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 WEDNESDAY: FEBRUARY 28 , 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 15.6 13.4 116 17.0 17.1 99
Black Bear 8170 35.8 29.2 123 33.6 30.6 110
Blind Bull Sum 8650 26.5 17.6 151 16.0 15.9 101
Cottonwood Creek 7670 17.6 16.6 106 19.3 19.5 99
East Rim Divide 7930 9.9 8.0 124 9.8 9.5 103
Grand Targhee 9260 36.8 29.7 124 24.0 24.7 97
Granite Creek 6770 14.9 13.6 110 16.9 16.4 103
Grassy Lake 7265 26.2 25.9 101 29.4 29.3 100
Gros Ventre Summit 8750 10.6 9.6 110 10.8 10.0 108
Gunsight Pass 9820 12.4 10.5 118 12.3 10.8 114
Lewis Lake Divide 7850 32.2 25.1 128 -M 28.6 *
Phillips Bench 8200 19.9 19.5 102 20.9 22.6 92
Salt River Summit 7640 8.3 10.5 79 10.1 13.4 75
Snake River Station 6920 15.6 14.1 111 19.9 18.5 108
Spring Creek Divide 9000 21.1 18.3 115 20.0 19.1 105
Thumb Divide 7980 15.3 12.1 126 15.5 14.5 107
Togwotee Pass 9580 24.9 17.5 142 25.5 19.3 132
Two Ocean Plateau 9240 31.5 21.4 147 20.3 21.5 94
Willow Creek 8080 26.0 22.1 118 28.2 26.7 106
Younts Peak 8350 -M 11.6 * -M 12.6 *
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Basin Index (%) 120 103
MADISON-GALLATIN
Black Bear 8170 35.8 29.2 123 33.6 30.6 110
Canyon 7870 14.8 10.4 142 16.7 13.0 128
Madison Plateau 7750 22.9 17.7 129 22.4 21.1 106
West Yellowstone 6700 11.7 8.9 131 14.6 11.6 126
Whiskey Creek 6800 13.6 12.0 113 15.8 16.2 98
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Basin Index (%) 126 111
YELLOWSTONE
Beartooth Lake 9360 34.3 16.4 209 29.0 15.6 186
Burnt Mtn 5880 6.4 4.0 160 12.4 9.2 135
Canyon 7870 14.8 10.4 142 16.7 13.0 128
Cole Creek 7850 11.4 9.6 119 7.7 9.0 86
Evening Star 9200 34.8 18.9 184 31.0 22.0 141
Fisher Creek 9100 44.9 25.5 176 39.1 25.4 154
Northeast Entrance 7350 12.6 8.0 158 15.5 9.8 158
Parker Peak 9400 28.5 15.9 179 22.6 14.0 161
Sylvan Lake 8420 20.4 15.7 130 21.9 17.9 122
Thumb Divide 7980 15.3 12.1 126 15.5 14.5 107
Two Ocean Plateau 9240 31.5 21.4 147 20.3 21.5 94
White Mill 8700 35.8 18.1 198 26.6 18.8 141
Wolverine 7650 18.8 8.5 221 18.0 9.9 182
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Basin Index (%) 168 138
WIND RIVER
Burroughs Creek 8750 13.9 -M * 15.7 -M *
Castle Creek 8400 7.4 -M * 8.6 -M *
Cold Springs 9630 7.7 5.4 143 8.4 7.4 114
Deer Park 9700 9.1 10.8 84 11.8 15.1 78
Hobbs Park 10100 13.5 9.5 142 11.6 9.4 123
Kirwin 9550 16.4 6.9 238 14.8 8.7 170
Little Warm 9370 12.9 7.8 165 13.4 9.8 137
Owl Creek 8975 3.4 3.9 87 5.2 4.3 121
South Pass 9040 9.2 11.3 81 -M 13.3 *
St. Lawrence Alt 8620 2.8 5.0 56 7.0 6.4 109
Togwotee Pass 9580 24.9 17.5 142 25.5 19.3 132
Townsend Creek 8700 6.0 6.3 95 7.2 8.5 85
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Basin Index (%) 125 118
BIGHORN BASIN
Bald Mtn. 9380 17.3 14.5 119 12.1 13.0 93
Bear Trap Meadow 8200 -M 4.3 * 8.5 6.1 139
Bone Springs Div 9350 15.5 11.7 132 11.6 11.7 99
Grave Springs 8550 5.3 6.7 79 4.4 7.8 56
Kirwin 9550 16.4 6.9 238 14.8 8.7 170
