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 18 , 2019
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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 2.1 .0 * 25.4 24.3 105
Black Bear 8170 39.5 34.8 114 50.9 44.4 115
Blind Bull Sum 8650 25.5 21.0 121 22.3 23.1 97
Cottonwood Creek 7670 9.9 8.2 121 31.5 29.8 106
East Rim Divide 7930 -M 1.8 * -M 14.0 *
Grand Targhee 9260 -M 43.4 * -M 36.7 *
Granite Creek 6770 2.0 .0 * 24.1 22.8 106
Grassy Lake 7265 -M 19.5 * -M 41.7 *
Gros Ventre Summit 8750 .6 7.0 9 15.3 16.0 96
Gunsight Pass 9820 -M 11.4 * -M 17.6 *
Lewis Lake Divide 7850 23.7 23.8 100 44.4 40.8 109
Phillips Bench 8200 -M 20.5 * -M 32.7 *
Salt River Summit 7640 .0 .0 * 19.9 19.8 101
Snake River Station 6920 .0 .0 * 29.4 26.3 112
Spring Creek Divide 9000 20.0 21.5 93 28.0 27.9 100
Thumb Divide 7980 6.2 2.8 221 23.0 22.6 102
Togwotee Pass 9580 23.0 23.5 98 29.9 29.5 101
Two Ocean Plateau 9240 28.2 28.7 98 30.6 32.6 94
Willow Creek 8080 18.4 18.2 101 42.2 40.6 104
Younts Peak 8350 -M 12.5 * -M 19.3 *
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Basin Index (%) 105 104
MADISON-GALLATIN
Black Bear 8170 39.5 34.8 114 50.9 44.4 115
Canyon 7870 5.2 3.5 149 19.6 19.7 99
Madison Plateau 7750 21.2 15.3 139 33.2 31.3 106
West Yellowstone 6700 .0 .0 * 20.7 17.4 119
Whiskey Creek 6800 9.9 6.9 143 24.9 24.1 103
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Basin Index (%) 125 109
YELLOWSTONE
Beartooth Lake 9360 24.3 22.1 110 25.2 24.0 105
Burnt Mtn 5880 .1 .0 * 20.9 18.9 111
Canyon 7870 5.2 3.5 149 19.6 19.7 99
Cole Creek 7850 17.8 16.7 107 -M 19.3 *
Evening Star 9200 25.9 24.5 106 35.9 33.1 108
Fisher Creek 9100 34.1 33.3 102 42.8 38.1 112
Northeast Entrance 7350 .2 .0 * 18.2 15.3 119
Parker Peak 9400 24.0 20.6 117 29.6 22.2 133
Sylvan Lake 8420 13.7 15.9 86 32.3 27.3 118
Thumb Divide 7980 6.2 2.8 221 23.0 22.6 102
Two Ocean Plateau 9240 28.2 28.7 98 30.6 32.6 94
White Mill 8700 24.1 23.2 104 25.6 28.7 89
Wolverine 7650 .0 .0 * 16.7 15.4 108
Younts Peak 8350 -M 12.5 * -M 19.3 *
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Basin Index (%) 107 108
WIND RIVER
Burroughs Creek 8750 -M -M * -M -M *
Castle Creek 8400 .0 -M * 9.5 -M *
Cold Springs 9630 .0 .0 * 12.2 14.3 85
Deer Park 9700 12.3 11.8 104 23.5 25.9 91
Hobbs Park 10100 16.3 14.0 116 17.9 19.1 94
Kirwin 9550 6.1 9.3 66 14.9 15.7 95
Little Warm 9370 2.5 4.2 60 11.0 17.3 64
Owl Creek 8975 .1 .0 * 10.2 9.5 107
South Pass 9040 9.0 8.5 106 17.0 22.3 76
St. Lawrence Alt 8620 -M .0 * -M 13.4 *
Togwotee Pass 9580 23.0 23.5 98 29.9 29.5 101
Townsend Creek 8700 5.3 .2 2650* 16.5 17.0 97
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Basin Index (%) 104 90
BIGHORN BASIN
Bald Mtn. 9380 18.7 20.0 94 17.8 21.9 81
Bear Trap Meadow 8200 .0 .0 * 9.6 12.5 77
Bone Springs Div 9350 13.7 15.0 91 16.2 20.7 78
Grave Springs 8550 1.9 4.4 43 12.1 14.9 81
Kirwin 9550 6.1 9.3 66 14.9 15.7 95
Marquette 8760 5.1 -M * 15.6 -M *
Middle Powder 7760 -M 7.0 * 12.1 16.2 75
