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 SUNDAY: DECEMBER 9 , 2018
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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 7060 4.4 4.7 94 6.5 7.3 89
Black Bear 8170 -M 11.3 * -M 12.6 *
Blind Bull Sum 8650 5.4 6.2 87 5.5 6.8 81
Cottonwood Creek 7670 6.0 5.5 109 8.4 8.0 105
East Rim Divide 7930 2.4 2.4 100 3.8 4.0 95
Grand Targhee 9260 15.1 10.4 145 13.0 10.6 123
Granite Creek 6770 3.5 3.5 100 6.2 6.5 95
Grassy Lake 7265 7.3 7.9 92 11.0 11.8 93
Gros Ventre Summit 8750 2.5 4.5 56 3.6 4.7 77
Gunsight Pass 9820 3.0 3.8 79 5.5 4.7 117
Lewis Lake Divide 7850 6.2 8.8 70 10.1 11.9 85
Phillips Bench 8200 4.9 7.1 69 8.5 9.0 94
Salt River Summit 7640 3.0 2.7 111 5.1 5.2 98
Snake River Station 6920 4.2 3.9 108 8.7 7.9 110
Spring Creek Divide 9000 6.1 6.2 98 7.7 7.7 100
Thumb Divide 7980 2.3 3.8 61 4.9 6.4 77
Togwotee Pass 9580 7.5 8.2 91 8.6 8.5 101
Two Ocean Plateau 9240 8.8 9.8 90 7.7 9.5 81
Willow Creek 8080 7.1 7.0 101 11.5 11.2 103
Younts Peak 8350 -M 4.9 * -M 5.8 *
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Basin Index (%) 94 96
MADISON-GALLATIN
Black Bear 8170 -M 11.3 * -M 12.6 *
Canyon 7870 2.8 3.3 85 4.8 5.6 86
Madison Plateau 7750 4.1 6.6 62 6.1 8.7 70
West Yellowstone 6700 2.2 2.6 85 3.8 4.9 78
Whiskey Creek 6800 2.1 4.0 52 3.1 7.0 44
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Basin Index (%) 68 68
YELLOWSTONE
Beartooth Lake 9360 5.6 7.1 79 4.8 6.5 74
Burnt Mtn 5880 2.3 1.4 164 5.8 5.7 102
Canyon 7870 2.8 3.3 85 4.8 5.6 86
Cole Creek 7850 6.2 5.0 124 6.0 5.4 111
Evening Star 9200 8.4 8.2 102 11.1 9.8 113
Fisher Creek 9100 7.1 9.9 72 10.8 10.8 100
Northeast Entrance 7350 2.9 2.2 132 5.5 4.7 117
Parker Peak 9400 8.0 6.9 116 9.0 6.5 138
Sylvan Lake 8420 7.5 6.2 121 12.0 8.4 143
Thumb Divide 7980 2.3 3.8 61 4.9 6.4 77
Two Ocean Plateau 9240 8.8 9.8 90 7.7 9.5 81
White Mill 8700 5.5 6.9 80 5.2 8.3 63
Wolverine 7650 2.7 2.8 96 4.8 4.7 102
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Basin Index (%) 95 100
WIND RIVER
Burroughs Creek 8750 2.4 -M * 3.6 -M *
Castle Creek 8400 -M -M * -M -M *
Cold Springs 9630 2.1 2.5 84 2.4 4.0 60
Deer Park 9700 4.3 4.6 93 4.6 6.6 70
Hobbs Park 10100 3.6 5.2 69 3.2 5.0 64
Kirwin 9550 2.6 3.7 70 2.7 4.5 60
Little Warm 9370 2.1 3.4 62 2.7 4.8 56
Owl Creek 8975 2.5 1.9 132 3.1 2.4 129
South Pass 9040 3.3 4.6 72 4.0 6.3 63
St. Lawrence Alt 8620 1.3 2.3 57 3.3 3.6 92
Togwotee Pass 9580 7.5 8.2 91 8.6 8.5 101
Townsend Creek 8700 2.9 2.9 100 3.9 4.8 81
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Basin Index (%) 82 76
BIGHORN BASIN
Bald Mtn. 9380 7.5 6.3 119 5.0 5.8 86
Bear Trap Meadow 8200 3.4 1.8 189 3.6 3.5 103
Bone Springs Div 9350 5.6 5.6 100 5.0 5.4 93
Grave Springs 8550 2.9 2.2 132 4.5 4.0 112
Kirwin 9550 2.6 3.7 70 2.7 4.5 60
Marquette 8760 3.2 -M * 4.1 -M *
