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: APRIL 20 , 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 14.1 15.9 89 21.3 23.3 91
COTTONWOOD CREEK 7670 28.6 23.1 124 34.7 30.3 115
GRAND TARGHEE 9260 49.4 -M * 38.0 -M *
GRANITE CREEK 6770 16.0 16.1 99 23.2 21.4 108
GRASSY LAKE 7265 34.0 36.6 93 38.0 39.1 97
GROS VENTRE SUMMIT 8750 -M 14.5 * 17.4 14.3 122
GUNSIGHT PASS 9820 16.6 -M * 17.9 -M *
LEWIS LAKE DIVIDE 7850 -M 36.5 * -M 40.0 *
PHILLIPS BENCH 8200 30.2 30.7 98 33.0 31.6 104
SALT RIVER SUMMIT 7760 15.9 13.8 115 18.6 20.6 90
SNAKE RIVER STATION 6920 17.3 16.5 105 24.8 24.4 102
SPRING CREEK DIVIDE 9000 31.4 28.8 109 29.9 28.9 103
THUMB DIVIDE 7980 21.2 18.0 118 23.9 20.8 115
TOGWOTEE PASS 9580 30.4 27.1 112 32.6 27.3 119
TWO OCEAN PLATEAU 9240 41.5 31.1 133 32.1 30.4 106
WILLOW CREEK 8380 37.2 31.9 117 43.3 35.6 122
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Basin wide percent of average 110 107
UPPER YELLOWSTONE-MADISON
BEARTOOTH LAKE 9360 25.1 25.6 98 23.0 22.2 104
BLACK BEAR 8170 38.8 40.9 95 38.9 44.0 88
CANYON 7870 14.4 13.3 108 16.5 16.9 98
FISHER CREEK 9100 38.7 37.3 104 38.5 39.8 97
MADISON PLATEAU 7750 25.0 25.9 97 26.9 29.3 92
NORTHEAST ENTRANCE 7350 9.2 9.9 93 15.0 13.9 108
PARKER PEAK 9400 29.7 23.7 125 20.4 18.2 112
SYLVAN LAKE 8420 21.9 24.1 91 25.5 23.2 110
THUMB DIVIDE 7980 21.2 18.0 118 23.9 20.8 115
TWO OCEAN PLATEAU 9240 41.5 31.1 133 32.1 30.4 106
WHISKEY CREEK 6800 18.5 17.5 106 22.6 23.0 98
WHITE MILL 8700 26.5 26.2 101 26.4 29.6 89
WOLVERINE 7650 11.6 10.2 114 13.6 14.2 96
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Basin wide percent of average 106 99
WIND RIVER
BURROUGHS CREEK 8750 17.5 14.9 117 18.6 18.1 103
COLD SPRINGS 9630 9.3 6.1 152 12.7 12.5 102
DEER PARK 9700 15.1 17.8 85 20.3 24.8 82
HOBBS PARK 10100 16.9 17.0 99 17.2 15.2 113
LITTLE WARM 9370 13.0 12.2 107 16.5 15.3 108
SOUTH PASS 9040 15.7 17.8 88 17.7 20.9 85
ST. LAWRENCE ALT 8620 8.1 6.8 119 12.1 10.6 114
TOGWOTEE PASS 9580 30.4 27.1 112 32.6 27.3 119
TOWNSEND CREEK 8700 11.7 9.6 122 15.2 13.9 109
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Basin wide percent of average 106 103
BIGHORN BASIN
BALD MTN. 9380 19.9 22.3 89 16.8 19.6 86
BEAR TRAP MEADOW 8200 7.7 4.0 192 10.5 9.8 107
BLACKWATER 9780 28.2 27.2 104 25.5 23.1 110
BONE SPRINGS DIV 9350 17.0 17.7 96 15.8 16.8 94
EVENING STAR 9200 31.9 32.4 98 33.9 28.2 120
GRAVE SPRINGS 8550 10.3 10.8 95 11.5 11.8 97
KIRWIN 9550 14.9 12.5 119 16.4 12.9 127
MARQUETTE 8760 8.6 10.6 81 10.6 12.0 88
MIDDLE POWDER 7760 12.9 14.2 91 11.6 14.3 81