Marquette 8760 4.3 -M * 8.0 -M *
Middle Powder 7760 6.9 7.9 87 -M 8.7 *
Owl Creek 8975 3.4 3.9 87 5.2 4.3 121
Powder River Pass 9480 14.1 7.9 178 12.8 9.5 135
Shell Creek 9580 17.4 11.4 153 13.3 10.5 127
Timber Creek 7950 2.7 3.4 79 -M 5.2 *
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Basin Index (%) 133 116
SHOSHONE RIVER
Blackwater 9780 28.7 17.0 169 26.7 16.0 167
Evening Star 9200 34.8 18.9 184 31.0 22.0 141
Marquette 8760 4.3 -M * 8.0 -M *
Sylvan Road 7120 12.9 9.3 139 18.1 13.8 131
Younts Peak 8350 -M 11.6 * -M 12.6 *
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Basin Index (%) 169 146
POWDER RIVER
Bear Trap Meadow 8200 -M 4.3 * 8.5 6.1 139
Cloud Peak Reservoir 9860 12.7 10.3 123 11.2 9.5 118
Grave Springs 8550 5.3 6.7 79 4.4 7.8 56
Hansen Sawmill 8360 6.6 4.6 143 8.0 6.0 133
Middle Powder 7760 6.9 7.9 87 -M 8.7 *
Powder River Pass 9480 14.1 7.9 178 12.8 9.5 135
Soldier Park 8720 5.4 -M * 7.6 -M *
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Basin Index (%) 122 115
TONGUE RIVER
Big Goose 7990 6.0 6.1 98 6.5 7.7 84
Bone Springs Div 9350 15.5 11.7 132 11.6 11.7 99
Burgess Junction 7880 7.4 8.2 90 6.7 8.9 75
Dome Lake 8880 11.9 8.5 140 9.3 9.9 94
Little Goose 8870 7.3 -M * 9.3 -M *
Sucker Creek 8880 8.3 8.8 94 6.3 10.5 60
Tie Creek 6870 3.5 4.2 83 6.8 8.2 83
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Basin Index (%) 111 83
BELLE FOURCHE
Cole Canyon 5910 5.4 5.0 108 7.5 7.0 107
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Basin Index (%) 108 107
CHEYENNE RIVER BASIN
Blind Park 6890 6.9 6.4 108 9.3 9.3 100
North Rapid Creek 6130 6.4 5.8 110 6.8 7.5 91
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Basin Index (%) 109 96
UPPER N. PLATTE
Arapaho Ridge 10960 16.0 16.4 98 15.7 17.5 90
Blackhall Mtn 9820 22.2 -M * 21.8 -M *
Columbine 9160 18.3 19.6 93 19.0 20.2 94
Divide Peak 8880 10.9 15.5 70 14.6 16.7 87
Joe Wright 10120 13.3 16.4 81 22.1 19.8 112
Laprele Creek 8375 5.3 7.7 69 6.8 9.2 74
Med Bow 10500 32.6 -M * 27.0 -M *
North French Creek 10130 21.8 20.9 104 21.6 20.9 103
Never Summer 10280 14.5 16.0 91 11.6 -M *
Old Battle 10000 20.5 23.8 86 19.8 27.7 71
Rawah 9020 9.0 8.6 105 12.2 10.8 113
Sage Creek Basin 7850 7.5 10.5 71 8.2 11.6 71
Sand Lake 10050 21.1 21.0 100 17.7 18.7 95
South Brush Creek 8440 7.9 10.1 78 9.5 11.7 81
Tower 10500 27.1 35.8 76 24.7 31.6 78
Webber Springs 9250 15.3 18.5 83 17.8 21.0 85
Willow Creek Pass 9540 10.7 9.4 114 11.2 10.2 110
Zirkel 9340 21.4 22.8 94 25.7 23.3 110
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Basin Index (%) 88 91
SWEETWATER
Deer Park 9700 9.1 10.8 84 11.8 15.1 78
Larsen Creek 9000 9.1 9.4 97 9.2 -M *
South Pass 9040 9.2 11.3 81 -M 13.3 *
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Basin Index (%) 87 78*
LOWER N. PLATTE
Casper Mtn. 7900 6.3 10.0 63 5.2 11.0 47
Laprele Creek 8375 5.3 7.7 69 6.8 9.2 74
Reno Hill 8400 7.7 9.8 79 8.7 11.0 79