Owl Creek 8975 .1 .0 * 10.2 9.5 107
Powder River Pass 9480 2.2 6.8 32 -M 17.1 *
Shell Creek 9580 14.2 15.8 90 14.1 18.4 77
Timber Creek 7950 .1 .0 * 11.0 12.0 92
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Basin Index (%) 80 83
SHOSHONE RIVER
Blackwater 9780 27.1 24.8 109 31.3 25.7 122
Evening Star 9200 25.9 24.5 106 35.9 33.1 108
Marquette 8760 5.1 -M * 15.6 -M *
Sylvan Lake 8420 13.7 15.9 86 32.3 27.3 118
Sylvan Road 7120 .1 .0 * 19.2 20.1 96
Younts Peak 8350 -M 12.5 * -M 19.3 *
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Basin Index (%) 102 112
POWDER RIVER
Bear Trap Meadow 8200 .0 .0 * 9.6 12.5 77
Cloud Peak Reservoir 9860 11.6 15.5 75 15.4 19.4 79
Grave Springs 8550 1.9 4.4 43 12.1 14.9 81
Hansen Sawmill 8360 .2 .0 * 11.4 12.7 90
Middle Powder 7760 -M 7.0 * 12.1 16.2 75
Powder River Pass 9480 2.2 6.8 32 -M 17.1 *
Soldier Park 8720 .1 -M * 10.3 -M *
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Basin Index (%) 60* 80
TONGUE RIVER
Big Goose 7990 5.8 6.6 88 15.5 17.1 91
Bone Springs Div 9350 13.7 15.0 91 16.2 20.7 78
Burgess Junction 7880 5.6 9.3 60 12.6 16.8 75
Dome Lake 8880 5.8 7.8 74 14.2 18.9 75
Little Goose 8870 7.9 -M * 11.8 -M *
Sucker Creek 8880 8.7 9.7 90 15.4 20.0 77
Tie Creek 6870 .1 .0 * 16.4 17.2 95
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Basin Index (%) 82 82
BELLE FOURCHE
Blind Park 6890 .0 .0 * 10.3 16.5 62
Cole Canyon 5910 .0 .0 * 17.5 14.7 119
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Basin Index (%) * 89
CHEYENNE RIVER BASIN
Blind Park 6890 .0 .0 * 10.3 16.5 62
North Rapid Creek 6130 -M .0 * -M 14.3 *
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Basin Index (%) * 62
UPPER N. PLATTE
Arapaho Ridge 10960 23.6 19.8 119 31.4 28.4 111
Blackhall Mtn 9820 29.1 -M * 39.2 -M *
Columbine 9160 8.7 5.2 167 33.3 30.5 109
Divide Peak 8880 6.2 7.7 81 28.2 26.3 107
Joe Wright 10120 20.6 21.9 94 35.6 32.6 109
Laprele Creek 8375 .0 .0 * 17.5 16.8 104
Med Bow 10500 40.3 -M * 42.0 -M *
Never Summer 10280 23.4 21.3 110 23.5 -M *
North French Creek 10130 28.6 30.8 93 35.9 33.5 107
Old Battle 10000 38.6 33.4 116 43.0 41.9 103
Rawah 9020 .3 .7 43* 20.6 18.9 109
Sage Creek Basin 7850 -M .0 * 19.4 17.2 113
Sand Lake 10050 30.2 28.8 105 30.2 31.7 95
South Brush Creek 8440 .0 .4 0* 15.9 19.9 80
Tower 10500 55.5 48.6 114 53.5 47.6 112
Webber Springs 9250 17.4 13.9 125 36.7 31.9 115
Whiskey Park 8950 26.7 23.2 115 38.4 33.7 114
Willow Creek Pass 9540 14.2 10.2 139 21.1 17.2 123
Zirkel 9340 17.5 13.0 135 43.7 33.3 131
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Basin Index (%) 112 109
SWEETWATER
Deer Park 9700 12.3 11.8 104 23.5 25.9 91
Larsen Creek 9000 .0 4.2 0 17.0 -M *
South Pass 9040 9.0 8.5 106 17.0 22.3 76
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Basin Index (%) 87 84
LOWER N. PLATTE
Casper Mtn. 7900 4.0 6.4 62 16.8 20.3 83
Laprele Creek 8375 .0 .0 * 17.5 16.8 104
Reno Hill 8400 8.5 5.6 152 22.0 21.2 104
Windy Peak 7900 .2 .0 * 14.4 14.7 98
