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 THURSDAY: DECEMBER 6 , 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 4.4 95 6.2 6.8 91
Black Bear 8170 -M 10.2 * -M 11.8 *
Blind Bull Sum 8650 5.2 5.9 88 5.4 6.4 84
Cottonwood Creek 7670 5.9 5.2 113 8.3 7.6 109
East Rim Divide 7930 2.3 2.2 105 3.7 3.8 97
Grand Targhee 9260 14.8 10.2 145 12.5 10.3 121
Granite Creek 6770 3.4 3.0 113 6.1 6.1 100
Grassy Lake 7265 6.8 7.2 94 10.1 11.1 91
Gros Ventre Summit 8750 2.4 4.3 56 3.3 4.5 73
Gunsight Pass 9820 3.0 3.6 83 5.4 4.5 120
Lewis Lake Divide 7850 5.7 8.3 69 9.8 11.1 88
Phillips Bench 8200 4.6 6.6 70 8.4 8.3 101
Salt River Summit 7640 2.9 2.3 126 5.1 4.9 104
Snake River Station 6920 4.0 3.5 114 8.2 7.4 111
Spring Creek Divide 9000 6.1 5.8 105 7.8 7.3 107
Thumb Divide 7980 1.9 3.6 53 4.7 6.0 78
Togwotee Pass 9580 7.4 7.9 94 8.5 8.0 106
Two Ocean Plateau 9240 8.5 9.4 90 7.4 9.0 82
Willow Creek 8080 7.0 6.5 108 11.4 10.6 108
Younts Peak 8350 -M 4.6 * -M 5.6 *
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Basin Index (%) 96 99
MADISON-GALLATIN
Black Bear 8170 -M 10.2 * -M 11.8 *
Canyon 7870 2.4 3.2 75 4.1 5.4 76
Madison Plateau 7750 3.9 6.1 64 5.1 8.2 62
West Yellowstone 6700 2.1 2.4 88 3.2 4.7 68
Whiskey Creek 6800 1.5 3.8 39 2.3 6.7 34
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Basin Index (%) 64 59
YELLOWSTONE
Beartooth Lake 9360 5.4 6.8 79 4.4 6.2 71
Burnt Mtn 5880 2.2 1.3 169 5.6 5.5 102
Canyon 7870 2.4 3.2 75 4.1 5.4 76
Cole Creek 7850 6.0 4.7 128 5.5 5.2 106
Evening Star 9200 8.2 7.8 105 10.8 9.3 116
Fisher Creek 9100 6.9 9.5 73 10.2 10.2 100
Northeast Entrance 7350 3.0 2.0 150 5.3 4.5 118
Parker Peak 9400 7.5 6.7 112 8.8 6.2 142
Sylvan Lake 8420 7.6 5.9 129 11.8 8.0 148
Thumb Divide 7980 1.9 3.6 53 4.7 6.0 78
Two Ocean Plateau 9240 8.5 9.4 90 7.4 9.0 82
White Mill 8700 5.4 6.7 81 5.0 7.9 63
Wolverine 7650 2.6 2.6 100 4.7 4.5 104
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Basin Index (%) 96 100
WIND RIVER
Burroughs Creek 8750 2.3 -M * 3.3 -M *
Castle Creek 8400 1.1 -M * 2.3 -M *
Cold Springs 9630 2.0 2.4 83 -M 3.9 *
Deer Park 9700 4.3 4.4 98 4.5 6.0 75
Hobbs Park 10100 3.6 4.9 73 3.1 4.8 65
Kirwin 9550 2.5 3.6 69 2.0 4.3 47
Little Warm 9370 1.9 3.3 58 2.5 4.6 54
Owl Creek 8975 2.4 1.8 133 2.9 2.3 126
South Pass 9040 3.3 4.2 79 3.9 5.9 66
St. Lawrence Alt 8620 1.1 2.2 50 3.3 3.4 97
Togwotee Pass 9580 7.4 7.9 94 8.5 8.0 106
Townsend Creek 8700 2.9 2.7 107 3.8 4.5 84
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Basin Index (%) 84 79
BIGHORN BASIN
Bald Mtn. 9380 7.4 6.1 121 5.0 5.6 89
Bear Trap Meadow 8200 3.2 1.7 188 3.3 3.4 97
Bone Springs Div 9350 5.6 5.4 104 4.7 5.3 89
Grave Springs 8550 2.8 2.1 133 3.6 3.9 92
Kirwin 9550 2.5 3.6 69 2.0 4.3 47
Marquette 8760 3.0 -M * 4.0 -M *
Middle Powder 7760 3.4 3.2 106 2.8 4.6 61
