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: MARCH 20 , 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 17.0 14.7 116 18.7 19.0 98
Black Bear 8170 39.4 32.5 121 36.6 34.5 106
Blind Bull Sum 8650 29.6 20.5 144 17.8 17.6 101
Cottonwood Creek 7670 20.0 19.9 101 22.3 21.9 102
East Rim Divide 7930 11.1 9.6 116 10.9 10.6 103
Grand Targhee 9260 41.8 33.0 127 27.1 27.1 100
Granite Creek 6770 16.4 15.0 109 18.3 18.2 101
Grassy Lake 7265 29.3 29.4 100 32.2 32.7 98
Gros Ventre Summit 8750 13.2 11.6 114 12.7 11.5 110
Gunsight Pass 9820 14.5 12.1 120 14.1 12.1 117
Lewis Lake Divide 7850 34.9 27.7 126 35.5 32.1 111
Phillips Bench 8200 23.4 22.4 104 23.9 25.3 94
Salt River Summit 7640 10.0 12.0 83 11.4 15.0 76
Snake River Station 6920 17.0 15.2 112 21.6 20.4 106
Spring Creek Divide 9000 23.8 21.1 113 22.3 21.5 104
Thumb Divide 7980 17.4 14.1 123 16.9 16.5 102
Togwotee Pass 9580 28.7 20.6 139 29.0 21.8 133
Two Ocean Plateau 9240 34.5 24.0 144 27.2 24.4 111
Willow Creek 8080 30.0 25.4 118 31.2 29.9 104
Younts Peak 8350 -M 13.4 * -M 14.1 *
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Basin Index (%) 119 104
MADISON-GALLATIN
Black Bear 8170 39.4 32.5 121 36.6 34.5 106
Canyon 7870 16.0 11.8 136 18.1 14.6 124
Madison Plateau 7750 25.2 20.1 125 24.7 23.7 104
West Yellowstone 6700 12.9 9.9 130 15.9 12.8 124
Whiskey Creek 6800 15.3 14.2 108 17.4 18.2 96
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Basin Index (%) 123 109
YELLOWSTONE
Beartooth Lake 9360 36.2 19.3 188 31.1 17.7 176
Burnt Mtn 5880 6.7 4.6 146 13.0 10.9 119
Canyon 7870 16.0 11.8 136 18.1 14.6 124
Cole Creek 7850 13.1 12.0 109 8.3 10.7 78
Evening Star 9200 37.2 22.2 168 -M 24.4 *
Fisher Creek 9100 48.1 28.2 171 42.3 28.5 148
Northeast Entrance 7350 13.3 9.0 148 16.5 11.0 150
Parker Peak 9400 30.5 17.6 173 26.7 15.7 170
Sylvan Lake 8420 22.9 18.2 126 24.4 20.0 122
Thumb Divide 7980 17.4 14.1 123 16.9 16.5 102
Two Ocean Plateau 9240 34.5 24.0 144 27.2 24.4 111
White Mill 8700 37.6 19.9 189 28.7 21.2 135
Wolverine 7650 20.0 8.9 225 19.2 11.0 175
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Basin Index (%) 159 135
WIND RIVER
Burroughs Creek 8750 15.1 -M * 16.8 -M *
Castle Creek 8400 7.9 -M * 9.0 -M *
Cold Springs 9630 8.8 6.3 140 9.0 8.6 105
Deer Park 9700 10.6 13.3 80 13.2 17.2 77
Hobbs Park 10100 14.7 11.8 125 12.7 11.1 114
Kirwin 9550 18.0 8.4 214 16.4 10.0 164
Little Warm 9370 14.2 9.2 154 14.7 11.2 131
Owl Creek 8975 3.7 4.6 80 5.4 5.0 108
South Pass 9040 10.3 13.8 75 -M 15.4 *
St. Lawrence Alt 8620 3.0 6.1 49 7.3 7.5 97
Togwotee Pass 9580 28.7 20.6 139 29.0 21.8 133
Townsend Creek 8700 6.3 8.2 77 7.6 10.1 75
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Basin Index (%) 116 112
BIGHORN BASIN
Bald Mtn. 9380 18.6 16.5 113 12.9 14.9 87
Bear Trap Meadow 8200 8.4 5.1 165 8.8 7.1 124
Bone Springs Div 9350 16.7 14.1 118 12.5 13.4 93
Grave Springs 8550 6.0 8.1 74 4.5 9.0 50
Kirwin 9550 18.0 8.4 214 16.4 10.0 164
