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: APRIL 29 , 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 14.2 10.0 142 21.1 22.6 93
Black Bear 8170 -M 37.3 * 34.5 41.4 83
Blind Bull Sum 8650 29.5 23.7 124 17.9 21.1 85
Cottonwood Creek 7670 23.8 16.0 149 32.3 27.1 119
East Rim Divide 7930 6.6 8.4 79 11.6 12.7 91
Grand Targhee 9260 47.5 44.1 108 34.0 34.1 100
Granite Creek 6770 15.8 8.6 184 -M 21.1 *
Grassy Lake 7265 30.6 29.7 103 36.3 38.9 93
Gros Ventre Summit 8750 14.1 11.8 119 14.9 14.4 103
Gunsight Pass 9820 15.2 13.0 117 15.8 15.9 99
Lewis Lake Divide 7850 27.0 30.4 89 34.0 38.2 89
Phillips Bench 8200 -M 25.6 * -M 30.3 *
Salt River Summit 7640 10.9 8.1 135 17.5 18.2 96
Snake River Station 6920 13.5 8.4 161 23.5 24.5 96
Spring Creek Divide 9000 28.1 24.3 116 27.0 25.9 104
Thumb Divide 7980 14.9 13.3 112 18.4 20.7 89
Togwotee Pass 9580 29.9 24.7 121 30.0 27.0 111
Two Ocean Plateau 9240 34.6 29.6 117 28.7 29.8 96
Willow Creek 8080 38.5 24.1 160 40.1 37.1 108
Younts Peak 8350 17.0 15.3 111 16.4 17.4 94
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Basin Index (%) 120 97
MADISON-GALLATIN
Black Bear 8170 -M 37.3 * 34.5 41.4 83
Canyon 7870 14.2 11.0 129 16.5 17.8 93
Madison Plateau 7750 20.1 21.9 92 21.0 28.7 73
West Yellowstone 6700 2.1 3.1 68 -M 15.8 *
Whiskey Creek 6800 13.9 15.1 92 18.6 22.1 84
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Basin Index (%) 98 82
YELLOWSTONE
Beartooth Lake 9360 25.6 23.1 111 24.0 21.7 111
Burnt Mtn 5880 4.4 .0 * 15.9 15.4 103
Canyon 7870 14.2 11.0 129 16.5 17.8 93
Cole Creek 7850 19.4 16.4 118 16.0 16.0 100
Evening Star 9200 29.2 24.8 118 33.0 30.1 110
Fisher Creek 9100 35.6 33.0 108 36.3 34.8 104
Northeast Entrance 7350 6.2 4.0 155 14.0 13.6 103
Parker Peak 9400 29.5 21.5 137 26.1 19.8 132
Sylvan Lake 8420 21.0 20.2 104 26.5 24.7 107
Thumb Divide 7980 14.9 13.3 112 18.4 20.7 89
Two Ocean Plateau 9240 34.6 29.6 117 28.7 29.8 96
White Mill 8700 28.8 23.8 121 24.1 26.0 93
Wolverine 7650 9.0 3.6 250 14.6 13.6 107
Younts Peak 8350 17.0 15.3 111 16.4 17.4 94
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Basin Index (%) 121 103
WIND RIVER
Burroughs Creek 8750 11.7 -M * 15.4 -M *
Castle Creek 8400 1.4 -M * 8.2 -M *
Cold Springs 9630 4.8 1.7 282 9.2 12.1 76
Deer Park 9700 13.2 16.2 81 16.0 23.1 69
Hobbs Park 10100 14.9 15.9 94 14.5 16.4 88
Kirwin 9550 12.6 10.3 122 12.5 13.5 93
Little Warm 9370 12.4 9.0 138 11.8 15.1 78
Owl Creek 8975 2.0 1.4 143 8.6 7.7 112
South Pass 9040 11.5 15.1 76 13.4 20.1 67
St. Lawrence Alt 8620 1.4 3.4 41 9.1 11.3 81
Togwotee Pass 9580 29.9 24.7 121 30.0 27.0 111
Townsend Creek 8700 10.0 8.0 125 12.4 14.7 84
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Basin Index (%) 107 85
BIGHORN BASIN
Bald Mtn. 9380 22.8 20.5 111 18.2 19.4 94
Bear Trap Meadow 8200 4.8 1.3 369 10.6 10.3 103
Bone Springs Div 9350 18.7 16.5 113 16.4 17.9 92
Grave Springs 8550 8.9 9.3 96 10.9 12.5 87
Kirwin 9550 12.6 10.3 122 12.5 13.5 93
Marquette 8760 8.8 -M * 11.0 -M *
Middle Powder 7760 12.0 11.9 101 12.7 13.9 91
