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 SATURDAY: APRIL 21 , 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 18.0 11.7 154 24.6 21.8 113
Black Bear 8170 43.1 36.9 117 44.8 40.0 112
Blind Bull Sum 8650 37.6 24.1 156 21.9 20.3 108
Cottonwood Creek 7670 23.7 18.3 130 29.8 26.0 115
East Rim Divide 7930 10.8 9.4 115 13.4 12.3 109
Grand Targhee 9260 54.6 42.2 129 32.4 32.8 99
Granite Creek 6770 16.4 10.5 156 24.0 20.4 118
Grassy Lake 7265 34.0 31.1 109 39.4 37.6 105
Gros Ventre Summit 8750 16.8 13.2 127 16.8 13.8 122
Gunsight Pass 9820 19.0 13.7 139 18.4 15.0 123
Lewis Lake Divide 7850 45.3 30.5 149 -M 37.0 *
Phillips Bench 8200 33.1 25.4 130 32.1 29.3 110
Salt River Summit 7640 9.0 9.4 96 14.2 17.4 82
Snake River Station 6920 17.0 11.1 153 26.1 23.6 111
Spring Creek Divide 9000 29.1 23.5 124 27.1 24.9 109
Thumb Divide 7980 20.4 14.4 142 21.2 19.8 107
Togwotee Pass 9580 35.8 24.0 149 36.8 25.8 143
Two Ocean Plateau 9240 42.8 28.3 151 33.5 28.7 117
Willow Creek 8080 38.5 26.7 144 40.4 35.4 114
Younts Peak 8350 -M 15.2 * -M 16.7 *
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Basin Index (%) 135 112
MADISON-GALLATIN
Black Bear 8170 43.1 36.9 117 44.8 40.0 112
Canyon 7870 18.2 12.2 149 21.3 17.1 125
Madison Plateau 7750 29.6 22.9 129 29.7 27.6 108
West Yellowstone 6700 10.8 7.0 154 18.3 15.2 120
Whiskey Creek 6800 16.4 15.4 106 21.7 21.3 102
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Basin Index (%) 125 112
YELLOWSTONE
Beartooth Lake 9360 42.0 23.5 179 38.8 20.8 187
Burnt Mtn 5880 6.2 .0 * 16.2 14.4 112
Canyon 7870 18.2 12.2 149 21.3 17.1 125
Cole Creek 7850 16.5 16.4 101 -M 14.7 *
Evening Star 9200 45.1 24.7 183 -M 28.9 *
Fisher Creek 9100 56.9 32.6 175 51.2 33.5 153
Northeast Entrance 7350 14.3 6.4 223 19.9 13.0 153
Parker Peak 9400 38.0 21.1 180 32.7 18.8 174
Sylvan Lake 8420 28.4 20.4 139 30.7 23.7 130
Thumb Divide 7980 20.4 14.4 142 21.2 19.8 107
Two Ocean Plateau 9240 42.8 28.3 151 33.5 28.7 117
White Mill 8700 45.6 23.7 192 35.3 25.0 141
Wolverine 7650 22.7 6.9 329 23.1 12.9 179
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Basin Index (%) 172 142
WIND RIVER
Burroughs Creek 8750 17.4 -M * 19.7 -M *
Castle Creek 8400 7.0 -M * 10.7 -M *
Cold Springs 9630 8.7 4.3 202 10.9 11.0 99
Deer Park 9700 13.0 16.3 80 16.6 21.7 76
Hobbs Park 10100 18.9 14.9 127 16.4 14.9 110
Kirwin 9550 20.3 10.0 203 19.6 12.5 157
Little Warm 9370 17.4 10.0 174 18.9 14.0 135
Owl Creek 8975 3.7 3.7 100 7.2 6.9 104
South Pass 9040 12.2 15.4 79 -M 18.7 *
St. Lawrence Alt 8620 -M 5.2 * 8.9 10.0 89
Togwotee Pass 9580 35.8 24.0 149 36.8 25.8 143
Townsend Creek 8700 6.8 9.3 73 10.1 13.4 75
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Basin Index (%) 127 112
BIGHORN BASIN
Bald Mtn. 9380 24.4 19.9 123 18.4 18.3 101
Bear Trap Meadow 8200 9.9 2.9 341 11.9 9.5 125
Bone Springs Div 9350 22.4 16.1 139 17.2 16.9 102
Grave Springs 8550 8.2 9.5 86 -M 11.8 *
Kirwin 9550 20.3 10.0 203 19.6 12.5 157