Marquette 8760 5.1 -M * 8.8 -M *
Middle Powder 7760 7.9 9.8 81 -M 10.0 *
Owl Creek 8975 3.7 4.6 80 5.4 5.0 108
Powder River Pass 9480 14.8 9.2 161 13.6 10.8 126
Shell Creek 9580 18.6 12.8 145 14.0 11.9 118
Timber Creek 7950 2.9 4.2 69 -M 6.1 *
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Basin Index (%) 125 107
SHOSHONE RIVER
Blackwater 9780 31.6 20.8 152 29.3 18.1 162
Evening Star 9200 37.2 22.2 168 -M 24.4 *
Marquette 8760 5.1 -M * 8.8 -M *
Sylvan Road 7120 13.5 10.4 130 19.6 15.1 130
Younts Peak 8350 -M 13.4 * -M 14.1 *
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Basin Index (%) 154 147*
POWDER RIVER
Bear Trap Meadow 8200 8.4 5.1 165 8.8 7.1 124
Cloud Peak Reservoir 9860 13.5 12.9 105 12.0 11.2 107
Grave Springs 8550 6.0 8.1 74 4.5 9.0 50
Hansen Sawmill 8360 6.7 5.7 118 8.1 7.1 114
Middle Powder 7760 7.9 9.8 81 -M 10.0 *
Powder River Pass 9480 14.8 9.2 161 13.6 10.8 126
Soldier Park 8720 5.4 -M * 8.0 -M *
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Basin Index (%) 113 104
TONGUE RIVER
Big Goose 7990 6.5 7.8 83 6.8 9.2 74
Bone Springs Div 9350 16.7 14.1 118 12.5 13.4 93
Burgess Junction 7880 8.1 9.5 85 6.9 10.5 66
Dome Lake 8880 12.9 10.2 126 9.8 11.5 85
Little Goose 8870 7.9 -M * 10.0 -M *
Sucker Creek 8880 8.8 10.9 81 6.6 12.2 54
Tie Creek 6870 3.8 5.0 76 7.3 9.8 74
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Basin Index (%) 99 75
BELLE FOURCHE
Cole Canyon 5910 6.6 5.5 120 8.1 7.9 103
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Basin Index (%) 120 103
CHEYENNE RIVER BASIN
Blind Park 6890 7.1 7.2 99 10.0 10.5 95
North Rapid Creek 6130 6.9 6.5 106 7.4 8.6 86
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Basin Index (%) 102 91
UPPER N. PLATTE
Arapaho Ridge 10960 17.2 18.0 96 16.9 19.7 86
Blackhall Mtn 9820 24.3 -M * 23.8 -M *
Columbine 9160 20.5 22.0 93 20.6 22.9 90
Divide Peak 8880 12.8 17.6 73 16.3 19.1 85
Joe Wright 10120 15.8 19.1 83 25.1 22.9 110
Laprele Creek 8375 5.8 9.1 64 7.1 10.8 66
Med Bow 10500 35.9 -M * 28.8 -M *
North French Creek 10130 24.1 25.2 96 23.6 23.7 100
Never Summer 10280 16.6 17.8 93 13.7 -M *
Old Battle 10000 22.1 26.3 84 21.3 31.4 68
Rawah 9020 9.8 9.4 104 13.2 12.2 108
Sage Creek Basin 7850 8.8 11.5 77 9.5 12.9 74
Sand Lake 10050 23.1 24.6 94 19.5 21.7 90
South Brush Creek 8440 9.2 11.1 83 10.2 13.3 77
Tower 10500 30.2 40.0 76 26.1 35.8 73
Webber Springs 9250 16.6 21.0 79 19.2 23.9 80
Willow Creek Pass 9540 11.9 10.9 109 12.7 11.7 109
Zirkel 9340 24.3 25.7 95 27.7 25.5 109
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Basin Index (%) 87 87
SWEETWATER
Deer Park 9700 10.6 13.3 80 13.2 17.2 77
Larsen Creek 9000 10.3 11.2 92 10.2 -M *
South Pass 9040 10.3 13.8 75 -M 15.4 *
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Basin Index (%) 81 77*
LOWER N. PLATTE
Casper Mtn. 7900 7.3 12.2 60 5.6 12.8 44
Laprele Creek 8375 5.8 9.1 64 7.1 10.8 66
Reno Hill 8400 8.9 11.9 75 9.9 13.0 76