Windy Peak 7900 5.0 5.7 88 6.5 7.7 84
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Basin Index (%) 73 70
LARAMIE RIVER
Brooklyn Lake 10240 19.8 14.8 134 20.3 15.9 128
Cinnabar Park 9574 18.4 16.9 109 20.6 19.6 105
Crow Creek 8330 -M 6.7 * 8.2 7.7 106
Deadman Hill 10220 15.9 12.4 128 15.2 12.6 121
Rawah 9020 9.0 8.6 105 12.2 10.8 113
Roach 9700 11.3 12.3 92 14.2 14.6 97
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Basin Index (%) 114 112
S. PLATTE
Black Mountain 8920 7.5 -M * 10.2 -M *
Crow Creek 8330 -M 6.7 * 8.2 7.7 106
Deadman Hill 10220 15.9 12.4 128 15.2 12.6 121
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Basin Index (%) 128* 115
LITTLE SNAKE RIVER
Battle Mountain 7440 5.4 9.8 55 7.0 12.1 58
Divide Peak 8880 10.9 15.5 70 14.6 16.7 87
Elk River 8700 12.2 15.2 80 13.2 15.8 84
Little Snake River 8915 17.4 19.6 89 22.8 24.9 92
Old Battle 10000 20.5 23.8 86 19.8 27.7 71
Sage Creek Basin 7850 7.5 10.5 71 8.2 11.6 71
Sandstone RS 8150 7.4 10.3 72 6.9 15.0 46
Whiskey Park 8950 18.8 21.2 89 20.7 22.2 93
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Basin Index (%) 80 78
UPPER GREEN RIVER
Big Sandy Opening 9080 10.2 9.9 103 10.2 10.4 98
Blind Bull Sum 8650 26.5 17.6 151 16.0 15.9 101
East Rim Divide 7930 9.9 8.0 124 9.8 9.5 103
Elkhart Park G.S. 9400 9.8 9.3 105 9.4 10.4 90
Gros Ventre Summit 8750 10.6 9.6 110 10.8 10.0 108
Gunsight Pass 9820 12.4 10.5 118 12.3 10.8 114
Kendall R.S. 7740 12.5 9.7 129 12.9 11.6 111
Loomis Park 8240 14.2 11.6 122 15.0 14.0 107
New Fork Lake 8340 9.8 8.1 121 9.0 8.7 103
Pocket Creek 9360 6.9 -M * 6.7 -M *
Snider Basin 8060 10.6 9.5 112 12.4 11.5 108
Spring Creek Divide 9000 21.1 18.3 115 20.0 19.1 105
Triple Peak 8500 23.3 16.6 140 25.2 20.1 125
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Basin Index (%) 123 107
LOWER GREEN RIVER
Blacks Fork Jct 8869 5.6 -M * 7.1 -M *
Buck Pasture 9632 8.6 -M * 9.8 -M *
EF Blacks Fork GS 9360 7.0 -M * 4.6 -M *
Hams Fork 7840 7.5 9.1 82 7.4 9.1 81
Hewinta 9500 6.0 7.8 77 8.6 10.7 80
Hickerson Park 9122 5.7 5.8 98 5.1 7.5 68
Hole-in-Rock 9168 4.9 5.5 89 5.4 7.0 77
Indian Creek 9425 16.7 18.7 89 12.3 17.7 69
Kelley R.S. 8180 10.1 12.0 84 11.5 14.5 79
Spirit Lk 10235 6.4 -M * 7.4 -M *
Steel Creek Park 10158 10.2 11.4 89 10.5 12.3 85
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Basin Index (%) 87 77
UPPER BEAR RIVER
Bear River RS 8777 6.9 -M * 8.3 -M *
Bug Lake 7987 12.5 14.6 86 12.9 15.4 84
Burts Miller Ranch 8000 4.0 -M * 5.1 -M *
Chalk Creek #1 9171 11.0 18.1 61 12.3 19.3 64
Hayden Fork 9130 9.3 11.9 78 11.9 16.3 73
Kelley R.S. 8180 10.1 12.0 84 11.5 14.5 79
Lily Lake 9133 8.0 10.1 79 8.8 13.1 67
Monte Cristo 8932 15.6 20.6 76 15.5 20.4 76
Salt River Summit 7640 8.3 10.5 79 10.1 13.4 75
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Basin Index (%) 76 74
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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.