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 18 , 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 19.2 12.2 157 24.6 21.6 114
Black Bear 8170 43.8 36.8 119 44.7 39.5 113
Blind Bull Sum 8650 37.1 23.9 155 21.9 20.1 109
Cottonwood Creek 7670 24.9 19.1 130 29.6 25.5 116
East Rim Divide 7930 11.9 9.6 124 13.3 12.1 110
Grand Targhee 9260 54.6 41.7 131 32.2 32.3 100
Granite Creek 6770 17.6 11.4 154 23.9 20.2 118
Grassy Lake 7265 34.3 31.5 109 39.3 37.1 106
Gros Ventre Summit 8750 17.4 13.2 132 16.7 13.5 124
Gunsight Pass 9820 19.3 13.5 143 18.4 14.6 126
Lewis Lake Divide 7850 45.0 30.2 149 -M 36.5 *
Phillips Bench 8200 33.1 25.8 128 32.1 28.9 111
Salt River Summit 7640 10.0 10.3 97 14.1 17.2 82
Snake River Station 6920 18.2 11.7 156 26.2 23.3 112
Spring Creek Divide 9000 28.9 23.5 123 26.9 24.6 109
Thumb Divide 7980 21.2 14.5 146 21.3 19.5 109
Togwotee Pass 9580 36.1 23.5 154 36.6 25.4 144
Two Ocean Plateau 9240 42.3 27.8 152 31.1 28.2 110
Willow Creek 8080 38.3 26.8 143 40.3 34.9 115
Younts Peak 8350 -M 15.0 * -M 16.4 *
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Basin Index (%) 136 112
MADISON-GALLATIN
Black Bear 8170 43.8 36.8 119 44.7 39.5 113
Canyon 7870 18.6 12.4 150 21.2 16.8 126
Madison Plateau 7750 29.6 22.8 130 29.7 27.2 109
West Yellowstone 6700 12.2 8.0 152 18.3 14.9 123
Whiskey Creek 6800 16.7 15.1 111 21.7 21.0 103
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Basin Index (%) 127 114
YELLOWSTONE
Beartooth Lake 9360 42.0 23.0 183 38.7 20.5 189
Burnt Mtn 5880 7.5 .0 * 16.0 13.9 115
Canyon 7870 18.6 12.4 150 21.2 16.8 126
Cole Creek 7850 16.8 16.0 105 -M 14.2 *
Evening Star 9200 44.9 25.0 180 -M 28.4 *
Fisher Creek 9100 57.1 32.2 177 50.9 33.0 154
Northeast Entrance 7350 15.5 7.3 212 19.9 12.8 155
Parker Peak 9400 37.7 20.8 181 32.4 18.5 175
Sylvan Lake 8420 28.8 20.3 142 30.6 23.3 131
Thumb Divide 7980 21.2 14.5 146 21.3 19.5 109
Two Ocean Plateau 9240 42.3 27.8 152 31.1 28.2 110
White Mill 8700 45.5 23.6 193 35.2 24.7 143
Wolverine 7650 23.7 7.8 304 23.1 12.7 182
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Basin Index (%) 174 143
WIND RIVER
Burroughs Creek 8750 17.9 -M * 19.5 -M *
Castle Creek 8400 8.0 -M * 10.6 -M *
Cold Springs 9630 9.8 5.1 192 10.6 10.7 99
Deer Park 9700 12.9 16.1 80 16.2 21.1 77
Hobbs Park 10100 18.5 14.8 125 16.0 14.5 110
Kirwin 9550 21.0 10.0 210 19.5 12.2 160
Little Warm 9370 17.8 10.2 175 18.8 13.7 137
Owl Creek 8975 4.4 4.4 100 7.1 6.6 108
South Pass 9040 12.1 15.7 77 -M 18.3 *
St. Lawrence Alt 8620 -M 5.7 * 8.8 9.7 91
Togwotee Pass 9580 36.1 23.5 154 36.6 25.4 144
Townsend Creek 8700 6.9 9.7 71 9.7 13.0 75
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Basin Index (%) 127 113
BIGHORN BASIN
Bald Mtn. 9380 24.3 19.6 124 18.2 17.9 102
Bear Trap Meadow 8200 10.2 3.8 268 11.8 9.2 128
Bone Springs Div 9350 22.4 16.3 137 17.1 16.5 104
Grave Springs 8550 8.3 9.7 86 -M 11.3 *
Kirwin 9550 21.0 10.0 210 19.5 12.2 160
