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: MAY 19 , 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 .0 .0 * 26.4 24.4 108
Black Bear 8170 43.4 34.3 127 48.0 44.6 108
Blind Bull Sum 8650 -M 20.5 * 24.9 23.1 108
Cottonwood Creek 7670 4.6 7.3 63 32.2 29.9 108
East Rim Divide 7930 .0 1.0 0* 16.1 14.1 114
Grand Targhee 9260 47.0 42.8 110 40.9 36.8 111
Granite Creek 6770 .1 .0 * 27.1 22.9 118
Grassy Lake 7265 13.6 18.5 74 41.8 41.8 100
Gros Ventre Summit 8750 6.1 6.3 97 18.8 16.0 118
Gunsight Pass 9820 13.7 10.9 126 21.5 17.7 121
Lewis Lake Divide 7850 27.9 23.1 121 45.5 40.9 111
Phillips Bench 8200 20.9 19.9 105 34.3 32.8 105
Salt River Summit 7640 .0 .0 * 16.1 19.9 81
Snake River Station 6920 .0 .0 * 27.8 26.4 105
Spring Creek Divide 9000 21.4 21.0 102 30.1 28.0 108
Thumb Divide 7980 .0 2.0 0 22.6 22.7 100
Togwotee Pass 9580 30.0 23.2 129 39.8 29.6 134
Two Ocean Plateau 9240 35.5 28.5 125 35.3 32.7 108
Willow Creek 8080 15.0 17.5 86 44.2 40.7 109
Younts Peak 8350 -M 12.1 * -M 19.4 *
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Basin Index (%) 109 109
MADISON-GALLATIN
Black Bear 8170 43.4 34.3 127 48.0 44.6 108
Canyon 7870 5.6 2.8 200 22.4 19.8 113
Madison Plateau 7750 19.6 14.8 132 33.3 31.5 106
West Yellowstone 6700 .0 .0 * 21.2 17.5 121
Whiskey Creek 6800 7.5 6.3 119 24.0 24.2 99
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Basin Index (%) 131 108
YELLOWSTONE
Beartooth Lake 9360 38.2 21.9 174 39.7 24.1 165
Burnt Mtn 5880 .2 .0 * 21.0 19.0 111
Canyon 7870 5.6 2.8 200 22.4 19.8 113
Cole Creek 7850 11.7 16.5 71 19.1 19.4 98
Evening Star 9200 35.4 24.1 147 49.6 33.2 149
Fisher Creek 9100 55.6 33.0 168 52.7 38.2 138
Northeast Entrance 7350 .1 .0 * 21.1 15.4 137
Parker Peak 9400 27.5 20.2 136 34.3 22.3 154
Sylvan Lake 8420 12.9 15.5 83 32.7 27.5 119
Thumb Divide 7980 .0 2.0 0 22.6 22.7 100
Two Ocean Plateau 9240 35.5 28.5 125 35.3 32.7 108
White Mill 8700 38.4 22.8 168 36.0 28.8 125
Wolverine 7650 .1 .0 * 24.1 15.4 156
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Basin Index (%) 139 129
WIND RIVER
Burroughs Creek 8750 .9 -M * 22.0 -M *
Castle Creek 8400 .0 -M * 13.6 -M *
Cold Springs 9630 .0 .0 * 13.7 14.3 96
Deer Park 9700 7.9 11.1 71 20.7 25.9 80
Hobbs Park 10100 13.7 13.6 101 19.5 19.2 102
Kirwin 9550 12.9 8.8 147 22.7 15.8 144
Little Warm 9370 6.5 3.4 191 20.8 17.3 120
Owl Creek 8975 .0 .0 * 10.7 9.5 113
South Pass 9040 1.7 7.7 22 13.0 22.4 58
St. Lawrence Alt 8620 .0 .0 * 11.8 13.4 88
Togwotee Pass 9580 30.0 23.2 129 39.8 29.6 134
Townsend Creek 8700 .0 .0 * 14.3 17.0 84
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Basin Index (%) 107 101
BIGHORN BASIN
Bald Mtn. 9380 17.8 19.6 91 20.5 22.0 93
Bear Trap Meadow 8200 .0 .0 * 13.1 12.5 105
Bone Springs Div 9350 14.8 14.6 101 19.7 20.7 95
Grave Springs 8550 .0 3.5 0 8.3 14.9 56
Kirwin 9550 12.9 8.8 147 22.7 15.8 144