Marquette 8760 7.2 -M * 11.2 -M *
Middle Powder 7760 10.8 12.4 87 -M 12.9 *
Owl Creek 8975 3.7 3.7 100 7.2 6.9 104
Powder River Pass 9480 17.1 10.2 168 17.3 13.8 125
Shell Creek 9580 23.3 15.4 151 18.0 14.9 121
Timber Creek 7950 .4 4.6 9 -M 8.5 *
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Basin Index (%) 134 118
SHOSHONE RIVER
Blackwater 9780 37.7 23.8 158 35.2 21.9 161
Evening Star 9200 45.1 24.7 183 -M 28.9 *
Marquette 8760 7.2 -M * 11.2 -M *
Sylvan Road 7120 14.2 9.5 149 24.6 17.7 139
Younts Peak 8350 -M 15.2 * -M 16.7 *
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Basin Index (%) 167 151*
POWDER RIVER
Bear Trap Meadow 8200 9.9 2.9 341 11.9 9.5 125
Cloud Peak Reservoir 9860 17.8 15.9 112 16.5 15.0 110
Grave Springs 8550 8.2 9.5 86 -M 11.8 *
Hansen Sawmill 8360 9.6 4.6 209 11.8 9.7 122
Middle Powder 7760 10.8 12.4 87 -M 12.9 *
Powder River Pass 9480 17.1 10.2 168 17.3 13.8 125
Soldier Park 8720 7.9 -M * 11.4 -M *
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Basin Index (%) 132 120
TONGUE RIVER
Big Goose 7990 9.6 9.2 104 10.8 12.8 84
Bone Springs Div 9350 22.4 16.1 139 17.2 16.9 102
Burgess Junction 7880 11.8 12.6 94 10.6 13.6 78
Dome Lake 8880 16.7 11.8 142 14.4 15.0 96
Little Goose 8870 11.5 -M * 14.5 -M *
Sucker Creek 8880 12.9 12.7 102 11.5 15.9 72
Tie Creek 6870 5.2 4.2 124 11.0 13.0 85
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Basin Index (%) 118 87
BELLE FOURCHE
Cole Canyon 5910 6.7 1.8 372 12.0 10.5 114
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Basin Index (%) 372 114
CHEYENNE RIVER BASIN
Blind Park 6890 7.0 4.0 175 13.3 13.2 101
North Rapid Creek 6130 5.8 4.0 145 10.5 11.2 94
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Basin Index (%) 160 98
UPPER N. PLATTE
Arapaho Ridge 10960 23.8 21.3 112 23.5 24.4 96
Blackhall Mtn 9820 30.1 -M * 30.0 -M *
Columbine 9160 24.6 20.6 119 28.7 27.0 106
Divide Peak 8880 14.7 18.6 79 20.2 22.9 88
Joe Wright 10120 23.4 22.4 104 33.7 27.9 121
Laprele Creek 8375 5.6 7.8 72 9.5 13.8 69
Med Bow 10500 39.3 -M * 37.7 -M *
North French Creek 10130 31.3 32.0 98 31.0 28.7 108
Never Summer 10280 22.5 20.7 109 18.7 -M *
Old Battle 10000 28.0 32.9 85 26.5 37.2 71
Rawah 9020 10.4 8.3 125 16.9 15.6 108
Sage Creek Basin 7850 2.4 5.4 44 11.5 15.3 75
Sand Lake 10050 30.3 30.6 99 26.0 27.0 96
South Brush Creek 8440 8.0 9.7 82 13.5 16.5 82
Tower 10500 43.5 48.2 90 -M 42.3 *
Webber Springs 9250 18.2 21.8 83 23.7 28.5 83
Willow Creek Pass 9540 14.8 13.3 111 16.0 14.5 110
Zirkel 9340 25.6 22.6 113 34.5 29.8 116
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Basin Index (%) 97 96
SWEETWATER
Deer Park 9700 13.0 16.3 80 16.6 21.7 76
Larsen Creek 9000 10.0 10.2 98 12.1 -M *
South Pass 9040 12.2 15.4 79 -M 18.7 *
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Basin Index (%) 84 76*
LOWER N. PLATTE
Casper Mtn. 7900 8.9 14.4 62 8.0 16.7 48
Laprele Creek 8375 5.6 7.8 72 9.5 13.8 69
Reno Hill 8400 11.3 14.0 81 13.5 17.3 78