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Basin Index (%) 106 97
LARAMIE RIVER
Brooklyn Lake 10240 17.9 18.0 99 31.4 27.0 116
Cinnabar Park 9574 14.1 13.8 102 28.4 29.5 96
Crow Creek 8330 .0 .0 * 14.0 15.0 93
Deadman Hill 10220 17.6 17.6 100 24.4 22.8 107
Rawah 9020 .3 .7 43* 20.6 18.9 109
Roach 9700 10.2 12.6 81 26.8 24.5 109
Windy Peak 7900 .2 .0 * 14.4 14.7 98
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Basin Index (%) 96 105
S. PLATTE
Black Mountain 8920 -M -M * -M -M *
Crow Creek 8330 .0 .0 * 14.0 15.0 93
Deadman Hill 10220 17.6 17.6 100 24.4 22.8 107
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Basin Index (%) 100* 102
LITTLE SNAKE RIVER
Battle Mountain 7440 .0 .0 * 20.5 18.5 111
Divide Peak 8880 6.2 7.7 81 28.2 26.3 107
Elk River 8700 -M .3 * -M 24.5 *
Little Snake River 8915 18.2 15.5 117 43.8 35.0 125
Old Battle 10000 38.6 33.4 116 43.0 41.9 103
Sage Creek Basin 7850 -M .0 * 19.4 17.2 113
Sandstone RS 8150 .0 .0 * 22.4 22.4 100
Whiskey Park 8950 26.7 23.2 115 38.4 33.7 114
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Basin Index (%) 112 111
UPPER GREEN RIVER
Big Sandy Opening 9080 7.7 5.2 148 18.4 16.8 110
Blind Bull Sum 8650 25.5 21.0 121 22.3 23.1 97
East Rim Divide 7930 -M 1.8 * -M 14.0 *
Elkhart Park G.S. 9400 9.3 6.9 135 17.5 16.6 105
Gros Ventre Summit 8750 .6 7.0 9 15.3 16.0 96
Gunsight Pass 9820 -M 11.4 * -M 17.6 *
Indian Creek 9425 17.4 20.0 87 22.3 26.9 83
Kendall R.S. 7740 .0 .0 * 14.7 16.7 88
Loomis Park 8240 4.7 4.0 118 20.8 20.4 102
New Fork Lake 8340 .0 .0 * 13.6 13.5 101
Pocket Creek 9360 10.2 -M * 18.1 -M *
Snider Basin 8060 .0 1.7 0 15.7 16.7 94
Spring Creek Divide 9000 20.0 21.5 93 28.0 27.9 100
Triple Peak 8500 12.3 10.3 119 30.5 30.1 101
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Basin Index (%) 100 98
LOWER GREEN RIVER
Blacks Fork Jct 8869 .0 -M * 16.1 -M *
Buck Pasture 9632 8.1 -M * 24.8 -M *
EF Blacks Fork GS 9360 .0 -M * 15.4 -M *
Hams Fork 7840 -M .0 * -M 14.3 *
Hewinta 9500 .0 .0 * 18.6 17.6 106
Hickerson Park 9122 .2 .0 * 15.0 13.3 113
Hole-in-Rock 9168 .0 .0 * 14.2 12.9 110
Indian Creek 9425 17.4 20.0 87 22.3 26.9 83
Kelley R.S. 8180 3.2 4.3 74 19.7 21.6 91
Spirit Lk 10235 -M -M * -M -M *
Steel Creek Park 10158 14.8 15.5 95 23.4 20.9 112
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Basin Index (%) 89* 100
UPPER BEAR RIVER
Bear River RS 8777 .0 -M * 18.7 -M *
Bug Lake 7987 10.1 7.4 136 28.7 23.3 123
Burts Miller Ranch 8000 -M -M * 10.7 -M *
Chalk Creek #1 9171 17.5 17.2 102 34.8 30.7 113
Hayden Fork 9130 .2 .4 50* 28.1 25.6 110
Kelley R.S. 8180 3.2 4.3 74 19.7 21.6 91
Lily Lake 9133 1.7 .0 * 20.2 21.2 95
Monte Cristo 8932 26.1 16.7 156 38.5 31.4 123
Salt River Summit 7640 .0 .0 * 19.9 19.8 101
Spring Creek Divide 9000 20.0 21.5 93 28.0 27.9 100
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Basin Index (%) 117 108
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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.
