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 FRIDAY: APRIL 17 , 2020
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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 17.3 12.5 138 20.0 21.5 93
Black Bear 8170 -M 36.8 * -M 39.3 *
Blind Bull Sum 8650 28.1 23.9 118 17.2 20.0 86
Cottonwood Creek 7670 26.6 19.3 138 30.9 25.3 122
East Rim Divide 7930 12.0 9.7 124 11.2 12.1 93
Grand Targhee 9260 45.5 41.5 110 29.3 32.3 91
Granite Creek 6770 18.7 11.7 160 -M 20.1 *
Grassy Lake 7265 34.4 31.6 109 35.5 36.9 96
Gros Ventre Summit 8750 13.5 13.1 103 13.7 13.5 101
Gunsight Pass 9820 14.4 13.4 107 14.5 14.6 99
Lewis Lake Divide 7850 29.3 30.2 97 33.3 36.4 91
Phillips Bench 8200 -M 25.9 * -M 28.8 *
Salt River Summit 7640 15.3 10.6 144 16.9 17.1 99
Snake River Station 6920 18.0 12.1 149 22.9 23.2 99
Spring Creek Divide 9000 28.2 23.4 121 26.3 24.4 108
Thumb Divide 7980 18.5 14.4 128 17.9 19.3 93
Togwotee Pass 9580 29.5 23.3 127 29.0 25.2 115
Two Ocean Plateau 9240 33.8 27.6 122 27.8 28.1 99
Willow Creek 8080 40.0 26.7 150 37.6 34.7 108
Younts Peak 8350 18.8 14.9 126 15.4 16.4 94
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Basin Index (%) 123 100
MADISON-GALLATIN
Black Bear 8170 -M 36.8 * -M 39.3 *
Canyon 7870 15.6 12.4 126 16.0 16.8 95
Madison Plateau 7750 23.2 22.7 102 20.6 27.1 76
West Yellowstone 6700 9.6 8.1 119 9.6 14.7 65
Whiskey Creek 6800 16.2 14.9 109 18.3 20.9 88
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Basin Index (%) 111 81
YELLOWSTONE
Beartooth Lake 9360 24.9 22.8 109 23.2 20.4 114
Burnt Mtn 5880 9.7 .0 * 16.2 13.7 118
Canyon 7870 15.6 12.4 126 16.0 16.8 95
Cole Creek 7850 20.5 15.9 129 15.7 14.2 111
Evening Star 9200 29.7 25.0 119 32.1 28.3 113
Fisher Creek 9100 34.4 32.1 107 35.0 32.9 106
Northeast Entrance 7350 10.4 7.6 137 13.4 12.7 106
Parker Peak 9400 -M 20.7 * -M 18.4 *
Sylvan Lake 8420 23.7 20.2 117 25.6 23.2 110
Thumb Divide 7980 18.5 14.4 128 17.9 19.3 93
Two Ocean Plateau 9240 33.8 27.6 122 27.8 28.1 99
White Mill 8700 28.1 23.6 119 23.3 24.6 95
Wolverine 7650 13.1 8.1 162 14.1 12.6 112
Younts Peak 8350 18.8 14.9 126 15.4 16.4 94
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Basin Index (%) 125 105
WIND RIVER
Burroughs Creek 8750 14.5 -M * 15.0 -M *
Castle Creek 8400 6.0 -M * 7.9 -M *
Cold Springs 9630 8.5 5.4 157 8.8 10.6 83
Deer Park 9700 16.1 16.0 101 15.5 21.0 74
Hobbs Park 10100 15.8 14.8 107 14.1 14.4 98
Kirwin 9550 12.6 10.0 126 11.9 12.2 98
Little Warm 9370 13.3 10.2 130 10.6 13.6 78
Owl Creek 8975 7.3 4.7 155 8.4 6.6 127
South Pass 9040 13.6 15.7 87 13.1 18.2 72
St. Lawrence Alt 8620 5.9 6.0 98 9.0 9.6 94
Togwotee Pass 9580 29.5 23.3 127 29.0 25.2 115
Townsend Creek 8700 11.3 9.8 115 12.1 12.9 94
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Basin Index (%) 116 92
BIGHORN BASIN
Bald Mtn. 9380 21.8 19.5 112 16.4 17.9 92
Bear Trap Meadow 8200 8.4 4.0 210 10.0 9.2 109
Bone Springs Div 9350 19.2 16.4 117 15.6 16.4 95
Grave Springs 8550 10.1 9.6 105 10.9 11.3 96
Kirwin 9550 12.6 10.0 126 11.9 12.2 98
Marquette 8760 9.2 -M * 10.6 -M *
Middle Powder 7760 13.4 12.5 107 12.5 12.5 100