Middle Powder 7760 3.5 3.3 106 3.0 4.8 62
Owl Creek 8975 2.5 1.9 132 3.1 2.4 129
Powder River Pass 9480 4.0 3.4 118 3.7 4.6 80
Shell Creek 9580 -M 5.2 * -M 5.1 *
Timber Creek 7950 1.4 1.9 74 3.0 3.4 88
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Basin Index (%) 111 88
SHOSHONE RIVER
Blackwater 9780 8.7 7.6 114 9.0 7.5 120
Evening Star 9200 8.4 8.2 102 11.1 9.8 113
Marquette 8760 3.2 -M * 4.1 -M *
Sylvan Road 7120 4.1 3.5 117 7.1 6.8 104
Younts Peak 8350 -M 4.9 * -M 5.8 *
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Basin Index (%) 110 113
POWDER RIVER
Bear Trap Meadow 8200 3.4 1.8 189 3.6 3.5 103
Cloud Peak Reservoir 9860 5.0 4.3 116 5.1 5.1 100
Grave Springs 8550 2.9 2.2 132 4.5 4.0 112
Hansen Sawmill 8360 1.9 1.9 100 3.6 3.3 109
Middle Powder 7760 3.5 3.3 106 3.0 4.8 62
Powder River Pass 9480 4.0 3.4 118 3.7 4.6 80
Soldier Park 8720 1.6 -M * 3.4 -M *
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Basin Index (%) 122 93
TONGUE RIVER
Big Goose 7990 2.4 2.8 86 4.5 4.3 105
Bone Springs Div 9350 5.6 5.6 100 5.0 5.4 93
Burgess Junction 7880 3.0 3.4 88 3.9 4.6 85
Dome Lake 8880 2.5 4.1 61 3.8 5.4 70
Little Goose 8870 3.7 -M * 3.7 -M *
Sucker Creek 8880 4.5 3.7 122 4.4 5.2 85
Tie Creek 6870 1.4 1.0 140 5.1 4.5 113
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Basin Index (%) 94 91
BELLE FOURCHE
Cole Canyon 5910 1.7 1.1 155 4.4 3.9 113
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Basin Index (%) 155 113
CHEYENNE RIVER BASIN
Blind Park 6890 2.2 1.9 116 2.7 4.8 56
North Rapid Creek 6130 1.6 1.9 84 2.5 4.0 62
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Basin Index (%) 100 59
UPPER N. PLATTE
Arapaho Ridge 10960 8.7 6.5 134 10.1 8.3 122
Blackhall Mtn 9820 9.4 -M * 12.6 -M *
Columbine 9160 7.1 5.4 131 10.1 8.2 123
Divide Peak 8880 5.4 5.4 100 8.4 7.6 111
Joe Wright 10120 6.9 6.7 103 12.4 9.1 136
Laprele Creek 8375 4.4 2.5 176 5.6 4.5 124
Med Bow 10500 14.1 -M * 15.3 -M *
North French Creek 10130 11.3 8.1 140 13.3 8.7 153
Never Summer 10280 7.6 5.8 131 8.3 -M *
Old Battle 10000 11.1 8.9 125 13.4 11.6 116
Rawah 9020 3.2 3.0 107 6.1 5.6 109
Sage Creek Basin 7850 3.9 3.1 126 6.4 5.2 123
Sand Lake 10050 9.9 8.2 121 8.9 8.3 107
South Brush Creek 8440 4.0 3.1 129 5.1 5.4 94
Tower 10500 15.2 13.2 115 14.5 13.3 109
Webber Springs 9250 6.9 6.1 113 10.7 8.9 120
Willow Creek Pass 9540 5.5 3.9 141 7.3 5.0 146
Zirkel 9340 8.4 5.6 150 12.9 9.9 130
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Basin Index (%) 125 121
SWEETWATER
Deer Park 9700 4.3 4.6 93 4.6 6.6 70
Larsen Creek 9000 2.0 3.1 65 4.9 -M *
South Pass 9040 3.3 4.6 72 4.0 6.3 63
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Basin Index (%) 78 67
LOWER N. PLATTE
Casper Mtn. 7900 4.4 3.9 113 4.6 5.9 78
Laprele Creek 8375 4.4 2.5 176 5.6 4.5 124
Reno Hill 8400 4.8 4.3 112 5.8 5.5 105
