3 4.8 110
Loomis Park 8240 5.0 4.1 122 5.9 6.0 98
New Fork Lake 8340 3.3 3.0 110 3.1 3.9 79
Pocket Creek 9360 4.7 -M * 3.8 -M *
Snider Basin 8060 2.3 3.4 68 5.0 4.8 104
Spring Creek Divide 9000 7.6 6.6 115 8.2 8.1 101
Triple Peak 8500 8.0 5.9 136 10.4 8.4 124
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Basin Index (%) 125 107
LOWER GREEN RIVER
Blacks Fork Jct 8869 2.1 -M * 3.1 -M *
Buck Pasture 9632 3.3 -M * 4.3 -M *
EF Blacks Fork GS 9360 2.2 -M * 3.0 -M *
Hams Fork 7840 1.6 3.0 53 3.2 4.0 80
Hewinta 9500 1.4 2.4 58 3.7 5.3 70
Hickerson Park 9122 2.1 1.9 111 1.7 4.2 40
Hole-in-Rock 9168 1.6 2.1 76 2.2 4.0 55
Indian Creek 9425 6.6 7.1 93 5.4 7.3 74
Kelley R.S. 8180 3.4 4.0 85 4.5 6.2 73
Spirit Lk 10235 2.4 -M * 2.7 -M *
Steel Creek Park 10158 4.2 5.0 84 4.4 6.0 73
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Basin Index (%) 82 68
UPPER BEAR RIVER
Bear River RS 8777 1.9 -M * 3.4 -M *
Bug Lake 7987 4.2 4.6 91 6.0 6.9 87
Burts Miller Ranch 8000 .6 -M * 2.2 -M *
Chalk Creek #1 9171 4.4 7.5 59 5.4 9.1 59
Hayden Fork 9130 3.0 3.7 81 4.6 7.4 62
Kelley R.S. 8180 3.4 4.0 85 4.5 6.2 73
Lily Lake 9133 2.3 3.8 61 3.6 6.4 56
Monte Cristo 8932 6.4 7.2 89 6.6 8.9 74
Salt River Summit 7760 2.3 3.0 77 4.1 5.5 75
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Basin Index (%) 77 69
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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.
