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 SATURDAY: DECEMBER 1 , 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 4.2 4.0 105 6.2 6.0 103
Black Bear 8170 -M 9.0 * -M 10.6 *
Blind Bull Sum 8650 5.1 5.1 100 5.3 5.7 93
Cottonwood Creek 7670 5.3 4.4 120 7.7 6.9 112
East Rim Divide 7930 2.3 2.0 115 3.7 3.4 109
Grand Targhee 9260 14.5 9.9 146 12.5 9.8 128
Granite Creek 6770 3.5 2.6 135 6.0 5.4 111
Grassy Lake 7265 7.0 6.6 106 10.3 9.9 104
Gros Ventre Summit 8750 2.5 3.7 68 3.1 4.2 74
Gunsight Pass 9820 3.0 3.3 91 5.3 4.1 129
Lewis Lake Divide 7850 6.0 7.4 81 9.7 9.8 99
Phillips Bench 8200 4.9 5.6 88 8.3 7.4 112
Salt River Summit 7640 2.6 2.1 124 4.9 4.4 111
Snake River Station 6920 4.0 3.3 121 8.4 6.6 127
Spring Creek Divide 9000 5.8 5.2 112 7.4 6.5 114
Thumb Divide 7980 2.3 3.2 72 4.8 5.4 89
Togwotee Pass 9580 7.3 7.2 101 8.3 7.3 114
Two Ocean Plateau 9240 8.6 8.6 100 7.5 8.1 93
Willow Creek 8080 6.3 5.7 111 10.6 9.6 110
Younts Peak 8350 -M 4.3 * -M 5.0 *
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Basin Index (%) 106 108
MADISON-GALLATIN
Black Bear 8170 -M 9.0 * -M 10.6 *
Canyon 7870 2.6 3.0 87 4.4 4.8 92
Madison Plateau 7750 3.8 5.1 75 5.9 7.2 82
West Yellowstone 6700 2.1 1.9 111 3.7 4.2 88
Whiskey Creek 6800 1.9 3.2 59 2.7 5.8 47
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Basin Index (%) 79 76
YELLOWSTONE
Beartooth Lake 9360 5.4 6.1 89 4.6 5.5 84
Burnt Mtn 5880 2.1 1.3 162 5.5 5.1 108
Canyon 7870 2.6 3.0 87 4.4 4.8 92
Cole Creek 7850 6.3 4.1 154 6.3 5.0 126
Evening Star 9200 8.3 7.2 115 11.0 8.3 133
Fisher Creek 9100 6.8 8.8 77 10.4 9.1 114
Northeast Entrance 7350 2.8 1.7 165 5.4 4.1 132
Parker Peak 9400 7.8 6.1 128 8.8 5.6 157
Sylvan Lake 8420 6.7 5.2 129 11.0 7.2 153
Thumb Divide 7980 2.3 3.2 72 4.8 5.4 89
Two Ocean Plateau 9240 8.6 8.6 100 7.5 8.1 93
White Mill 8700 5.4 6.0 90 5.2 7.1 73
Wolverine 7650 2.7 2.0 135 4.9 4.1 120
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Basin Index (%) 107 113
WIND RIVER
Burroughs Creek 8750 2.5 -M * 3.8 -M *
Castle Creek 8400 1.1 -M * 2.3 -M *
Cold Springs 9630 2.1 2.5 84 2.3 3.7 62
Deer Park 9700 4.3 4.1 105 4.6 5.6 82
Hobbs Park 10100 3.7 4.5 82 3.3 4.5 73
Kirwin 9550 2.7 3.4 79 2.7 4.0 68
Little Warm 9370 2.1 2.9 72 3.2 4.2 76
Owl Creek 8975 2.4 1.6 150 3.0 2.2 136
South Pass 9040 3.4 3.9 87 4.0 5.3 75
St. Lawrence Alt 8620 1.4 2.1 67 3.3 3.2 103
Togwotee Pass 9580 7.3 7.2 101 8.3 7.3 114
Townsend Creek 8700 3.0 2.5 120 4.0 4.3 93
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Basin Index (%) 93 87
BIGHORN BASIN
Bald Mtn. 9380 7.4 5.8 128 4.8 5.2 92
Bear Trap Meadow 8200 3.1 1.4 221 3.3 3.2 103
Bone Springs Div 9350 5.5 5.1 108 4.7 4.9 96
Grave Springs 8550 2.8 1.9 147 3.6 3.7 97
Kirwin 9550 2.7 3.4 79 2.7 4.0 68
Marquette 8760 3.2 -M * 4.0 -M *
Middle Powder 7760 3.3 3.1 106 2.9 4.4 66
