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 MONDAY: MAY 18 , 2009
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BASIN ELEV. SNOW WATER EQUIVALENT TOTAL PRECIPITATION
Data Site Name (Ft) % %
Current Average Avg Current Average Avg
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WYOMING
SNAKE RIVER
BASE CAMP 7030 1.0 5.6 18 24.3 25.8 94
COTTONWOOD CREEK 7670 18.6 13.0 143 38.5 34.1 113
GRAND TARGHEE 9260 45.4 -M * 42.5 -M *
GRANITE CREEK 6770 4.1 7.1 58 25.6 23.7 108
GRASSY LAKE 7265 22.1 25.3 87 43.2 43.1 100
GROS VENTRE SUMMIT 8750 9.1 9.2 99 19.4 16.5 118
GUNSIGHT PASS 9820 16.8 -M * 20.9 -M *
LEWIS LAKE DIVIDE 7850 32.4 27.9 116 42.1 43.7 96
PHILLIPS BENCH 8200 25.2 23.1 109 36.2 35.0 103
SALT RIVER SUMMIT 7760 4.5 3.9 115 20.2 23.0 88
SNAKE RIVER STATION 6920 2.2 4.7 47 28.8 27.1 106
SPRING CREEK DIVIDE 9000 28.4 23.8 119 32.8 31.8 103
THUMB DIVIDE 7980 13.6 8.8 155 27.6 23.6 117
TOGWOTEE PASS 9580 32.1 27.0 119 36.5 31.0 118
TWO OCEAN PLATEAU 9240 47.5 30.3 157 37.8 34.4 110
WILLOW CREEK 8380 28.5 24.2 118 48.5 40.5 120
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Basin wide percent of average 115 107
UPPER YELLOWSTONE-MADISON
BEARTOOTH LAKE 9360 27.0 25.2 107 27.5 25.4 108
BLACK BEAR 8170 40.3 35.8 113 45.3 48.3 94
CANYON 7870 11.1 6.3 176 20.2 19.1 106
FISHER CREEK 9100 44.8 36.0 124 45.1 44.4 102
MADISON PLATEAU 7750 22.1 18.6 119 32.1 32.4 99
NORTHEAST ENTRANCE 7350 .0 2.6 0 17.9 16.2 110
PARKER PEAK 9400 30.6 23.7 129 24.5 21.5 114
SYLVAN LAKE 8420 20.7 19.6 106 30.6 26.9 114
THUMB DIVIDE 7980 13.6 8.8 155 27.6 23.6 117
TWO OCEAN PLATEAU 9240 47.5 30.3 157 37.8 34.4 110
WHISKEY CREEK 6800 13.9 8.7 160 26.6 25.8 103
WHITE MILL 8700 29.3 24.2 121 31.7 33.3 95
WOLVERINE 7650 .5 2.4 21 17.2 16.9 102
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Basin wide percent of average 124 104
WIND RIVER
BURROUGHS CREEK 8750 15.9 9.9 161 21.8 21.1 103
COLD SPRINGS 9630 1.6 2.9 55 15.7 15.7 100
DEER PARK 9700 11.7 16.7 70 23.1 29.1 79
HOBBS PARK 10100 15.9 16.3 98 21.0 19.2 109
LITTLE WARM 9370 8.4 7.1 118 19.8 18.6 106
SOUTH PASS 9040 9.4 13.0 72 20.0 24.7 81
ST. LAWRENCE ALT 8620 .1 3.1 3 14.6 13.9 105
TOGWOTEE PASS 9580 32.1 27.0 119 36.5 31.0 118
TOWNSEND CREEK 8700 3.8 5.2 73 17.3 17.4 99
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Basin wide percent of average 98 100
BIGHORN BASIN
BALD MTN. 9380 21.5 22.7 95 20.0 23.6 85
BEAR TRAP MEADOW 8200 .1 .4 25 12.5 12.7 98
BLACKWATER 9780 33.1 28.7 115 31.0 26.9 115
BONE SPRINGS DIV 9350 17.8 15.7 113 19.0 20.5 93
EVENING STAR 9200 32.1 32.0 100 39.9 32.3 124
GRAVE SPRINGS 8550 5.2 6.7 78 12.5 14.8 84
KIRWIN 9550 12.7 10.6 120 19.9 16.0 124
