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 27 , 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 14.6 10.4 140 24.9 22.3 112
Black Bear 8170 47.7 37.0 129 45.4 41.1 110
Blind Bull Sum 8650 37.6 24.1 156 22.0 20.8 106
Cottonwood Creek 7670 19.8 16.7 119 30.1 26.8 112
East Rim Divide 7930 5.9 8.8 67 13.5 12.5 108
Grand Targhee 9260 54.7 43.6 125 37.8 33.6 112
Granite Creek 6770 13.2 9.0 147 24.1 20.8 116
Grassy Lake 7265 31.0 30.0 103 40.0 38.5 104
Gros Ventre Summit 8750 15.5 12.1 128 17.1 14.2 120
Gunsight Pass 9820 18.0 13.3 135 18.9 15.5 122
Lewis Lake Divide 7850 44.1 30.7 144 -M 37.8 *
Phillips Bench 8200 31.3 25.6 122 32.3 30.0 108
Salt River Summit 7640 5.1 8.2 62 14.4 18.0 80
Snake River Station 6920 13.2 9.4 140 26.3 24.2 109
Spring Creek Divide 9000 28.8 24.0 120 27.3 25.6 107
Thumb Divide 7980 17.6 13.9 127 21.5 20.4 105
Togwotee Pass 9580 35.7 24.6 145 37.4 26.6 141
Two Ocean Plateau 9240 43.6 29.3 149 34.0 29.5 115
Willow Creek 8080 35.2 24.9 141 40.9 36.7 111
Younts Peak 8350 -M 15.1 * -M 17.2 *
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Basin Index (%) 130 111
MADISON-GALLATIN
Black Bear 8170 47.7 37.0 129 45.4 41.1 110
Canyon 7870 17.6 11.5 153 21.6 17.6 123
Madison Plateau 7750 29.8 22.2 134 30.5 28.3 108
West Yellowstone 6700 7.1 4.2 169 19.4 15.6 124
Whiskey Creek 6800 15.9 15.4 103 22.4 21.9 102
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Basin Index (%) 131 112
YELLOWSTONE
Beartooth Lake 9360 42.1 23.4 180 39.0 21.4 182
Burnt Mtn 5880 5.1 .0 * 17.4 15.0 116
Canyon 7870 17.6 11.5 153 21.6 17.6 123
Cole Creek 7850 16.8 16.3 103 14.4 15.7 92
Evening Star 9200 44.9 24.6 183 -M 29.7 *
Fisher Creek 9100 57.1 33.2 172 51.9 34.4 151
Northeast Entrance 7350 11.7 4.6 254 20.2 13.4 151
Parker Peak 9400 39.5 21.8 181 33.4 19.6 170
Sylvan Lake 8420 26.5 20.3 131 31.4 24.5 128
Thumb Divide 7980 17.6 13.9 127 21.5 20.4 105
Two Ocean Plateau 9240 43.6 29.3 149 34.0 29.5 115
White Mill 8700 45.3 23.7 191 35.7 25.7 139
Wolverine 7650 20.5 4.8 427 23.5 13.4 175
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Basin Index (%) 171 137
WIND RIVER
Burroughs Creek 8750 14.2 -M * 19.9 -M *
Castle Creek 8400 3.5 -M * 10.9 -M *
Cold Springs 9630 6.0 2.4 250 11.0 11.9 92
Deer Park 9700 11.4 16.3 70 16.7 22.9 73
Hobbs Park 10100 18.1 15.8 115 16.7 16.2 103
Kirwin 9550 19.5 10.2 191 20.2 13.3 152
Little Warm 9370 16.1 9.2 175 19.3 14.7 131
Owl Creek 8975 .4 2.0 20 7.5 7.5 100
South Pass 9040 10.5 15.2 69 -M 19.8 *
St. Lawrence Alt 8620 .0 4.2 0 9.0 11.0 82
Togwotee Pass 9580 35.7 24.6 145 37.4 26.6 141
Townsend Creek 8700 4.4 8.4 52 10.4 14.5 72
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Basin Index (%) 113 107
BIGHORN BASIN
Bald Mtn. 9380 24.3 20.6 118 18.9 19.1 99
Bear Trap Meadow 8200 7.9 1.6 494 12.0 10.1 119
Bone Springs Div 9350 22.6 16.5 137 17.6 17.6 100
Grave Springs 8550 7.8 9.1 86 -M 12.3 *
Kirwin 9550 19.5 10.2 191 20.2 13.3 152