Marquette 8760 .8 -M * 15.3 -M *
Middle Powder 7760 .0 6.2 0 9.1 16.2 56
Owl Creek 8975 .0 .0 * 10.7 9.5 113
Powder River Pass 9480 7.8 6.0 130 19.1 17.2 111
Shell Creek 9580 17.4 15.6 112 19.8 18.4 108
Timber Creek 7950 .0 .0 * 6.6 12.1 55
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Basin Index (%) 95 94
SHOSHONE RIVER
Blackwater 9780 32.2 24.5 131 37.0 25.8 143
Evening Star 9200 35.4 24.1 147 49.6 33.2 149
Marquette 8760 .8 -M * 15.3 -M *
Sylvan Road 7120 .1 .0 * 25.3 20.2 125
Younts Peak 8350 -M 12.1 * -M 19.4 *
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Basin Index (%) 139* 141
POWDER RIVER
Bear Trap Meadow 8200 .0 .0 * 13.1 12.5 105
Cloud Peak Reservoir 9860 11.5 15.2 76 20.1 19.5 103
Grave Springs 8550 .0 3.5 0 8.3 14.9 56
Hansen Sawmill 8360 .0 .0 * 14.6 12.8 114
Middle Powder 7760 .0 6.2 0 9.1 16.2 56
Powder River Pass 9480 7.8 6.0 130 19.1 17.2 111
Soldier Park 8720 .2 -M * 14.0 -M *
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Basin Index (%) 62 91
TONGUE RIVER
Big Goose 7990 .3 5.7 5 12.8 17.1 75
Bone Springs Div 9350 14.8 14.6 101 19.7 20.7 95
Burgess Junction 7880 4.0 8.7 46 12.6 16.9 75
Dome Lake 8880 6.8 7.0 97 18.2 19.0 96
Little Goose 8870 2.0 -M * 16.8 -M *
Sucker Creek 8880 .4 9.2 4 13.6 20.1 68
Tie Creek 6870 .1 .0 * 13.2 17.2 77
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Basin Index (%) 58 81
BELLE FOURCHE
Cole Canyon 5910 .0 .0 * 13.5 14.8 91
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Basin Index (%) * 91
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 15.0 16.6 90
North Rapid Creek 6130 .0 .0 * 13.4 14.4 93
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Basin Index (%) * 92
UPPER N. PLATTE
Arapaho Ridge 10960 13.7 19.0 72 25.4 28.4 89
Blackhall Mtn 9820 12.8 -M * 30.8 -M *
Columbine 9160 .0 4.0 0 29.6 30.5 97
Divide Peak 8880 .0 6.7 0 20.4 26.4 77
Joe Wright 10120 13.7 21.6 63 35.7 32.7 109
Laprele Creek 8375 .1 .0 * 11.0 16.8 65
Med Bow 10500 33.6 -M * 39.2 -M *
North French Creek 10130 19.6 30.2 65 32.1 33.6 96
Never Summer 10280 17.8 20.8 86 20.8 -M *
Old Battle 10000 20.4 32.9 62 27.5 42.0 65
Rawah 9020 .2 .6 33* 18.4 18.9 97
Sage Creek Basin 7850 -M .0 * 11.8 17.3 68
Sand Lake 10050 22.5 28.3 80 27.7 31.8 87
South Brush Creek 8440 .0 .4 0* 13.9 20.0 70
Tower 10500 30.1 48.2 62 42.7 47.7 90
Webber Springs 9250 .8 13.0 6 24.3 32.0 76
Willow Creek Pass 9540 6.1 9.8 62 17.5 17.3 101
Zirkel 9340 -M 11.4 * 35.1 33.3 105
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Basin Index (%) 62 87
SWEETWATER
Deer Park 9700 7.9 11.1 71 20.7 25.9 80
Larsen Creek 9000 .1 3.9 3 14.5 -M *
South Pass 9040 1.7 7.7 22 13.0 22.4 58
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Basin Index (%) 43 70
LOWER N. PLATTE
Casper Mtn. 7900 .0 5.4 0 10.3 20.3 51
Laprele Creek 8375 .1 .0 * 11.0 16.8 65
Reno Hill 8400 .2 4.6 4 15.6 21.3 73