Owl Creek 8975 7.3 4.7 155 8.4 6.6 127
Powder River Pass 9480 12.9 10.1 128 13.8 13.4 103
Shell Creek 9580 16.2 15.3 106 14.9 14.5 103
Timber Creek 7950 6.8 5.1 133 8.4 8.1 104
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Basin Index (%) 120 101
SHOSHONE RIVER
Blackwater 9780 25.2 23.7 106 25.2 21.5 117
Evening Star 9200 29.7 25.0 119 32.1 28.3 113
Marquette 8760 9.2 -M * 10.6 -M *
Sylvan Lake 8420 23.7 20.2 117 25.6 23.2 110
Sylvan Road 7120 12.1 10.2 119 -M 17.2 *
Younts Peak 8350 18.8 14.9 126 15.4 16.4 94
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Basin Index (%) 116 110
POWDER RIVER
Bear Trap Meadow 8200 8.4 4.0 210 10.0 9.2 109
Cloud Peak Reservoir 9860 15.9 15.5 103 14.5 14.4 101
Grave Springs 8550 10.1 9.6 105 10.9 11.3 96
Hansen Sawmill 8360 8.2 5.4 152 10.0 9.3 108
Middle Powder 7760 13.4 12.5 107 12.5 12.5 100
Powder River Pass 9480 12.9 10.1 128 13.8 13.4 103
Soldier Park 8720 7.7 -M * 9.8 -M *
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Basin Index (%) 121 102
TONGUE RIVER
Big Goose 7990 9.6 9.6 100 10.9 12.2 89
Bone Springs Div 9350 19.2 16.4 117 15.6 16.4 95
Burgess Junction 7880 12.3 12.2 101 13.1 13.1 100
Dome Lake 8880 14.8 11.9 124 11.0 14.5 76
Little Goose 8870 12.3 -M * 9.3 -M *
Sucker Creek 8880 14.3 12.7 113 13.9 15.4 90
Tie Creek 6870 8.2 4.5 182 13.8 12.4 111
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Basin Index (%) 116 93
BELLE FOURCHE
Blind Park 6890 3.9 4.6 85 8.9 12.5 71
Cole Canyon 5910 -M 2.6 * -M 10.1 *
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Basin Index (%) 85 71
CHEYENNE RIVER BASIN
Blind Park 6890 3.9 4.6 85 8.9 12.5 71
North Rapid Creek 6130 6.2 4.8 129 9.0 10.5 86
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Basin Index (%) 107 78
UPPER N. PLATTE
Arapaho Ridge 10960 23.6 21.5 110 23.5 23.9 98
Blackhall Mtn 9820 32.8 -M * 31.6 -M *
Columbine 9160 28.5 21.2 134 30.3 26.6 114
Divide Peak 8880 21.6 19.6 110 23.0 22.4 103
Joe Wright 10120 23.2 22.1 105 29.1 27.2 107
Laprele Creek 8375 12.0 8.8 136 13.6 13.3 102
Med Bow 10500 45.2 -M * 38.2 -M *
Never Summer 10280 21.6 20.6 105 16.6 -M *
North French Creek 10130 35.2 32.0 110 34.4 28.0 123
Old Battle 10000 34.2 32.3 106 32.1 36.4 88
Rawah 9020 11.2 9.2 122 15.9 15.3 104
Sage Creek Basin 7850 12.5 7.6 164 13.2 15.0 88
Sand Lake 10050 31.5 30.4 104 28.7 26.2 110
South Brush Creek 8440 11.5 10.3 112 14.2 16.1 88
Tower 10500 49.1 47.5 103 44.5 41.4 107
Webber Springs 9250 23.2 22.8 102 27.1 27.9 97
Whiskey Park 8950 34.0 26.5 128 33.5 29.1 115
Willow Creek Pass 9540 15.2 12.7 120 14.3 14.1 101
Zirkel 9340 -M 23.2 * -M 29.5 *
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Basin Index (%) 112 104
SWEETWATER
Deer Park 9700 16.1 16.0 101 15.5 21.0 74
Larsen Creek 9000 7.1 10.6 67 10.4 -M *
South Pass 9040 13.6 15.7 87 13.1 18.2 72
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Basin Index (%) 87 73
LOWER N. PLATTE
Casper Mtn. 7900 17.0 14.4 118 12.5 16.1 78
Laprele Creek 8375 12.0 8.8 136 13.6 13.3 102
Reno Hill 8400 18.0 14.1 128 17.5 16.6 105
Windy Peak 7900 9.6 7.1 135 9.3 11.3 82