Windy Peak 7900 5.8 6.5 89 9.8 11.7 84
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Basin Index (%) 74 69
LARAMIE RIVER
Brooklyn Lake 10240 27.5 22.3 123 28.0 22.9 122
Cinnabar Park 9574 22.4 20.0 112 27.2 25.4 107
Crow Creek 8330 2.0 .3 667* 12.3 12.0 102
Deadman Hill 10220 22.7 17.2 132 21.9 19.0 115
Rawah 9020 10.4 8.3 125 16.9 15.6 108
Roach 9700 14.4 16.6 87 19.0 20.7 92
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Basin Index (%) 117 108
S. PLATTE
Black Mountain 8920 10.1 -M * 14.8 -M *
Crow Creek 8330 2.0 .3 667* 12.3 12.0 102
Deadman Hill 10220 22.7 17.2 132 21.9 19.0 115
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Basin Index (%) 141* 110
LITTLE SNAKE RIVER
Battle Mountain 7440 1.6 3.9 41 12.5 16.1 78
Divide Peak 8880 14.7 18.6 79 20.2 22.9 88
Elk River 8700 13.2 15.2 87 18.6 21.4 87
Little Snake River 8915 21.7 24.1 90 30.7 31.2 98
Old Battle 10000 28.0 32.9 85 26.5 37.2 71
Sage Creek Basin 7850 2.4 5.4 44 11.5 15.3 75
Sandstone RS 8150 6.4 10.0 64 11.0 19.6 56
Whiskey Park 8950 25.7 25.8 100 28.6 29.7 96
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Basin Index (%) 84 83
UPPER GREEN RIVER
Big Sandy Opening 9080 13.5 12.6 107 13.9 14.2 98
Blind Bull Sum 8650 37.6 24.1 156 21.9 20.3 108
East Rim Divide 7930 10.8 9.4 115 13.4 12.3 109
Elkhart Park G.S. 9400 13.3 11.9 112 13.1 14.1 93
Gros Ventre Summit 8750 16.8 13.2 127 16.8 13.8 122
Gunsight Pass 9820 19.0 13.7 139 18.4 15.0 123
Kendall R.S. 7740 12.1 8.1 149 16.8 14.8 114
Loomis Park 8240 17.1 12.8 134 20.2 18.0 112
New Fork Lake 8340 9.8 8.6 114 12.5 11.3 111
Pocket Creek 9360 9.5 -M * 10.0 -M *
Snider Basin 8060 9.5 10.6 90 16.0 14.8 108
Spring Creek Divide 9000 29.1 23.5 124 27.1 24.9 109
Triple Peak 8500 35.7 19.2 186 34.9 26.5 132
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Basin Index (%) 134 112
LOWER GREEN RIVER
Blacks Fork Jct 8869 5.8 -M * 10.5 -M *
Buck Pasture 9632 12.7 -M * 15.4 -M *
EF Blacks Fork GS 9360 10.3 -M * 7.6 -M *
Hams Fork 7840 6.5 6.4 102 11.1 12.1 92
Hewinta 9500 6.8 7.9 86 12.9 15.0 86
Hickerson Park 9122 3.5 5.3 66 9.2 11.1 83
Hole-in-Rock 9168 5.8 5.7 102 9.7 10.6 92
Indian Creek 9425 24.8 23.4 106 17.9 23.7 76
Kelley R.S. 8180 13.3 12.4 107 16.2 19.0 85
Spirit Lk 10235 11.2 -M * 13.6 -M *
Steel Creek Park 10158 15.8 16.2 98 16.3 17.8 92
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Basin Index (%) 99 85
UPPER BEAR RIVER
Bear River RS 8777 1.5 -M * 11.7 -M *
Bug Lake 7987 13.8 16.9 82 17.8 20.5 87
Burts Miller Ranch 8000 .4 -M * 6.7 -M *
Chalk Creek #1 9171 15.4 24.5 63 18.0 26.9 67
Hayden Fork 9130 8.2 11.4 72 18.0 22.5 80
Kelley R.S. 8180 13.3 12.4 107 16.2 19.0 85
Lily Lake 9133 9.3 10.4 89 12.6 18.4 68
Monte Cristo 8932 24.0 27.4 88 24.4 27.5 89
Salt River Summit 7640 9.0 9.4 96 14.2 17.4 82
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Basin Index (%) 83 80
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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.