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 11 , 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 6.6 8.7 76 24.1 25.2 96
COTTONWOOD CREEK 7670 24.3 16.2 150 38.5 33.2 116
GRAND TARGHEE 9260 55.5 -M * 42.3 -M *
GRANITE CREEK 6770 8.7 9.7 90 25.4 23.1 110
GRASSY LAKE 7265 29.4 29.3 100 42.7 42.2 101
GROS VENTRE SUMMIT 8750 12.4 11.3 110 19.3 16.0 121
GUNSIGHT PASS 9820 18.3 -M * 20.7 -M *
LEWIS LAKE DIVIDE 7850 36.7 31.4 117 41.2 42.8 96
PHILLIPS BENCH 8200 29.7 26.4 112 35.9 34.2 105
SALT RIVER SUMMIT 7760 10.5 7.1 148 20.4 22.4 91
SNAKE RIVER STATION 6920 10.0 8.2 122 28.5 26.4 108
SPRING CREEK DIVIDE 9000 32.5 26.6 122 32.6 31.1 105
THUMB DIVIDE 7980 19.5 11.7 167 26.8 22.9 117
TOGWOTEE PASS 9580 33.1 28.0 118 36.1 30.2 120
TWO OCEAN PLATEAU 9240 47.8 31.4 152 36.9 33.4 110
WILLOW CREEK 8380 34.1 27.6 124 48.3 39.3 123
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Basin wide percent of average 123 108
UPPER YELLOWSTONE-MADISON
BEARTOOTH LAKE 9360 28.3 25.9 109 26.4 24.6 107
BLACK BEAR 8170 43.9 38.1 115 44.9 47.3 95
CANYON 7870 14.9 8.6 173 19.9 18.5 108
FISHER CREEK 9100 43.9 37.4 117 43.6 43.4 100
MADISON PLATEAU 7750 25.0 21.5 116 31.6 31.5 100
NORTHEAST ENTRANCE 7350 2.2 5.0 44 17.3 15.6 111
PARKER PEAK 9400 33.4 24.4 137 23.9 20.6 116
SYLVAN LAKE 8420 23.3 21.8 107 29.8 25.9 115
THUMB DIVIDE 7980 19.5 11.7 167 26.8 22.9 117
TWO OCEAN PLATEAU 9240 47.8 31.4 152 36.9 33.4 110
WHISKEY CREEK 6800 17.6 12.1 145 26.4 25.1 105
WHITE MILL 8700 30.5 25.8 118 30.7 32.4 95
WOLVERINE 7650 6.3 4.7 134 16.4 16.1 102
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Basin wide percent of average 125 105
WIND RIVER
BURROUGHS CREEK 8750 18.6 11.4 163 21.7 20.3 107
COLD SPRINGS 9630 7.5 4.2 179 15.6 15.0 104
DEER PARK 9700 15.1 16.3 93 23.0 28.1 82
HOBBS PARK 10100 18.1 17.3 105 20.8 18.3 114
LITTLE WARM 9370 12.6 8.9 142 19.6 17.9 109
SOUTH PASS 9040 14.1 15.7 90 20.1 23.9 84
ST. LAWRENCE ALT 8620 -M 4.8 * -M 13.2 *
TOGWOTEE PASS 9580 33.1 28.0 118 36.1 30.2 120
TOWNSEND CREEK 8700 9.2 7.0 131 17.4 16.6 105
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Basin wide percent of average 118 102
BIGHORN BASIN
BALD MTN. 9380 22.0 23.6 93 19.6 22.7 86
BEAR TRAP MEADOW 8200 2.7 1.4 193 12.4 11.9 104
BLACKWATER 9780 32.3 28.7 113 29.6 26.0 114
BONE SPRINGS DIV 9350 19.2 17.2 112 18.6 19.6 95
EVENING STAR 9200 34.7 33.2 105 38.9 31.2 125
GRAVE SPRINGS 8550 8.4 9.6 88 12.6 14.2 89