Owl Creek 8975 2.0 1.4 143 8.6 7.7 112
Powder River Pass 9480 12.0 9.7 124 14.6 14.8 99
Shell Creek 9580 16.7 16.0 104 15.6 16.0 98
Timber Creek 7950 1.6 3.4 47 8.4 9.7 87
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Basin Index (%) 112 95
SHOSHONE RIVER
Blackwater 9780 26.4 25.0 106 26.6 23.1 115
Evening Star 9200 29.2 24.8 118 33.0 30.1 110
Marquette 8760 8.8 -M * 11.0 -M *
Sylvan Lake 8420 21.0 20.2 104 26.5 24.7 107
Sylvan Road 7120 4.2 6.7 63 18.2 18.4 99
Younts Peak 8350 17.0 15.3 111 16.4 17.4 94
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Basin Index (%) 106 106
POWDER RIVER
Bear Trap Meadow 8200 4.8 1.3 369 10.6 10.3 103
Cloud Peak Reservoir 9860 15.2 16.5 92 15.5 16.2 96
Grave Springs 8550 8.9 9.3 96 10.9 12.5 87
Hansen Sawmill 8360 5.9 3.3 179 10.3 10.6 97
Middle Powder 7760 12.0 11.9 101 12.7 13.9 91
Powder River Pass 9480 12.0 9.7 124 14.6 14.8 99
Soldier Park 8720 5.3 -M * 10.4 -M *
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Basin Index (%) 113 95
TONGUE RIVER
Big Goose 7990 9.1 9.2 99 11.1 13.7 81
Bone Springs Div 9350 18.7 16.5 113 16.4 17.9 92
Burgess Junction 7880 12.5 12.1 103 13.6 14.5 94
Dome Lake 8880 13.4 11.6 116 11.6 16.1 72
Little Goose 8870 11.4 -M * -M -M *
Sucker Creek 8880 14.1 12.4 114 15.0 17.0 88
Tie Creek 6870 4.9 2.8 175 14.1 13.9 101
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Basin Index (%) 113 88
BELLE FOURCHE
Blind Park 6890 .0 1.8 0 9.5 14.0 68
Cole Canyon 5910 -M .3 * -M 11.5 *
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Basin Index (%) 0 68
CHEYENNE RIVER BASIN
Blind Park 6890 .0 1.8 0 9.5 14.0 68
North Rapid Creek 6130 2.0 1.8 111 9.5 11.9 80
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Basin Index (%) 56 73
UPPER N. PLATTE
Arapaho Ridge 10960 24.6 22.3 110 25.5 25.9 98
Blackhall Mtn 9820 32.1 -M * 32.7 -M *
Columbine 9160 25.8 19.1 135 32.7 28.2 116
Divide Peak 8880 18.0 18.0 100 24.0 24.0 100
Joe Wright 10120 25.2 23.5 107 30.9 29.5 105
Laprele Creek 8375 9.1 6.7 136 14.4 14.8 97
Med Bow 10500 47.1 -M * 39.5 -M *
Never Summer 10280 23.0 21.6 106 18.4 -M *
North French Creek 10130 36.6 33.0 111 35.8 30.4 118
Old Battle 10000 34.9 34.6 101 33.2 38.8 86
Rawah 9020 9.7 7.0 139 16.7 17.0 98
Sage Creek Basin 7850 7.0 1.2 583* 13.5 16.0 84
Sand Lake 10050 33.4 31.3 107 30.6 28.7 107
South Brush Creek 8440 8.3 9.8 85 14.6 17.6 83
Tower 10500 44.7 49.8 90 47.3 44.3 107
Webber Springs 9250 21.3 22.0 97 28.3 29.7 95
Whiskey Park 8950 31.3 26.1 120 34.4 31.1 111
Willow Creek Pass 9540 15.7 13.9 113 15.7 15.5 101
Zirkel 9340 -M 21.4 * -M 30.7 *
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Basin Index (%) 108 102
SWEETWATER
Deer Park 9700 13.2 16.2 81 16.0 23.1 69
Larsen Creek 9000 .8 9.4 9 10.8 -M *
South Pass 9040 11.5 15.1 76 13.4 20.1 67
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Basin Index (%) 63 68
LOWER N. PLATTE
Casper Mtn. 7900 14.7 14.0 105 13.6 17.7 77
Laprele Creek 8375 9.1 6.7 136 14.4 14.8 97
Reno Hill 8400 17.3 13.1 132 19.7 18.6 106