Marquette 8760 6.8 -M * 11.7 -M *
Middle Powder 7760 10.7 12.2 88 -M 13.7 *
Owl Creek 8975 .4 2.0 20 7.5 7.5 100
Powder River Pass 9480 16.2 10.0 162 17.5 14.5 121
Shell Creek 9580 23.5 15.9 148 18.3 15.7 117
Timber Creek 7950 .0 3.6 0 -M 9.3 *
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Basin Index (%) 131 115
SHOSHONE RIVER
Blackwater 9780 37.7 24.7 153 35.6 22.8 156
Evening Star 9200 44.9 24.6 183 -M 29.7 *
Marquette 8760 6.8 -M * 11.7 -M *
Sylvan Road 7120 10.2 7.5 136 24.9 18.1 138
Younts Peak 8350 -M 15.1 * -M 17.2 *
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Basin Index (%) 163 148*
POWDER RIVER
Bear Trap Meadow 8200 7.9 1.6 494 12.0 10.1 119
Cloud Peak Reservoir 9860 17.5 16.5 106 16.8 16.0 105
Grave Springs 8550 7.8 9.1 86 -M 12.3 *
Hansen Sawmill 8360 7.8 3.8 205 12.1 10.3 117
Middle Powder 7760 10.7 12.2 88 -M 13.7 *
Powder River Pass 9480 16.2 10.0 162 17.5 14.5 121
Soldier Park 8720 6.2 -M * 11.7 -M *
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Basin Index (%) 128 115
TONGUE RIVER
Big Goose 7990 9.1 9.1 100 11.1 13.5 82
Bone Springs Div 9350 22.6 16.5 137 17.6 17.6 100
Burgess Junction 7880 11.8 12.3 96 10.8 14.3 76
Dome Lake 8880 15.8 11.7 135 14.9 15.9 94
Little Goose 8870 10.7 -M * 14.9 -M *
Sucker Creek 8880 12.1 12.5 97 11.9 16.7 71
Tie Creek 6870 3.4 3.0 113 11.4 13.7 83
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Basin Index (%) 115 85
BELLE FOURCHE
Cole Canyon 5910 4.8 .4 1200* 12.5 11.2 112
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Basin Index (%) 1200* 112
CHEYENNE RIVER BASIN
Blind Park 6890 4.5 2.7 167 13.5 13.8 98
North Rapid Creek 6130 3.0 2.7 111 10.9 11.8 92
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Basin Index (%) 139 95
UPPER N. PLATTE
Arapaho Ridge 10960 23.9 22.1 108 23.8 25.7 93
Blackhall Mtn 9820 28.1 -M * 30.0 -M *
Columbine 9160 21.5 19.9 108 28.7 27.9 103
Divide Peak 8880 11.1 17.9 62 20.2 23.8 85
Joe Wright 10120 23.0 23.4 98 33.8 29.2 116
Laprele Creek 8375 3.1 7.1 44 9.7 14.6 66
Med Bow 10500 44.9 -M * 37.8 -M *
North French Creek 10130 30.6 32.9 93 31.1 30.0 104
Never Summer 10280 22.4 21.4 105 18.8 -M *
Old Battle 10000 27.5 34.4 80 26.7 38.4 70
Rawah 9020 8.2 7.8 105 17.1 16.8 102
Sage Creek Basin 7850 -M 1.7 * 11.4 15.8 72
Sand Lake 10050 29.9 31.2 96 26.2 28.4 92
South Brush Creek 8440 4.4 10.0 44 13.5 17.4 78
Tower 10500 45.3 49.7 91 -M 43.8 *
Webber Springs 9250 16.4 22.0 75 23.7 29.4 81
Willow Creek Pass 9540 14.6 13.8 106 16.2 15.3 106
Zirkel 9340 21.8 21.9 100 34.4 30.5 113
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Basin Index (%) 91 92
SWEETWATER
Deer Park 9700 11.4 16.3 70 16.7 22.9 73
Larsen Creek 9000 6.2 9.6 65 12.1 -M *
South Pass 9040 10.5 15.2 69 -M 19.8 *
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Basin Index (%) 68 73*
LOWER N. PLATTE
Casper Mtn. 7900 7.4 14.1 52 8.2 17.5 47
Laprele Creek 8375 3.1 7.1 44 9.7 14.6 66
Reno Hill 8400 10.4 13.6 76 13.7 18.3 75
