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: MARCH 20 , 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 15.4 14.7 105 16.0 19.0 84
Black Bear 8170 30.5 32.5 94 28.5 34.5 83
Blind Bull Sum 8650 22.8 20.5 111 13.7 17.6 78
Cottonwood Creek 7670 24.0 19.9 121 26.1 21.9 119
East Rim Divide 7930 10.9 9.6 114 8.7 10.6 82
Grand Targhee 9260 37.5 33.0 114 26.5 27.1 98
Granite Creek 6770 15.9 15.0 106 14.8 18.2 81
Grassy Lake 7265 29.8 29.4 101 29.5 32.7 90
Gros Ventre Summit 8750 11.1 11.6 96 10.9 11.5 95
Gunsight Pass 9820 11.7 12.1 97 11.8 12.1 98
Lewis Lake Divide 7850 23.2 27.7 84 26.6 32.1 83
Phillips Bench 8200 26.9 22.4 120 26.2 25.3 104
Salt River Summit 7640 13.6 12.0 113 13.8 15.0 92
Snake River Station 6920 15.8 15.2 104 18.7 20.4 92
Spring Creek Divide 9000 23.3 21.1 110 22.0 21.5 102
Thumb Divide 7980 14.4 14.1 102 14.1 16.5 85
Togwotee Pass 9580 25.2 20.6 122 24.2 21.8 111
Two Ocean Plateau 9240 26.9 24.0 112 21.8 24.4 89
Willow Creek 8080 32.5 25.4 128 31.0 29.9 104
Younts Peak 8350 16.1 13.4 120 12.7 14.1 90
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Basin Index (%) 108 93
MADISON-GALLATIN
Black Bear 8170 30.5 32.5 94 28.5 34.5 83
Canyon 7870 13.4 11.8 114 13.6 14.6 93
Madison Plateau 7750 19.3 20.1 96 17.1 23.7 72
West Yellowstone 6700 10.5 9.9 106 8.5 12.8 66
Whiskey Creek 6800 14.1 14.2 99 15.9 18.2 87
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Basin Index (%) 99 81
YELLOWSTONE
Beartooth Lake 9360 20.3 19.3 105 19.0 17.7 107
Burnt Mtn 5880 7.1 4.6 154 11.9 10.9 109
Canyon 7870 13.4 11.8 114 13.6 14.6 93
Cole Creek 7850 15.1 12.0 126 12.0 10.7 112
Evening Star 9200 24.7 22.2 111 26.9 24.4 110
Fisher Creek 9100 29.0 28.2 103 29.7 28.5 104
Northeast Entrance 7350 10.3 9.0 114 11.6 11.0 105
Parker Peak 9400 23.4 17.6 133 21.3 15.7 136
Sylvan Lake 8420 19.2 18.2 105 20.9 20.0 104
Thumb Divide 7980 14.4 14.1 102 14.1 16.5 85
Two Ocean Plateau 9240 26.9 24.0 112 21.8 24.4 89
White Mill 8700 23.8 19.9 120 19.8 21.2 93
Wolverine 7650 11.8 8.9 133 11.8 11.0 107
Younts Peak 8350 16.1 13.4 120 12.7 14.1 90
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Basin Index (%) 114 103
WIND RIVER
Burroughs Creek 8750 11.7 -M * 12.8 -M *
Castle Creek 8400 4.9 -M * 5.8 -M *
Cold Springs 9630 6.7 6.3 106 6.1 8.6 71
Deer Park 9700 11.1 13.3 83 9.7 17.2 56
Hobbs Park 10100 11.7 11.8 99 9.7 11.1 87
Kirwin 9550 10.3 8.4 123 9.0 10.0 90
Little Warm 9370 10.5 9.2 114 8.3 11.2 74
Owl Creek 8975 5.9 4.6 128 6.2 5.0 124
South Pass 9040 9.9 13.8 72 8.4 15.4 55
St. Lawrence Alt 8620 4.6 6.1 75 6.4 7.5 85
Togwotee Pass 9580 25.2 20.6 122 24.2 21.8 111
Townsend Creek 8700 8.0 8.2 98 8.1 10.1 80
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Basin Index (%) 102 82
BIGHORN BASIN
Bald Mtn. 9380 19.4 16.5 118 14.8 14.9 99
Bear Trap Meadow 8200 8.6 5.1 169 8.6 7.1 121
Bone Springs Div 9350 16.1 14.1 114 13.1 13.4 98
Grave Springs 8550 9.4 8.1 116 9.8 9.0 109
Kirwin 9550 10.3 8.4 123 9.0 10.0 90
Marquette 8760 6.3 -M * 8.0 -M *
Middle Powder 7760 11.8 9.8 120 11.2 10.0 112