Windy Peak 7900 6.9 4.7 147 10.5 12.8 82
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Basin Index (%) 125 91
LARAMIE RIVER
Brooklyn Lake 10240 29.9 23.2 129 30.5 24.4 125
Cinnabar Park 9574 23.1 19.9 116 29.1 26.8 109
Crow Creek 8330 2.7 .0 * 13.3 13.3 100
Deadman Hill 10220 21.5 18.8 114 19.7 20.4 97
Rawah 9020 9.7 7.0 139 16.7 17.0 98
Roach 9700 15.1 17.3 87 18.8 22.0 85
Windy Peak 7900 6.9 4.7 147 10.5 12.8 82
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Basin Index (%) 120 101
S. PLATTE
Black Mountain 8920 8.8 -M * 16.3 -M *
Crow Creek 8330 2.7 .0 * 13.3 13.3 100
Deadman Hill 10220 21.5 18.8 114 19.7 20.4 97
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Basin Index (%) 129* 98
LITTLE SNAKE RIVER
Battle Mountain 7440 3.0 .0 * 15.5 17.0 91
Divide Peak 8880 18.0 18.0 100 24.0 24.0 100
Elk River 8700 14.7 13.8 107 19.9 22.4 89
Little Snake River 8915 25.2 22.7 111 35.6 32.4 110
Old Battle 10000 34.9 34.6 101 33.2 38.8 86
Sage Creek Basin 7850 7.0 1.2 583* 13.5 16.0 84
Sandstone RS 8150 10.0 6.7 149 17.5 20.6 85
Whiskey Park 8950 31.3 26.1 120 34.4 31.1 111
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Basin Index (%) 117 96
UPPER GREEN RIVER
Big Sandy Opening 9080 9.4 11.3 83 10.3 15.0 69
Blind Bull Sum 8650 29.5 23.7 124 17.9 21.1 85
East Rim Divide 7930 6.6 8.4 79 11.6 12.7 91
Elkhart Park G.S. 9400 10.3 11.6 89 11.7 14.8 79
Gros Ventre Summit 8750 14.1 11.8 119 14.9 14.4 103
Gunsight Pass 9820 15.2 13.0 117 15.8 15.9 99
Indian Creek 9425 22.4 23.5 95 18.1 24.7 73
Kendall R.S. 7740 7.6 5.2 146 13.6 15.4 88
Loomis Park 8240 13.5 11.3 119 20.9 18.7 112
New Fork Lake 8340 7.5 6.8 110 -M 11.9 *
Pocket Creek 9360 -M -M * 9.6 -M *
Snider Basin 8060 6.4 9.7 66 15.0 15.4 97
Spring Creek Divide 9000 28.1 24.3 116 27.0 25.9 104
Triple Peak 8500 26.4 18.2 145 29.9 27.6 108
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Basin Index (%) 110 93
LOWER GREEN RIVER
Blacks Fork Jct 8869 4.3 -M * 13.4 -M *
Buck Pasture 9632 14.9 -M * 19.3 -M *
EF Blacks Fork GS 9360 10.5 -M * 13.6 -M *
Hams Fork 7840 4.7 3.7 127 12.7 12.9 98
Hewinta 9500 7.5 5.3 142 16.2 15.9 102
Hickerson Park 9122 5.6 4.7 119 12.4 11.8 105
Hole-in-Rock 9168 5.4 3.3 164 12.5 11.3 111
Indian Creek 9425 22.4 23.5 95 18.1 24.7 73
Kelley R.S. 8180 11.7 11.8 99 17.5 19.9 88
Spirit Lk 10235 15.6 -M * 19.3 -M *
Steel Creek Park 10158 17.6 16.9 104 20.0 18.8 106
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Basin Index (%) 108 95
UPPER BEAR RIVER
Bear River RS 8777 1.8 -M * 12.6 -M *
Bug Lake 7987 15.3 15.7 97 19.7 21.4 92
Burts Miller Ranch 8000 .0 -M * 7.8 -M *
Chalk Creek #1 9171 18.2 24.6 74 21.0 28.1 75
Hayden Fork 9130 10.0 9.7 103 22.3 23.5 95
Kelley R.S. 8180 11.7 11.8 99 17.5 19.9 88
Lily Lake 9133 9.3 9.8 95 14.1 19.3 73
Monte Cristo 8932 26.4 27.1 97 28.0 28.9 97
Salt River Summit 7640 10.9 8.1 135 17.5 18.2 96
Spring Creek Divide 9000 28.1 24.3 116 27.0 25.9 104
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Basin Index (%) 99 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.