Windy Peak 7900 3.9 5.5 71 10.1 12.6 80
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Basin Index (%) 62 66
LARAMIE RIVER
Brooklyn Lake 10240 26.3 23.0 114 28.4 24.1 118
Cinnabar Park 9574 21.1 20.1 105 27.2 26.4 103
Crow Creek 8330 .0 .0 * 12.4 13.0 95
Deadman Hill 10220 22.6 18.5 122 22.1 20.1 110
Rawah 9020 8.2 7.8 105 17.1 16.8 102
Roach 9700 13.6 17.0 80 19.2 21.7 88
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Basin Index (%) 106 104
S. PLATTE
Black Mountain 8920 9.2 -M * 15.0 -M *
Crow Creek 8330 .0 .0 * 12.4 13.0 95
Deadman Hill 10220 22.6 18.5 122 22.1 20.1 110
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Basin Index (%) 122* 104
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 1.0 0* 12.4 16.8 74
Divide Peak 8880 11.1 17.9 62 20.2 23.8 85
Elk River 8700 10.0 14.3 70 18.7 22.2 84
Little Snake River 8915 18.1 23.1 78 30.5 32.0 95
Old Battle 10000 27.5 34.4 80 26.7 38.4 70
Sage Creek Basin 7850 -M 1.7 * 11.4 15.8 72
Sandstone RS 8150 1.7 7.7 22 11.0 20.3 54
Whiskey Park 8950 22.8 25.7 89 28.6 30.8 93
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Basin Index (%) 73 80
UPPER GREEN RIVER
Big Sandy Opening 9080 11.5 11.8 97 14.1 14.8 95
Blind Bull Sum 8650 37.6 24.1 156 22.0 20.8 106
East Rim Divide 7930 5.9 8.8 67 13.5 12.5 108
Elkhart Park G.S. 9400 11.9 11.8 101 13.2 14.6 90
Gros Ventre Summit 8750 15.5 12.1 128 17.1 14.2 120
Gunsight Pass 9820 18.0 13.3 135 18.9 15.5 122
Kendall R.S. 7740 8.2 5.9 139 16.8 15.1 111
Loomis Park 8240 14.2 11.5 123 20.3 18.5 110
New Fork Lake 8340 6.3 7.1 89 12.6 11.7 108
Pocket Creek 9360 9.1 -M * 10.0 -M *
Snider Basin 8060 4.3 10.0 43 16.0 15.2 105
Spring Creek Divide 9000 28.8 24.0 120 27.3 25.6 107
Triple Peak 8500 32.1 18.8 171 35.2 27.3 129
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Basin Index (%) 122 110
LOWER GREEN RIVER
Blacks Fork Jct 8869 .7 -M * 10.5 -M *
Buck Pasture 9632 9.2 -M * 15.5 -M *
EF Blacks Fork GS 9360 5.6 -M * -M -M *
Hams Fork 7840 1.8 4.4 41 11.6 12.7 91
Hewinta 9500 2.3 6.1 38 12.8 15.7 82
Hickerson Park 9122 .3 5.0 6 9.0 11.7 77
Hole-in-Rock 9168 .9 4.2 21 9.7 11.2 87
Indian Creek 9425 22.0 23.8 92 18.3 24.4 75
Kelley R.S. 8180 10.0 11.8 85 16.2 19.7 82
Spirit Lk 10235 8.6 -M * 13.6 -M *
Steel Creek Park 10158 14.5 16.7 87 16.3 18.6 88
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Basin Index (%) 72 82
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 11.6 -M *
Bug Lake 7987 10.8 16.1 67 18.0 21.1 85
Burts Miller Ranch 8000 .6 -M * 6.7 -M *
Chalk Creek #1 9171 11.0 24.7 45 18.0 27.8 65
Hayden Fork 9130 1.5 10.1 15 18.0 23.2 78
Kelley R.S. 8180 10.0 11.8 85 16.2 19.7 82
Lily Lake 9133 5.4 9.7 56 12.5 19.0 66
Monte Cristo 8932 20.9 27.3 77 24.6 28.5 86
Salt River Summit 7640 5.1 8.2 62 14.4 18.0 80
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Basin Index (%) 60 77
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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.