Owl Creek 8975 2.4 1.8 133 2.9 2.3 126
Powder River Pass 9480 3.9 3.3 118 3.4 4.4 77
Shell Creek 9580 -M 5.1 * -M 4.9 *
Timber Creek 7950 1.3 1.8 72 3.0 3.3 91
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Basin Index (%) 112 83
SHOSHONE RIVER
Blackwater 9780 8.6 7.5 115 8.9 7.2 124
Evening Star 9200 8.2 7.8 105 10.8 9.3 116
Marquette 8760 3.0 -M * 4.0 -M *
Sylvan Road 7120 4.0 3.2 125 6.9 6.5 106
Younts Peak 8350 -M 4.6 * -M 5.6 *
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Basin Index (%) 112 116
POWDER RIVER
Bear Trap Meadow 8200 3.2 1.7 188 3.3 3.4 97
Cloud Peak Reservoir 9860 5.0 4.1 122 4.6 5.0 92
Grave Springs 8550 2.8 2.1 133 3.6 3.9 92
Hansen Sawmill 8360 1.8 1.8 100 3.5 3.2 109
Middle Powder 7760 3.4 3.2 106 2.8 4.6 61
Powder River Pass 9480 3.9 3.3 118 3.4 4.4 77
Soldier Park 8720 1.3 -M * 3.2 -M *
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Basin Index (%) 124 87
TONGUE RIVER
Big Goose 7990 2.2 2.7 81 3.7 4.2 88
Bone Springs Div 9350 5.6 5.4 104 4.7 5.3 89
Burgess Junction 7880 2.8 3.3 85 3.7 4.4 84
Dome Lake 8880 2.3 4.0 58 3.5 5.2 67
Little Goose 8870 3.6 -M * 3.6 -M *
Sucker Creek 8880 4.6 3.5 131 4.1 5.0 82
Tie Creek 6870 1.3 .9 144 4.9 4.4 111
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Basin Index (%) 95 86
BELLE FOURCHE
Cole Canyon 5910 1.6 .9 178 3.7 3.8 97
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Basin Index (%) 178 97
CHEYENNE RIVER BASIN
Blind Park 6890 2.3 1.9 121 2.5 4.6 54
North Rapid Creek 6130 1.5 1.7 88 2.4 3.9 62
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Basin Index (%) 106 58
UPPER N. PLATTE
Arapaho Ridge 10960 8.4 6.1 138 9.9 7.5 132
Blackhall Mtn 9820 9.2 -M * 12.5 -M *
Columbine 9160 6.7 5.0 134 9.8 7.7 127
Divide Peak 8880 5.4 5.2 104 8.2 7.3 112
Joe Wright 10120 6.6 6.5 102 12.1 8.7 139
Laprele Creek 8375 4.3 2.4 179 5.5 4.3 128
Med Bow 10500 13.9 -M * 15.0 -M *
North French Creek 10130 11.2 7.8 144 13.2 8.4 157
Never Summer 10280 7.3 5.6 130 8.0 -M *
Old Battle 10000 10.9 8.5 128 13.2 11.0 120
Rawah 9020 3.2 2.9 110 6.0 5.3 113
Sage Creek Basin 7850 3.8 2.7 141 6.4 4.9 131
Sand Lake 10050 9.7 7.8 124 8.7 8.0 109
South Brush Creek 8440 4.0 3.0 133 5.0 5.2 96
Tower 10500 14.5 12.4 117 14.0 12.6 111
Webber Springs 9250 6.8 5.6 121 10.6 8.4 126
Willow Creek Pass 9540 5.4 3.8 142 7.2 4.8 150
Zirkel 9340 8.2 5.2 158 12.7 9.0 141
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Basin Index (%) 129 126
SWEETWATER
Deer Park 9700 4.3 4.4 98 4.5 6.0 75
Larsen Creek 9000 2.1 2.9 72 4.9 -M *
South Pass 9040 3.3 4.2 79 3.9 5.9 66
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Basin Index (%) 84 71
LOWER N. PLATTE
Casper Mtn. 7900 4.3 3.8 113 4.5 5.7 79
Laprele Creek 8375 4.3 2.4 179 5.5 4.3 128
Reno Hill 8400 4.7 4.0 118 5.5 5.3 104
Windy Peak 7900 3.9 1.9 205 3.9 3.8 103