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Basin Index (%) 127 92
LARAMIE RIVER
Brooklyn Lake 10240 29.9 22.1 135 29.2 22.3 131
Cinnabar Park 9574 25.1 20.7 121 27.6 25.0 110
Crow Creek 8330 8.2 2.3 357 12.5 11.7 107
Deadman Hill 10220 21.4 16.5 130 19.1 18.4 104
Rawah 9020 11.2 9.2 122 15.9 15.3 104
Roach 9700 16.7 16.5 101 17.9 20.2 89
Windy Peak 7900 9.6 7.1 135 9.3 11.3 82
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Basin Index (%) 129 106
S. PLATTE
Black Mountain 8920 12.7 -M * 15.6 -M *
Crow Creek 8330 8.2 2.3 357 12.5 11.7 107
Deadman Hill 10220 21.4 16.5 130 19.1 18.4 104
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Basin Index (%) 157 105
LITTLE SNAKE RIVER
Battle Mountain 7440 9.1 5.8 157 14.6 15.7 93
Divide Peak 8880 21.6 19.6 110 23.0 22.4 103
Elk River 8700 20.0 16.5 121 19.3 20.9 92
Little Snake River 8915 28.6 25.3 113 34.6 30.9 112
Old Battle 10000 34.2 32.3 106 32.1 36.4 88
Sage Creek Basin 7850 12.5 7.6 164 13.2 15.0 88
Sandstone RS 8150 16.4 11.1 148 17.3 19.1 91
Whiskey Park 8950 34.0 26.5 128 33.5 29.1 115
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Basin Index (%) 122 99
UPPER GREEN RIVER
Big Sandy Opening 9080 11.1 12.8 87 10.0 13.8 72
Blind Bull Sum 8650 28.1 23.9 118 17.2 20.0 86
East Rim Divide 7930 12.0 9.7 124 11.2 12.1 93
Elkhart Park G.S. 9400 10.9 12.0 91 11.0 13.8 80
Gros Ventre Summit 8750 13.5 13.1 103 13.7 13.5 101
Gunsight Pass 9820 14.4 13.4 107 14.5 14.6 99
Indian Creek 9425 24.8 23.5 106 17.6 23.2 76
Kendall R.S. 7740 11.3 9.3 122 12.7 14.6 87
Loomis Park 8240 15.7 13.3 118 19.9 17.7 112
New Fork Lake 8340 10.7 9.3 115 -M 11.1 *
Pocket Creek 9360 -M -M * 9.3 -M *
Snider Basin 8060 12.3 11.3 109 14.6 14.6 100
Spring Creek Divide 9000 28.2 23.4 121 26.3 24.4 108
Triple Peak 8500 29.3 19.3 152 27.4 26.0 105
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Basin Index (%) 114 94
LOWER GREEN RIVER
Blacks Fork Jct 8869 8.2 -M * 13.2 -M *
Buck Pasture 9632 19.1 -M * 19.0 -M *
EF Blacks Fork GS 9360 15.3 -M * 13.1 -M *
Hams Fork 7840 10.8 7.8 138 12.1 11.8 103
Hewinta 9500 13.0 9.1 143 15.9 14.6 109
Hickerson Park 9122 10.5 6.1 172 12.4 10.8 115
Hole-in-Rock 9168 10.4 6.4 162 12.1 10.3 117
Indian Creek 9425 24.8 23.5 106 17.6 23.2 76
Kelley R.S. 8180 15.5 13.4 116 17.0 18.6 91
Spirit Lk 10235 17.9 -M * 19.2 -M *
Steel Creek Park 10158 18.8 16.1 117 19.7 17.4 113
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Basin Index (%) 126 100
UPPER BEAR RIVER
Bear River RS 8777 8.8 -M * 12.5 -M *
Bug Lake 7987 19.2 18.4 104 19.4 20.0 97
Burts Miller Ranch 8000 2.8 -M * 7.7 -M *
Chalk Creek #1 9171 21.8 24.9 88 20.6 26.3 78
Hayden Fork 9130 17.2 13.0 132 22.0 22.0 100
Kelley R.S. 8180 15.5 13.4 116 17.0 18.6 91
Lily Lake 9133 12.8 11.7 109 14.0 17.9 78
Monte Cristo 8932 29.8 27.6 108 26.9 26.9 100
Salt River Summit 7640 15.3 10.6 144 16.9 17.1 99
Spring Creek Divide 9000 28.2 23.4 121 26.3 24.4 108
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Basin Index (%) 112 94
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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.