Windy Peak 7900 .2 .0 * 12.7 14.7 86
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Basin Index (%) 5 68
LARAMIE RIVER
Brooklyn Lake 10240 10.8 17.2 63 29.3 27.1 108
Cinnabar Park 9574 6.5 13.1 50 27.9 29.5 95
Crow Creek 8330 .0 .0 * 14.5 15.1 96
Deadman Hill 10220 9.9 17.1 58 23.9 22.9 104
Rawah 9020 .2 .6 33* 18.4 18.9 97
Roach 9700 1.9 12.1 16 20.7 24.5 84
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Basin Index (%) 49 98
S. PLATTE
Black Mountain 8920 -M -M * 16.6 -M *
Crow Creek 8330 .0 .0 * 14.5 15.1 96
Deadman Hill 10220 9.9 17.1 58 23.9 22.9 104
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Basin Index (%) 58* 101
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 13.4 18.6 72
Divide Peak 8880 .0 6.7 0 20.4 26.4 77
Elk River 8700 .0 .0 * 19.1 24.5 78
Little Snake River 8915 .0 14.4 0 31.2 35.0 89
Old Battle 10000 20.4 32.9 62 27.5 42.0 65
Sage Creek Basin 7850 -M .0 * 11.8 17.3 68
Sandstone RS 8150 -M .0 * 11.9 22.4 53
Whiskey Park 8950 4.2 22.6 19 29.2 33.8 86
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Basin Index (%) 32 75
UPPER GREEN RIVER
Big Sandy Opening 9080 -M 4.2 * 16.2 16.8 96
Blind Bull Sum 8650 -M 20.5 * 24.9 23.1 108
East Rim Divide 7930 .0 1.0 0* 16.1 14.1 114
Elkhart Park G.S. 9400 3.6 6.2 58 16.2 16.7 97
Gros Ventre Summit 8750 6.1 6.3 97 18.8 16.0 118
Gunsight Pass 9820 13.7 10.9 126 21.5 17.7 121
Kendall R.S. 7740 .1 .0 * 19.3 16.7 116
Loomis Park 8240 1.4 3.3 42 22.5 20.5 110
New Fork Lake 8340 .0 .0 * 15.1 13.5 112
Pocket Creek 9360 -M -M * 12.1 -M *
Snider Basin 8060 .0 .8 0* 17.8 16.8 106
Spring Creek Divide 9000 21.4 21.0 102 30.1 28.0 108
Triple Peak 8500 14.6 9.5 154 37.7 30.1 125
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Basin Index (%) 103* 111
LOWER GREEN RIVER
Blacks Fork Jct 8869 .0 -M * 12.2 -M *
Buck Pasture 9632 .0 -M * 18.3 -M *
EF Blacks Fork GS 9360 .0 -M * 11.9 -M *
Hams Fork 7840 .0 .0 * 13.5 14.3 94
Hewinta 9500 .0 .0 * 15.3 17.7 86
Hickerson Park 9122 .5 .0 * 12.6 13.4 94
Hole-in-Rock 9168 .0 .0 * 13.0 13.0 100
Indian Creek 9425 13.1 19.3 68 20.4 27.0 76
Kelley R.S. 8180 .0 3.5 0 18.4 21.7 85
Spirit Lk 10235 1.4 -M * 17.0 -M *
Steel Creek Park 10158 9.7 15.2 64 19.4 21.0 92
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Basin Index (%) 61* 88
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 13.6 -M *
Bug Lake 7987 .0 6.1 0 20.0 23.4 85
Burts Miller Ranch 8000 .2 -M * 7.6 -M *
Chalk Creek #1 9171 .0 16.4 0 19.8 30.8 64
Hayden Fork 9130 .2 .0 * 20.1 25.7 78
Kelley R.S. 8180 .0 3.5 0 18.4 21.7 85
Lily Lake 9133 .0 .0 * 14.7 21.3 69
Monte Cristo 8932 8.9 15.8 56 26.8 31.5 85
Salt River Summit 7640 .0 .0 * 16.1 19.9 81
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Basin Index (%) 22* 78
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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.