Owl Creek 8975 2.4 1.6 150 3.0 2.2 136
Powder River Pass 9480 3.7 2.9 128 3.4 4.1 83
Shell Creek 9580 6.1 5.0 122 5.5 4.6 120
Timber Creek 7950 1.4 1.7 82 2.9 3.2 91
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Basin Index (%) 120 93
SHOSHONE RIVER
Blackwater 9780 8.7 7.1 123 9.0 6.6 136
Evening Star 9200 8.3 7.2 115 11.0 8.3 133
Marquette 8760 3.2 -M * 4.0 -M *
Sylvan Road 7120 3.8 2.8 136 6.2 5.9 105
Younts Peak 8350 -M 4.3 * -M 5.0 *
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Basin Index (%) 122 126
POWDER RIVER
Bear Trap Meadow 8200 3.1 1.4 221 3.3 3.2 103
Cloud Peak Reservoir 9860 5.2 3.8 137 4.9 4.8 102
Grave Springs 8550 2.8 1.9 147 3.6 3.7 97
Hansen Sawmill 8360 1.8 1.6 112 3.4 3.0 113
Middle Powder 7760 3.3 3.1 106 2.9 4.4 66
Powder River Pass 9480 3.7 2.9 128 3.4 4.1 83
Soldier Park 8720 1.5 -M * 3.3 -M *
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Basin Index (%) 135 93
TONGUE RIVER
Big Goose 7990 2.3 2.4 96 4.3 4.0 108
Bone Springs Div 9350 5.5 5.1 108 4.7 4.9 96
Burgess Junction 7880 2.9 3.1 94 3.7 4.2 88
Dome Lake 8880 2.8 3.7 76 3.7 4.9 76
Little Goose 8870 3.7 -M * 3.6 -M *
Sucker Creek 8880 4.6 3.3 139 4.3 4.7 91
Tie Creek 6870 1.4 .8 175 5.0 4.2 119
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Basin Index (%) 106 96
BELLE FOURCHE
Cole Canyon 5910 1.1 .8 138 3.5 3.6 97
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Basin Index (%) 138 97
CHEYENNE RIVER BASIN
Blind Park 6890 1.8 1.8 100 2.4 4.4 55
North Rapid Creek 6130 1.2 1.5 80 2.1 3.7 57
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Basin Index (%) 91 56
UPPER N. PLATTE
Arapaho Ridge 10960 8.0 5.8 138 9.4 6.8 138
Blackhall Mtn 9820 8.8 -M * 12.0 -M *
Columbine 9160 6.2 4.6 135 9.1 7.0 130
Divide Peak 8880 5.1 4.5 113 7.7 6.7 115
Joe Wright 10120 6.2 6.0 103 11.5 8.1 142
Laprele Creek 8375 4.1 2.3 178 5.2 4.1 127
Med Bow 10500 12.8 -M * 13.9 -M *
North French Creek 10130 10.1 7.0 144 12.0 7.7 156
Never Summer 10280 7.1 5.0 142 7.8 -M *
Old Battle 10000 10.5 7.8 135 12.9 9.9 130
Rawah 9020 3.0 2.5 120 5.9 4.9 120
Sage Creek Basin 7850 3.6 2.2 164 6.1 4.5 136
Sand Lake 10050 9.1 7.3 125 8.1 7.3 111
South Brush Creek 8440 3.5 2.8 125 4.6 4.9 94
Tower 10500 13.3 11.5 116 13.0 11.5 113
Webber Springs 9250 6.7 5.0 134 10.2 7.7 132
Willow Creek Pass 9540 5.1 3.7 138 6.8 4.5 151
Zirkel 9340 8.0 4.7 170 12.3 8.1 152
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Basin Index (%) 133 130
SWEETWATER
Deer Park 9700 4.3 4.1 105 4.6 5.6 82
Larsen Creek 9000 2.1 2.5 84 4.9 -M *
South Pass 9040 3.4 3.9 87 4.0 5.3 75
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Basin Index (%) 93 79
LOWER N. PLATTE
Casper Mtn. 7900 4.0 3.5 114 4.1 5.4 76
Laprele Creek 8375 4.1 2.3 178 5.2 4.1 127
Reno Hill 8400 4.4 3.6 122 5.5 5.0 110
Windy Peak 7900 3.4 1.8 189 3.6 3.6 100