Marquette 8760 7.3 -M * 11.1 -M *
Middle Powder 7760 10.9 12.5 87 -M 12.5 *
Owl Creek 8975 4.4 4.4 100 7.1 6.6 108
Powder River Pass 9480 17.3 10.1 171 17.1 13.5 127
Shell Creek 9580 23.2 15.3 152 17.8 14.6 122
Timber Creek 7950 1.5 5.1 29 -M 8.2 *
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Basin Index (%) 134 120
SHOSHONE RIVER
Blackwater 9780 37.6 23.8 158 35.1 21.6 162
Evening Star 9200 44.9 25.0 180 -M 28.4 *
Marquette 8760 7.3 -M * 11.1 -M *
Sylvan Road 7120 15.3 10.2 150 24.5 17.4 141
Younts Peak 8350 -M 15.0 * -M 16.4 *
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Basin Index (%) 166 153*
POWDER RIVER
Bear Trap Meadow 8200 10.2 3.8 268 11.8 9.2 128
Cloud Peak Reservoir 9860 17.7 15.6 113 16.3 14.5 112
Grave Springs 8550 8.3 9.7 86 -M 11.3 *
Hansen Sawmill 8360 9.6 5.2 185 11.8 9.3 127
Middle Powder 7760 10.9 12.5 87 -M 12.5 *
Powder River Pass 9480 17.3 10.1 171 17.1 13.5 127
Soldier Park 8720 8.5 -M * 11.4 -M *
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Basin Index (%) 130 123
TONGUE RIVER
Big Goose 7990 9.6 9.5 101 10.5 12.3 85
Bone Springs Div 9350 22.4 16.3 137 17.1 16.5 104
Burgess Junction 7880 11.8 12.3 96 10.3 13.2 78
Dome Lake 8880 16.9 11.9 142 14.3 14.6 98
Little Goose 8870 11.7 -M * 14.4 -M *
Sucker Creek 8880 12.9 12.7 102 11.2 15.5 72
Tie Creek 6870 5.3 4.5 118 11.0 12.6 87
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Basin Index (%) 117 88
BELLE FOURCHE
Cole Canyon 5910 7.5 2.4 312 12.0 10.1 119
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Basin Index (%) 312 119
CHEYENNE RIVER BASIN
Blind Park 6890 7.6 4.4 173 13.2 12.6 105
North Rapid Creek 6130 6.5 4.6 141 10.4 10.5 99
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Basin Index (%) 157 102
UPPER N. PLATTE
Arapaho Ridge 10960 22.7 21.4 106 22.7 24.0 95
Blackhall Mtn 9820 29.8 -M * 29.5 -M *
Columbine 9160 24.4 21.0 116 28.0 26.6 105
Divide Peak 8880 14.6 19.3 76 19.7 22.5 88
Joe Wright 10120 23.2 22.1 105 33.2 27.4 121
Laprele Creek 8375 6.4 8.6 74 9.3 13.4 69
Med Bow 10500 39.5 -M * 37.4 -M *
North French Creek 10130 31.5 32.0 98 30.8 28.1 110
Never Summer 10280 21.7 20.6 105 18.1 -M *
Old Battle 10000 27.8 32.4 86 26.1 36.6 71
Rawah 9020 11.0 8.9 124 16.4 15.5 106
Sage Creek Basin 7850 3.6 7.1 51 11.4 15.1 75
Sand Lake 10050 30.0 30.4 99 25.8 26.4 98
South Brush Creek 8440 9.2 10.1 91 13.3 16.2 82
Tower 10500 43.3 47.7 91 28.0 41.6 67
Webber Springs 9250 18.5 22.6 82 23.4 28.1 83
Willow Creek Pass 9540 14.4 12.8 112 15.5 14.2 109
Zirkel 9340 26.0 23.0 113 34.2 29.5 116
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Basin Index (%) 97 92
SWEETWATER
Deer Park 9700 12.9 16.1 80 16.2 21.1 77
Larsen Creek 9000 10.4 10.5 99 11.9 -M *
South Pass 9040 12.1 15.7 77 -M 18.3 *
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Basin Index (%) 84 77*
LOWER N. PLATTE
Casper Mtn. 7900 8.9 14.5 61 7.7 16.2 48
Laprele Creek 8375 6.4 8.6 74 9.3 13.4 69
Reno Hill 8400 11.1 14.0 79 13.2 16.8 79