Windy Peak 7900 4.0 2.1 190 4.1 4.0 102
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Basin Index (%) 138 101
LARAMIE RIVER
Brooklyn Lake 10240 8.1 5.1 159 9.9 6.7 148
Cinnabar Park 9574 8.1 6.2 131 10.4 8.1 128
Crow Creek 8330 1.6 3.2 50 4.1 4.1 100
Deadman Hill 10220 6.4 5.1 125 6.8 5.9 115
Rawah 9020 3.2 3.0 107 6.1 5.6 109
Roach 9700 4.9 4.6 107 6.9 6.5 106
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Basin Index (%) 119 120
S. PLATTE
Black Mountain 8920 2.8 -M * 4.1 -M *
Crow Creek 8330 1.6 3.2 50 4.1 4.1 100
Deadman Hill 10220 6.4 5.1 125 6.8 5.9 115
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Basin Index (%) 96 109
LITTLE SNAKE RIVER
Battle Mountain 7440 4.0 2.2 182 5.4 5.2 104
Divide Peak 8880 5.4 5.4 100 8.4 7.6 111
Elk River 8700 4.8 3.9 123 5.7 6.5 88
Little Snake River 8915 7.9 4.5 176 15.1 10.6 142
Old Battle 10000 11.1 8.9 125 13.4 11.6 116
Sage Creek Basin 7850 3.9 3.1 126 6.4 5.2 123
Sandstone RS 8150 5.1 2.7 189 6.9 6.2 111
Whiskey Park 8950 8.1 6.3 129 12.0 8.6 140
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Basin Index (%) 136 119
UPPER GREEN RIVER
Big Sandy Opening 9080 3.4 4.0 85 4.6 4.7 98
Blind Bull Sum 8650 5.4 6.2 87 5.5 6.8 81
East Rim Divide 7930 2.4 2.4 100 3.8 4.0 95
Elkhart Park G.S. 9400 3.7 3.8 97 5.0 4.8 104
Gros Ventre Summit 8750 2.5 4.5 56 3.6 4.7 77
Gunsight Pass 9820 3.0 3.8 79 5.5 4.7 117
Kendall R.S. 7740 2.5 3.1 81 3.9 4.7 83
Loomis Park 8240 4.0 3.8 105 5.6 5.7 98
New Fork Lake 8340 2.6 2.7 96 3.5 3.8 92
Pocket Creek 9360 5.3 -M * 6.1 -M *
Snyder Basin 8060 3.1 3.1 100 5.2 4.6 113
Spring Creek Divide 9000 6.1 6.2 98 7.7 7.7 100
Triple Peak 8500 6.5 5.7 114 8.6 8.0 108
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Basin Index (%) 92 97
LOWER GREEN RIVER
Blacks Fork Jct 8869 2.1 -M * 4.7 -M *
Buck Pasture 9632 4.2 -M * 7.7 -M *
EF Blacks Fork GS 9360 2.9 -M * 4.4 -M *
Hams Fork 7840 2.9 2.8 104 4.5 3.8 118
Hewinta 9500 2.4 2.2 109 5.4 5.1 106
Hickerson Park 9122 2.2 1.7 129 4.7 4.1 115
Hole-in-Rock 9168 1.5 1.9 79 4.5 3.9 115
Indian Creek 9425 5.4 6.7 81 5.3 7.0 76
Kelley R.S. 8180 4.1 3.7 111 5.3 5.9 90
Spirit Lk 10235 4.2 -M * 6.4 -M *
Steel Creek Park 10158 4.5 4.8 94 6.6 5.8 114
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Basin Index (%) 97 102
UPPER BEAR RIVER
Bear River RS 8777 2.4 -M * 5.5 -M *
Bug Lake 7987 3.5 4.2 83 8.0 6.6 121
Burts Miller Ranch 8000 1.0 -M * 3.0 -M *
Chalk Creek #1 9171 4.9 7.0 70 10.3 8.7 118
Hayden Fork 9130 3.7 3.5 106 8.2 7.1 115
Kelley R.S. 8180 4.1 3.7 111 5.3 5.9 90
Lily Lake 9133 3.3 3.5 94 6.3 6.2 102
Monte Cristo 8932 6.2 6.8 91 8.8 8.5 104
Salt River Summit 7640 3.0 2.7 111 5.1 5.2 98
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Basin Index (%) 91 108
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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.