KIRWIN 9550 15.6 12.1 129 19.6 15.2 129
MARQUETTE 8760 8.4 9.9 85 12.9 15.1 85
MIDDLE POWDER 7760 11.0 12.4 89 13.2 16.9 78
OWL CREEK 8975 1.5 3.1 48 10.3 9.1 113
POWDER RIVER PASS 9480 13.3 9.2 145 19.2 17.0 113
SHELL CREEK 9580 19.8 16.9 117 19.9 18.0 111
SYLVAN LAKE 8420 23.3 21.8 107 29.8 25.9 115
SYLVAN ROAD 7120 1.7 4.8 35 24.4 21.4 114
TIMBER CREEK 7950 3.0 3.3 91 12.1 11.8 103
YOUNTS PEAK 8350 20.9 16.8 124 20.4 19.7 104
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Basin wide percent of average 106 106
SHOSHONE RIVER
BLACKWATER 9780 32.3 28.7 113 29.6 26.0 114
EVENING STAR 9200 34.7 33.2 105 38.9 31.2 125
KIRWIN 9550 15.6 12.1 129 19.6 15.2 129
MARQUETTE 8760 8.4 9.9 85 12.9 15.1 85
SYLVAN LAKE 8420 23.3 21.8 107 29.8 25.9 115
SYLVAN ROAD 7120 1.7 4.8 35 24.4 21.4 114
YOUNTS PEAK 8350 20.9 16.8 124 20.4 19.7 104
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Basin wide percent of average 108 114
POWDER-TONGUE
BEAR TRAP MEADOW 8200 2.7 1.4 193 12.4 11.9 104
BIG GOOSE 7990 10.3 10.1 102 16.3 14.2 115
BONE SPRINGS DIV 9350 19.2 17.2 112 18.6 19.6 95
BURGESS JUNCTION 7880 12.7 11.7 109 15.9 16.5 96
CLOUD PEAK RESERVOIR 9860 20.0 15.6 128 21.3 18.6 115
DOME LAKE 8880 11.8 11.6 102 19.4 18.1 107
GRAVE SPRINGS 8550 8.4 9.6 88 12.6 14.2 89
HANSEN SAWMILL 8360 1.1 3.5 31 13.2 11.9 111
MIDDLE POWDER 7760 11.0 12.4 89 13.2 16.9 78
POWDER RIVER PASS 9480 13.3 9.2 145 19.2 17.0 113
SUCKER CREEK 8880 15.6 11.6 134 21.1 18.8 112
TIE CREEK 6870 1.0 2.5 40 17.6 14.7 120
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Basin wide percent of average 109 104
BELLE FOURCHE
BLIND PARK 6890 -M 1.6 * 17.8 15.3 116
COLE CANYON 5910 .7 1.7 41 15.2 10.7 142
NORTH RAPID CREEK 6130 .0 1.3 0 17.3 12.3 141
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Basin wide percent of average 23 131
UPPER N. PLATTE RIVER
COLUMBINE 9160 10.9 16.3 67 33.0 30.2 109
DIVIDE PEAK 8880 22.6 15.5 146 33.5 25.3 132
ELK RIVER 8700 4.7 10.3 46 25.8 24.0 108
JOE WRIGHT 10120 26.2 24.7 106 34.9 31.6 110
NORTH FRENCH CREEK 10130 -M 34.2 * -M 31.3 *
OLD BATTLE 10000 40.7 36.8 111 47.3 41.4 114
SAGE CREEK BASIN 7850 1.3 9.0 14 19.4 14.7 132
SOUTH BRUSH CREEK 8440 4.1 8.3 49 22.8 21.3 107
TOWER 10500 50.2 52.3 96 50.8 46.9 108
WEBBER SPRINGS 9250 20.1 21.2 95 35.7 32.4 110
WILLOW CREEK PASS 9540 11.6 12.8 91 16.0 16.6 96
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Basin wide percent of average 93 112
LOWER N. PLATTE - SWEETWATER - LARAMIE