MARQUETTE 8760 6.4 8.4 76 13.6 16.0 85
MIDDLE POWDER 7760 8.4 10.1 83 13.3 17.7 75
OWL CREEK 8975 .1 2.0 5 10.3 9.7 106
POWDER RIVER PASS 9480 11.0 7.4 149 19.5 17.9 109
SHELL CREEK 9580 19.1 16.0 119 20.3 18.9 107
SYLVAN LAKE 8420 20.7 19.6 106 30.6 26.9 114
SYLVAN ROAD 7120 .2 2.3 9 25.3 22.0 115
TIMBER CREEK 7950 .2 2.0 10 12.0 12.6 95
YOUNTS PEAK 8350 18.7 14.6 128 20.8 20.5 101
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Basin wide percent of average 104 104
SHOSHONE RIVER
BLACKWATER 9780 33.1 28.7 115 31.0 26.9 115
EVENING STAR 9200 32.1 32.0 100 39.9 32.3 124
KIRWIN 9550 12.7 10.6 120 19.9 16.0 124
MARQUETTE 8760 6.4 8.4 76 13.6 16.0 85
SYLVAN LAKE 8420 20.7 19.6 106 30.6 26.9 114
SYLVAN ROAD 7120 .2 2.3 9 25.3 22.0 115
YOUNTS PEAK 8350 18.7 14.6 128 20.8 20.5 101
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Basin wide percent of average 107 113
POWDER-TONGUE
BEAR TRAP MEADOW 8200 .1 .4 25 12.5 12.7 98
BIG GOOSE 7990 8.0 8.7 92 16.6 15.0 111
BONE SPRINGS DIV 9350 17.8 15.7 113 19.0 20.5 93
BURGESS JUNCTION 7880 10.7 9.3 115 16.1 17.2 94
CLOUD PEAK RESERVOIR 9860 18.2 14.3 127 21.9 19.7 111
DOME LAKE 8880 8.5 9.6 89 19.8 19.0 104
GRAVE SPRINGS 8550 5.2 6.7 78 12.5 14.8 84
HANSEN SAWMILL 8360 -M 1.8 * 13.3 12.6 106
MIDDLE POWDER 7760 8.4 10.1 83 13.3 17.7 75
POWDER RIVER PASS 9480 11.0 7.4 149 19.5 17.9 109
SUCKER CREEK 8880 13.4 9.4 143 21.6 19.8 109
TIE CREEK 6870 .0 1.2 0 17.7 15.6 113
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Basin wide percent of average 109 101
BELLE FOURCHE
BLIND PARK 6890 -M .0 * 18.1 16.2 112
COLE CANYON 5910 .2 .5 40 15.6 11.4 137
NORTH RAPID CREEK 6130 .0 .4 0 17.6 12.9 136
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Basin wide percent of average 22 127
UPPER N. PLATTE RIVER
COLUMBINE 9160 1.0 11.7 9 33.2 30.9 107
DIVIDE PEAK 8880 13.8 11.6 119 33.4 26.1 128
ELK RIVER 8700 .1 6.5 2 25.4 24.7 103
JOE WRIGHT 10120 21.1 23.4 90 34.9 32.8 106
NORTH FRENCH CREEK 10130 -M 32.6 * -M 32.3 *
OLD BATTLE 10000 37.2 34.7 107 47.4 42.4 112
SAGE CREEK BASIN 7850 .0 6.7 0 19.4 15.1 128
SOUTH BRUSH CREEK 8440 .0 5.8 0 22.8 22.1 103
TOWER 10500 46.3 51.0 91 50.9 48.0 106
WEBBER SPRINGS 9250 14.5 16.7 87 35.8 33.2 108
WILLOW CREEK PASS 9540 6.4 10.4 62 16.1 17.3 93
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Basin wide percent of average 79 109
LOWER N. PLATTE - SWEETWATER - LARAMIE
BROOKLYN LAKE 10240 18.1 21.9 83 28.4 29.4 97
CASPER MTN. 7900 7.0 10.7 65 17.4 22.1 79
DEADMAN HILL 10220 17.8 17.5 102 23.7 23.1 103
DEER PARK 9700 11.7 16.7 70 23.1 29.1 79
LAPRELE CREEK 8375 .6 3.1 19 16.8 18.5 91
RENO HILL 8400 9.0 8.8 102 21.6 22.8 95
ROACH 9700 9.3 12.5 74 24.2 24.6 98