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Basin Index (%) 142 102
LARAMIE RIVER
Brooklyn Lake 10240 7.6 4.3 177 9.2 5.8 159
Cinnabar Park 9574 7.6 5.4 141 9.8 6.7 146
Crow Creek 8330 1.3 2.0 65 3.8 3.6 106
Deadman Hill 10220 6.1 4.8 127 6.4 5.3 121
Rawah 9020 3.0 2.5 120 5.9 4.9 120
Roach 9700 4.7 4.0 118 6.7 5.7 118
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Basin Index (%) 132 131
S. PLATTE
Black Mountain 8920 2.6 -M * 3.9 -M *
Crow Creek 8330 1.3 2.0 65 3.8 3.6 106
Deadman Hill 10220 6.1 4.8 127 6.4 5.3 121
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Basin Index (%) 109 115
LITTLE SNAKE RIVER
Battle Mountain 7440 3.5 1.5 233 4.2 4.6 91
Divide Peak 8880 5.1 4.5 113 7.7 6.7 115
Elk River 8700 4.5 3.0 150 5.1 5.7 89
Little Snake River 8915 7.4 3.8 195 14.2 8.7 163
Old Battle 10000 10.5 7.8 135 12.9 9.9 130
Sage Creek Basin 7850 3.6 2.2 164 6.1 4.5 136
Sandstone RS 8150 5.0 2.2 227 6.3 5.4 117
Whiskey Park 8950 7.4 4.8 154 11.2 7.4 151
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Basin Index (%) 158 128
UPPER GREEN RIVER
Big Sandy Opening 9080 3.4 3.7 92 4.6 4.0 115
Blind Bull Sum 8650 5.1 5.1 100 5.3 5.7 93
East Rim Divide 7930 2.3 2.0 115 3.7 3.4 109
Elkhart Park G.S. 9400 3.5 3.3 106 4.7 4.2 112
Gros Ventre Summit 8750 2.5 3.7 68 3.1 4.2 74
Gunsight Pass 9820 3.0 3.3 91 5.3 4.1 129
Kendall R.S. 7740 2.5 2.6 96 3.8 4.0 95
Loomis Park 8240 4.0 3.2 125 5.5 4.8 115
New Fork Lake 8340 2.5 2.3 109 3.1 3.4 91
Pocket Creek 9360 5.2 -M * 6.0 -M *
Snyder Basin 8060 3.1 2.8 111 4.9 3.9 126
Spring Creek Divide 9000 5.8 5.2 112 7.4 6.5 114
Triple Peak 8500 6.3 5.0 126 8.4 6.8 124
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Basin Index (%) 104 109
LOWER GREEN RIVER
Blacks Fork Jct 8869 1.8 -M * 4.5 -M *
Buck Pasture 9632 4.4 -M * 7.5 -M *
EF Blacks Fork GS 9360 3.0 -M * 4.4 -M *
Hams Fork 7840 2.5 2.2 114 4.2 3.3 127
Hewinta 9500 2.2 2.0 110 5.3 4.6 115
Hickerson Park 9122 2.1 1.5 140 4.7 3.8 124
Hole-in-Rock 9168 1.4 1.7 82 4.4 3.5 126
Indian Creek 9425 4.8 5.7 84 4.7 5.9 80
Kelley R.S. 8180 3.7 3.0 123 4.7 5.0 94
Spirit Lk 10235 4.1 -M * 6.6 -M *
Steel Creek Park 10158 4.3 4.0 108 6.2 5.3 117
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Basin Index (%) 104 109
UPPER BEAR RIVER
Bear River RS 8777 2.3 -M * 5.4 -M *
Bug Lake 7987 3.4 3.5 97 7.6 5.5 138
Burts Miller Ranch 8000 2.8 -M * 2.9 -M *
Chalk Creek #1 9171 4.5 5.3 85 9.8 7.6 129
Hayden Fork 9130 3.5 3.0 117 7.9 6.3 125
Kelley R.S. 8180 3.7 3.0 123 4.7 5.0 94
Lily Lake 9133 3.2 2.9 110 6.0 5.5 109
Monte Cristo 8932 5.6 5.6 100 7.9 7.3 108
Salt River Summit 7640 2.6 2.1 124 4.9 4.4 111
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Basin Index (%) 104 117
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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.