BROOKLYN LAKE 10240 24.4 25.7 95 28.3 28.4 100
CASPER MTN. 7900 11.5 14.1 82 17.6 21.0 84
DEADMAN HILL 10220 21.3 19.1 112 23.8 22.2 107
DEER PARK 9700 15.1 16.3 93 23.0 28.1 82
LAPRELE CREEK 8375 6.1 4.8 127 16.9 17.6 96
RENO HILL 8400 13.0 11.8 110 21.4 21.7 99
ROACH 9700 15.3 15.7 97 24.2 23.7 102
SAND LAKE 10050 36.7 36.6 100 36.8 31.0 119
SOUTH PASS 9040 14.1 15.7 90 20.1 23.9 84
WINDY PEAK 7900 5.5 2.7 204 15.0 14.6 103
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Basin wide percent of average 100 98
LITTLE SNAKE RIVER
BATTLE MOUNTAIN 7440 .0 2.0 0 22.9 19.4 118
DIVIDE PEAK 8880 22.6 15.5 146 33.5 25.3 132
OLD BATTLE 10000 40.7 36.8 111 47.3 41.4 114
SANDSTONE RS 8150 4.8 5.8 83 25.3 22.9 110
WHISKEY PARK 8950 30.0 28.6 105 40.8 35.3 116
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Basin wide percent of average 111 118
UPPER GREEN RIVER
BIG SANDY OPENING 9080 11.1 10.9 102 16.7 16.8 99
BLIND BULL SUM 8650 32.2 26.2 123 25.4 26.1 97
EAST RIM DIVIDE 7930 .4 10.9 4 14.6 14.5 101
ELKHART PARK G.S. 9400 14.4 10.9 132 18.9 16.9 112
GROS VENTRE SUMMIT 8750 12.4 11.3 110 19.3 16.0 121
GUNSIGHT PASS 9820 18.3 -M * 20.7 -M *
KENDALL R.S. 7740 1.9 6.2 31 17.2 17.2 100
LOOMIS PARK 8240 10.6 11.5 92 22.3 20.7 108
NEW FORK LAKE 8340 5.9 5.6 105 14.2 14.1 101
SNIDER BASIN 8060 9.1 9.7 94 18.2 19.1 95
SPRING CREEK DIVIDE 9000 32.5 26.6 122 32.6 31.1 105
TRIPLE PEAK 8500 22.6 19.9 114 33.5 29.7 113
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Basin wide percent of average 102 105
LOWER GREEN RIVER
HAMS FORK 7840 .5 2.9 17 15.9 15.5 103
HEWINTA 9519 .0 6.2 0 17.2 18.6 92
HICKERSON PARK 9145 .0 3.3 0 13.3 11.0 121
HOLE-IN-ROCK 9150 .0 2.8 0 12.7 10.5 121
INDIAN CREEK 9425 -M 25.7 * 27.4 30.5 90
KELLEY R.S. 8180 12.0 11.1 108 22.1 24.4 91
STEEL CREEK PARK 10200 16.0 18.8 85 21.0 21.2 99
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Basin wide percent of average 63 98
UPPER BEAR RIVER
BUG LAKE 7950 13.1 13.6 96 21.9 23.3 94
HAYDEN FORK 9212 2.6 9.5 27 27.3 26.2 104
KELLEY R.S. 8180 12.0 11.1 108 22.1 24.4 91
LILY LAKE 9156 4.2 8.1 52 21.5 22.1 97
MONTE CRISTO 8960 23.1 25.0 92 32.0 31.6 101
SALT RIVER SUMMIT 7760 10.5 7.1 148 20.4 22.4 91
TRIAL LAKE 9992 22.8 24.9 92 29.7 30.7 97
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Basin wide percent of average 89 97
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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.