SAND LAKE 10050 33.1 34.9 95 37.0 32.2 115
SOUTH PASS 9040 9.4 13.0 72 20.0 24.7 81
WINDY PEAK 7900 .7 1.4 50 15.9 15.4 103
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Basin wide percent of average 83 94
LITTLE SNAKE RIVER
BATTLE MOUNTAIN 7440 .0 .0 100 22.9 19.9 115
DIVIDE PEAK 8880 13.8 11.6 119 33.4 26.1 128
OLD BATTLE 10000 37.2 34.7 107 47.4 42.4 112
SANDSTONE RS 8150 .0 3.1 0 25.3 23.6 107
WHISKEY PARK 8950 -M 25.4 * 40.7 36.2 112
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Basin wide percent of average 103 115
UPPER GREEN RIVER
BIG SANDY OPENING 9080 5.8 8.2 71 16.8 17.4 97
BLIND BULL SUM 8650 30.3 24.3 125 25.6 26.8 96
EAST RIM DIVIDE 7930 .0 8.4 0 14.8 15.0 99
ELKHART PARK G.S. 9400 10.8 8.8 123 19.0 17.6 108
GROS VENTRE SUMMIT 8750 9.1 9.2 99 19.4 16.5 118
GUNSIGHT PASS 9820 16.8 -M * 20.9 -M *
KENDALL R.S. 7740 .1 2.7 4 17.4 17.7 98
LOOMIS PARK 8240 5.2 8.9 58 22.3 21.3 105
NEW FORK LAKE 8340 .3 3.1 10 15.1 14.7 103
SNIDER BASIN 8060 3.1 6.8 46 18.0 19.6 92
SPRING CREEK DIVIDE 9000 28.4 23.8 119 32.8 31.8 103
TRIPLE PEAK 8500 16.6 15.8 105 33.7 30.5 110
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Basin wide percent of average 91 103
LOWER GREEN RIVER
HAMS FORK 7840 .1 .4 25 16.0 16.0 100
HEWINTA 9519 .0 3.8 0 17.3 19.2 90
HICKERSON PARK 9145 .0 1.6 0 13.4 11.5 117
HOLE-IN-ROCK 9150 .0 1.4 0 12.8 11.1 115
INDIAN CREEK 9425 -M 22.9 * 27.5 31.2 88
KELLEY R.S. 8180 7.1 8.2 87 22.1 25.0 88
STEEL CREEK PARK 10200 -M 17.6 * 21.0 21.8 96
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Basin wide percent of average 47 96
UPPER BEAR RIVER
BUG LAKE 7950 7.1 9.7 73 22.0 23.9 92
HAYDEN FORK 9212 .0 6.5 0 27.3 27.0 101
KELLEY R.S. 8180 7.1 8.2 87 22.1 25.0 88
LILY LAKE 9156 .0 5.6 0 21.5 22.8 94
MONTE CRISTO 8960 16.4 21.6 76 32.0 32.5 98
SALT RIVER SUMMIT 7760 4.5 3.9 115 20.2 23.0 88
TRIAL LAKE 9992 14.2 22.4 63 29.7 31.6 94
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Basin wide percent of average 63 94
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-M = Missing data
* = Data may not provide a valid measure of conditions.
Units = inches for the Current and Average Snow Water Equivalent and
Total Precipitation values
If the Basin wide percent of average 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 Average represents the snow water
equivalent found at selected SNOTEL sites in or near the basin compared to
the average 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.
Reference period for average conditions is 1961-90.
Provisional data, subject to revision.
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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.