Owl Creek 8975 5.9 4.6 128 6.2 5.0 124
Powder River Pass 9480 11.6 9.2 126 11.7 10.8 108
Shell Creek 9580 13.7 12.8 107 13.1 11.9 110
Timber Creek 7950 5.5 4.2 131 6.3 6.1 103
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Basin Index (%) 121 106
SHOSHONE RIVER
Blackwater 9780 19.8 20.8 95 20.2 18.1 112
Evening Star 9200 24.7 22.2 111 26.9 24.4 110
Marquette 8760 6.3 -M * 8.0 -M *
Sylvan Lake 8420 19.2 18.2 105 20.9 20.0 104
Sylvan Road 7120 11.2 10.4 108 -M 15.1 *
Younts Peak 8350 16.1 13.4 120 12.7 14.1 90
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Basin Index (%) 107 105
POWDER RIVER
Bear Trap Meadow 8200 8.6 5.1 169 8.6 7.1 121
Cloud Peak Reservoir 9860 13.3 12.9 103 12.1 11.2 108
Grave Springs 8550 9.4 8.1 116 9.8 9.0 109
Hansen Sawmill 8360 6.7 5.7 118 7.7 7.1 108
Middle Powder 7760 11.8 9.8 120 11.2 10.0 112
Powder River Pass 9480 11.6 9.2 126 11.7 10.8 108
Soldier Park 8720 6.1 -M * 7.7 -M *
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Basin Index (%) 121 111
TONGUE RIVER
Big Goose 7990 8.3 7.8 106 9.3 9.2 101
Bone Springs Div 9350 16.1 14.1 114 13.1 13.4 98
Burgess Junction 7880 10.5 9.5 111 11.4 10.5 109
Dome Lake 8880 12.6 10.2 124 8.7 11.5 76
Little Goose 8870 10.1 -M * 7.7 -M *
Sucker Creek 8880 12.6 10.9 116 11.7 12.2 96
Tie Creek 6870 7.8 5.0 156 11.8 9.8 120
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Basin Index (%) 118 99
BELLE FOURCHE
Blind Park 6890 6.3 7.2 88 7.3 10.5 70
Cole Canyon 5910 -M 5.5 * -M 7.9 *
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Basin Index (%) 88 70
CHEYENNE RIVER BASIN
Blind Park 6890 6.3 7.2 88 7.3 10.5 70
North Rapid Creek 6130 7.5 6.5 115 7.7 8.6 90
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Basin Index (%) 101 79
UPPER N. PLATTE
Arapaho Ridge 10960 21.3 18.0 118 20.4 19.7 104
Blackhall Mtn 9820 27.6 -M * 26.6 -M *
Columbine 9160 30.2 22.0 137 27.0 22.9 118
Divide Peak 8880 18.9 17.6 107 19.4 19.1 102
Joe Wright 10120 20.3 19.1 106 24.8 22.9 108
Laprele Creek 8375 11.4 9.1 125 11.5 10.8 106
Med Bow 10500 40.1 -M * 32.2 -M *
Never Summer 10280 18.2 17.8 102 13.6 -M *
North French Creek 10130 30.7 25.2 122 29.6 23.7 125
Old Battle 10000 28.5 26.3 108 26.1 31.4 83
Rawah 9020 11.8 9.4 126 13.6 12.2 111
Sage Creek Basin 7850 14.3 11.5 124 11.0 12.9 85
Sand Lake 10050 26.7 24.6 109 24.5 21.7 113
South Brush Creek 8440 12.5 11.1 113 12.1 13.3 91
Tower 10500 43.0 40.0 108 38.8 35.8 108
Webber Springs 9250 20.5 21.0 98 22.3 23.9 93
Whiskey Park 8950 30.7 24.3 126 29.2 25.0 117
Willow Creek Pass 9540 12.2 10.9 112 11.5 11.7 98
Zirkel 9340 -M 25.7 * -M 25.5 *
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Basin Index (%) 114 105
SWEETWATER
Deer Park 9700 11.1 13.3 83 9.7 17.2 56
Larsen Creek 9000 4.9 11.2 44 6.9 -M *
South Pass 9040 9.9 13.8 72 8.4 15.4 55
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Basin Index (%) 68 56
LOWER N. PLATTE
Casper Mtn. 7900 14.8 12.2 121 9.8 12.8 77
Laprele Creek 8375 11.4 9.1 125 11.5 10.8 106
Reno Hill 8400 15.5 11.9 130 15.6 13.0 120
Windy Peak 7900 9.0 7.1 127 7.9 9.1 87