Windy Peak 7900 6.3 6.9 91 9.4 11.4 82
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Basin Index (%) 74 69
LARAMIE RIVER
Brooklyn Lake 10240 27.4 22.1 124 27.6 22.4 123
Cinnabar Park 9574 22.2 20.5 108 26.8 25.2 106
Crow Creek 8330 2.7 1.7 159 12.1 11.9 102
Deadman Hill 10220 22.4 16.6 135 21.5 18.6 116
Rawah 9020 11.0 8.9 124 16.4 15.5 106
Roach 9700 14.1 16.5 85 18.4 20.3 91
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Basin Index (%) 116 108
S. PLATTE
Black Mountain 8920 10.2 -M * 14.5 -M *
Crow Creek 8330 2.7 1.7 159 12.1 11.9 102
Deadman Hill 10220 22.4 16.6 135 21.5 18.6 116
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Basin Index (%) 137 110
LITTLE SNAKE RIVER
Battle Mountain 7440 2.8 5.4 52 -M 15.8 *
Divide Peak 8880 14.6 19.3 76 19.7 22.5 88
Elk River 8700 14.1 16.1 88 18.3 21.0 87
Little Snake River 8915 22.0 25.0 88 30.5 31.0 98
Old Battle 10000 27.8 32.4 86 26.1 36.6 71
Sage Creek Basin 7850 3.6 7.1 51 11.4 15.1 75
Sandstone RS 8150 7.3 10.8 68 10.5 19.2 55
Whiskey Park 8950 25.7 26.2 98 28.3 29.3 97
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Basin Index (%) 83 83
UPPER GREEN RIVER
Big Sandy Opening 9080 13.6 12.7 107 13.9 13.9 100
Blind Bull Sum 8650 37.1 23.9 155 21.9 20.1 109
East Rim Divide 7930 11.9 9.6 124 13.3 12.1 110
Elkhart Park G.S. 9400 13.4 12.0 112 12.8 13.9 92
Gros Ventre Summit 8750 17.4 13.2 132 16.7 13.5 124
Gunsight Pass 9820 19.3 13.5 143 18.4 14.6 126
Kendall R.S. 7740 13.6 9.0 151 16.8 14.6 115
Loomis Park 8240 18.4 13.2 139 20.1 17.8 113
New Fork Lake 8340 11.1 9.2 121 12.4 11.2 111
Pocket Creek 9360 9.6 -M * 9.9 -M *
Snider Basin 8060 10.3 11.1 93 15.6 14.6 107
Spring Creek Divide 9000 28.9 23.5 123 26.9 24.6 109
Triple Peak 8500 35.4 19.3 183 34.9 26.1 134
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Basin Index (%) 135 114
LOWER GREEN RIVER
Blacks Fork Jct 8869 5.6 -M * 10.2 -M *
Buck Pasture 9632 12.3 -M * 15.4 -M *
EF Blacks Fork GS 9360 10.1 -M * -M -M *
Hams Fork 7840 7.8 7.5 104 10.4 11.9 87
Hewinta 9500 6.5 8.7 75 12.4 14.8 84
Hickerson Park 9122 3.3 5.8 57 8.1 10.9 74
Hole-in-Rock 9168 5.3 6.2 85 8.8 10.4 85
Indian Creek 9425 24.7 23.3 106 17.5 23.3 75
Kelley R.S. 8180 14.1 13.1 108 16.1 18.7 86
Spirit Lk 10235 10.4 -M * 12.5 -M *
Steel Creek Park 10158 15.5 16.1 96 15.8 17.5 90
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Basin Index (%) 96 83
UPPER BEAR RIVER
Bear River RS 8777 2.7 -M * 11.6 -M *
Bug Lake 7987 14.4 18.0 80 17.7 20.1 88
Burts Miller Ranch 8000 .3 -M * 6.5 -M *
Chalk Creek #1 9171 15.3 24.8 62 18.0 26.4 68
Hayden Fork 9130 9.3 12.6 74 17.9 22.1 81
Kelley R.S. 8180 14.1 13.1 108 16.1 18.7 86
Lily Lake 9133 9.4 11.3 83 12.5 18.1 69
Monte Cristo 8932 24.2 27.6 88 24.2 27.0 90
Salt River Summit 7640 10.0 10.3 97 14.1 17.2 82
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Basin Index (%) 82 81
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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.