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Basin Index (%) 142 102
LARAMIE RIVER
Brooklyn Lake 10240 8.0 4.7 170 9.7 6.3 154
Cinnabar Park 9574 8.0 5.8 138 10.3 7.5 137
Crow Creek 8330 1.5 2.6 58 4.1 3.9 105
Deadman Hill 10220 6.4 5.0 128 6.7 5.7 118
Rawah 9020 3.2 2.9 110 6.0 5.3 113
Roach 9700 4.9 4.4 111 6.9 6.1 113
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Basin Index (%) 126 126
S. PLATTE
Black Mountain 8920 2.8 -M * 4.0 -M *
Crow Creek 8330 1.5 2.6 58 4.1 3.9 105
Deadman Hill 10220 6.4 5.0 128 6.7 5.7 118
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Basin Index (%) 104 112
LITTLE SNAKE RIVER
Battle Mountain 7440 4.0 1.9 211 6.1 5.0 122
Divide Peak 8880 5.4 5.2 104 8.2 7.3 112
Elk River 8700 4.8 3.5 137 5.6 6.2 90
Little Snake River 8915 7.8 4.2 186 14.9 9.7 154
Old Battle 10000 10.9 8.5 128 13.2 11.0 120
Sage Creek Basin 7850 3.8 2.7 141 6.4 4.9 131
Sandstone RS 8150 5.2 2.5 208 6.8 5.8 117
Whiskey Park 8950 8.0 5.6 143 11.9 8.1 147
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Basin Index (%) 146 126
UPPER GREEN RIVER
Big Sandy Opening 9080 3.5 3.8 92 4.8 4.4 109
Blind Bull Sum 8650 5.2 5.9 88 5.4 6.4 84
East Rim Divide 7930 2.3 2.2 105 3.7 3.8 97
Elkhart Park G.S. 9400 3.7 3.7 100 5.1 4.5 113
Gros Ventre Summit 8750 2.4 4.3 56 3.3 4.5 73
Gunsight Pass 9820 3.0 3.6 83 5.4 4.5 120
Kendall R.S. 7740 2.4 2.9 83 3.9 4.4 89
Loomis Park 8240 4.0 3.6 111 5.6 5.4 104
New Fork Lake 8340 2.6 2.5 104 3.6 3.6 100
Pocket Creek 9360 5.3 -M * 6.1 -M *
Snyder Basin 8060 3.1 2.9 107 5.3 4.4 120
Spring Creek Divide 9000 6.1 5.8 105 7.8 7.3 107
Triple Peak 8500 6.4 5.4 119 8.5 7.5 113
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Basin Index (%) 96 103
LOWER GREEN RIVER
Blacks Fork Jct 8869 2.3 -M * 4.7 -M *
Buck Pasture 9632 4.5 -M * 7.7 -M *
EF Blacks Fork GS 9360 3.1 -M * 4.5 -M *
Hams Fork 7840 2.9 2.6 112 4.6 3.6 128
Hewinta 9500 2.5 2.1 119 5.5 4.9 112
Hickerson Park 9122 2.1 1.6 131 4.9 3.9 126
Hole-in-Rock 9168 1.5 1.8 83 4.6 3.7 124
Indian Creek 9425 5.4 6.5 83 5.4 6.6 82
Kelley R.S. 8180 4.1 3.5 117 5.2 5.6 93
Spirit Lk 10235 4.4 -M * 6.6 -M *
Steel Creek Park 10158 4.5 4.4 102 6.5 5.6 116
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Basin Index (%) 102 108
UPPER BEAR RIVER
Bear River RS 8777 2.4 -M * 5.6 -M *
Bug Lake 7987 3.4 3.8 89 7.9 6.1 130
Burts Miller Ranch 8000 1.1 -M * 3.1 -M *
Chalk Creek #1 9171 4.9 6.4 77 10.2 8.2 124
Hayden Fork 9130 3.7 3.2 116 8.2 6.7 122
Kelley R.S. 8180 4.1 3.5 117 5.2 5.6 93
Lily Lake 9133 3.4 3.2 106 6.3 5.9 107
Monte Cristo 8932 6.2 6.4 97 8.7 7.9 110
Salt River Summit 7640 2.9 2.3 126 5.1 4.9 104
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Basin Index (%) 99 114
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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.