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Basin Index (%) 126 98
LARAMIE RIVER
Brooklyn Lake 10240 25.3 17.7 143 24.1 18.5 130
Cinnabar Park 9574 22.2 18.0 123 24.1 21.4 113
Crow Creek 8330 7.2 6.9 104 9.9 8.9 111
Deadman Hill 10220 17.4 13.9 125 15.3 15.0 102
Rawah 9020 11.8 9.4 126 13.6 12.2 111
Roach 9700 14.3 14.0 102 14.5 16.9 86
Windy Peak 7900 9.0 7.1 127 7.9 9.1 87
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Basin Index (%) 123 107
S. PLATTE
Black Mountain 8920 9.9 -M * 12.2 -M *
Crow Creek 8330 7.2 6.9 104 9.9 8.9 111
Deadman Hill 10220 17.4 13.9 125 15.3 15.0 102
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Basin Index (%) 118 105
LITTLE SNAKE RIVER
Battle Mountain 7440 11.7 11.4 103 13.0 13.6 96
Divide Peak 8880 18.9 17.6 107 19.4 19.1 102
Elk River 8700 19.2 17.4 110 16.5 18.0 92
Little Snake River 8915 25.6 21.1 121 30.0 26.5 113
Old Battle 10000 28.5 26.3 108 26.1 31.4 83
Sage Creek Basin 7850 14.3 11.5 124 11.0 12.9 85
Sandstone RS 8150 15.6 12.2 128 14.2 16.7 85
Whiskey Park 8950 30.7 24.3 126 29.2 25.0 117
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Basin Index (%) 116 98
UPPER GREEN RIVER
Big Sandy Opening 9080 8.4 11.7 72 7.2 11.8 61
Blind Bull Sum 8650 22.8 20.5 111 13.7 17.6 78
East Rim Divide 7930 10.9 9.6 114 8.7 10.6 82
Elkhart Park G.S. 9400 9.6 10.7 90 9.5 11.8 81
Gros Ventre Summit 8750 11.1 11.6 96 10.9 11.5 95
Gunsight Pass 9820 11.7 12.1 97 11.8 12.1 98
Indian Creek 9425 20.3 21.3 95 14.3 20.2 71
Kendall R.S. 7740 9.5 11.3 84 9.6 13.0 74
Loomis Park 8240 13.3 13.3 100 16.1 15.6 103
New Fork Lake 8340 9.9 9.3 106 -M 9.7 *
Pocket Creek 9360 -M -M * 7.1 -M *
Snider Basin 8060 12.4 11.0 113 12.6 12.8 98
Spring Creek Divide 9000 23.3 21.1 110 22.0 21.5 102
Triple Peak 8500 24.0 19.5 123 23.8 22.7 105
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Basin Index (%) 102 88
LOWER GREEN RIVER
Blacks Fork Jct 8869 7.6 -M * 11.0 -M *
Buck Pasture 9632 16.4 -M * 15.7 -M *
EF Blacks Fork GS 9360 13.3 -M * -M -M *
Hams Fork 7840 11.3 10.3 110 9.9 10.2 97
Hewinta 9500 10.0 9.9 101 13.2 12.3 107
Hickerson Park 9122 10.0 6.6 152 10.6 8.9 119
Hole-in-Rock 9168 10.5 6.6 159 10.3 8.3 124
Indian Creek 9425 20.3 21.3 95 14.3 20.2 71
Kelley R.S. 8180 13.9 13.4 104 14.4 16.2 89
Spirit Lk 10235 16.4 -M * 17.0 -M *
Steel Creek Park 10158 15.7 13.4 117 16.3 14.3 114
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Basin Index (%) 113 98
UPPER BEAR RIVER
Bear River RS 8777 8.5 -M * 9.9 -M *
Bug Lake 7987 16.7 16.7 100 15.9 17.4 91
Burts Miller Ranch 8000 5.4 -M * 6.4 -M *
Chalk Creek #1 9171 18.1 21.2 85 16.7 22.2 75
Hayden Fork 9130 14.5 14.3 101 18.4 18.6 99
Kelley R.S. 8180 13.9 13.4 104 14.4 16.2 89
Lily Lake 9133 10.6 11.4 93 11.1 15.0 74
Monte Cristo 8932 25.6 24.4 105 22.4 23.1 97
Salt River Summit 7640 13.6 12.0 113 13.8 15.0 92
Spring Creek Divide 9000 23.3 21.1 110 22.0 21.5 102
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Basin Index (%) 101 90
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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.