Windy Peak 7900 5.7 7.1 80 7.1 9.1 78
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Basin Index (%) 69 65
LARAMIE RIVER
Brooklyn Lake 10240 21.6 17.7 122 21.9 18.5 118
Cinnabar Park 9574 19.3 18.0 107 22.2 21.4 104
Crow Creek 8330 3.7 6.9 54 9.7 8.9 109
Deadman Hill 10220 18.2 13.9 131 17.4 15.0 116
Rawah 9020 9.8 9.4 104 13.2 12.2 108
Roach 9700 12.2 14.0 87 15.2 16.9 90
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Basin Index (%) 106 107
S. PLATTE
Black Mountain 8920 9.6 -M * 12.2 -M *
Crow Creek 8330 3.7 6.9 54 9.7 8.9 109
Deadman Hill 10220 18.2 13.9 131 17.4 15.0 116
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Basin Index (%) 105 113
LITTLE SNAKE RIVER
Battle Mountain 7440 6.4 11.4 56 9.0 13.6 66
Divide Peak 8880 12.8 17.6 73 16.3 19.1 85
Elk River 8700 13.4 17.4 77 14.1 18.0 78
Little Snake River 8915 18.6 21.1 88 24.3 26.5 92
Old Battle 10000 22.1 26.3 84 21.3 31.4 68
Sage Creek Basin 7850 8.8 11.5 77 9.5 12.9 74
Sandstone RS 8150 8.0 12.2 66 7.5 16.7 45
Whiskey Park 8950 21.1 24.3 87 22.3 25.0 89
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Basin Index (%) 78 76
UPPER GREEN RIVER
Big Sandy Opening 9080 11.7 11.7 100 11.6 11.8 98
Blind Bull Sum 8650 29.6 20.5 144 17.8 17.6 101
East Rim Divide 7930 11.1 9.6 116 10.9 10.6 103
Elkhart Park G.S. 9400 11.2 10.7 105 10.8 11.8 92
Gros Ventre Summit 8750 13.2 11.6 114 12.7 11.5 110
Gunsight Pass 9820 14.5 12.1 120 14.1 12.1 117
Kendall R.S. 7740 13.6 11.3 120 13.9 13.0 107
Loomis Park 8240 16.0 13.3 120 16.6 15.6 106
New Fork Lake 8340 11.1 9.3 119 -M 9.7 *
Pocket Creek 9360 7.9 -M * 7.9 -M *
Snider Basin 8060 12.2 11.0 111 13.7 12.8 107
Spring Creek Divide 9000 23.8 21.1 113 22.3 21.5 104
Triple Peak 8500 26.2 19.5 134 27.9 22.7 123
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Basin Index (%) 120 107
LOWER GREEN RIVER
Blacks Fork Jct 8869 6.9 -M * 8.2 -M *
Buck Pasture 9632 10.7 -M * 11.7 -M *
EF Blacks Fork GS 9360 10.2 -M * -M -M *
Hams Fork 7840 8.6 10.3 83 8.6 10.2 84
Hewinta 9500 7.9 9.9 80 10.3 12.3 84
Hickerson Park 9122 7.6 6.6 115 7.0 8.9 79
Hole-in-Rock 9168 6.9 6.6 105 7.4 8.3 89
Indian Creek 9425 19.5 21.3 92 14.3 20.2 71
Kelley R.S. 8180 12.3 13.4 92 13.4 16.2 83
Spirit Lk 10235 9.2 -M * 10.6 -M *
Steel Creek Park 10158 12.5 13.4 93 12.6 14.3 88
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Basin Index (%) 92 81
UPPER BEAR RIVER
Bear River RS 8777 8.1 -M * 9.6 -M *
Bug Lake 7987 14.2 16.7 85 14.4 17.4 83
Burts Miller Ranch 8000 5.2 -M * 5.8 -M *
Chalk Creek #1 9171 13.5 21.2 64 14.6 22.2 66
Hayden Fork 9130 11.4 14.3 80 14.1 18.6 76
Kelley R.S. 8180 12.3 13.4 92 13.4 16.2 83
Lily Lake 9133 8.4 11.4 74 10.3 15.0 69
Monte Cristo 8932 19.1 24.4 78 18.1 23.1 78
Salt River Summit 7640 10.0 12.0 83 11.4 15.0 76
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Basin Index (%) 78 76
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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.