OWL CREEK 8975 6.4 5.0 128 7.7 7.2 107
POWDER RIVER PASS 9480 13.1 11.7 112 16.1 14.3 113
SHELL CREEK 9580 17.7 16.3 109 17.0 15.3 111
SYLVAN LAKE 8420 21.9 24.1 91 25.5 23.2 110
SYLVAN ROAD 7120 12.0 11.3 106 21.0 19.4 108
TIMBER CREEK 7950 5.6 5.5 102 9.6 9.0 107
YOUNTS PEAK 8350 19.8 18.2 109 17.7 17.8 99
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Basin wide percent of average 102 105
SHOSHONE RIVER
BLACKWATER 9780 28.2 27.2 104 25.5 23.1 110
EVENING STAR 9200 31.9 32.4 98 33.9 28.2 120
KIRWIN 9550 14.9 12.5 119 16.4 12.9 127
MARQUETTE 8760 8.6 10.6 81 10.6 12.0 88
SYLVAN LAKE 8420 21.9 24.1 91 25.5 23.2 110
SYLVAN ROAD 7120 12.0 11.3 106 21.0 19.4 108
YOUNTS PEAK 8350 19.8 18.2 109 17.7 17.8 99
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Basin wide percent of average 101 110
POWDER-TONGUE
BEAR TRAP MEADOW 8200 7.7 4.0 192 10.5 9.8 107
BIG GOOSE 7990 11.9 12.5 95 14.8 11.2 132
BONE SPRINGS DIV 9350 17.0 17.7 96 15.8 16.8 94
BURGESS JUNCTION 7880 13.6 13.3 102 14.5 14.0 104
CLOUD PEAK RESERVOIR 9860 19.8 15.6 127 19.2 15.2 126
DOME LAKE 8880 14.1 13.8 102 17.5 15.2 115
GRAVE SPRINGS 8550 10.3 10.8 95 11.5 11.8 97
HANSEN SAWMILL 8360 6.9 5.7 121 11.5 9.7 119
MIDDLE POWDER 7760 12.9 14.2 91 11.6 14.3 81
POWDER RIVER PASS 9480 13.1 11.7 112 16.1 14.3 113
SUCKER CREEK 8880 16.4 13.4 122 19.0 15.7 121
TIE CREEK 6870 6.6 5.3 125 16.2 11.9 136
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Basin wide percent of average 109 111
BELLE FOURCHE
BLIND PARK 6890 3.4 7.0 49 15.8 12.8 123
COLE CANYON 5910 6.8 6.9 99 13.8 8.0 172
NORTH RAPID CREEK 6130 7.6 8.3 92 15.9 9.9 161
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Basin wide percent of average 80 148
UPPER N. PLATTE RIVER
COLUMBINE 9160 27.1 24.1 112 30.2 27.7 109
DIVIDE PEAK 8880 27.9 20.9 133 30.4 22.9 133
ELK RIVER 8700 23.7 19.0 125 24.6 21.7 113
JOE WRIGHT 10120 26.5 24.1 110 32.3 27.9 116
NORTH FRENCH CREEK 10130 38.3 33.3 115 35.6 27.6 129
OLD BATTLE 10000 38.9 35.3 110 44.0 37.8 116
SAGE CREEK BASIN 7850 15.8 12.1 131 17.0 13.3 128
SOUTH BRUSH CREEK 8440 13.7 13.0 105 19.8 18.6 106
TOWER 10500 48.5 50.4 96 45.0 42.6 106
WEBBER SPRINGS 9250 29.4 26.0 113 33.6 29.5 114
WILLOW CREEK PASS 9540 14.7 14.0 105 14.6 14.5 101
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Basin wide percent of average 112 115
LOWER N. PLATTE - SWEETWATER - LARAMIE
BROOKLYN LAKE 10240 26.9 27.2 99 25.4 25.0 102
CASPER MTN. 7900 14.8 17.2 86 15.6 17.4 90
DEADMAN HILL 10220 21.4 18.8 114 21.7 19.3 112
DEER PARK 9700 15.1 17.8 85 20.3 24.8 82
LAPRELE CREEK 8375 9.4 9.6 98 15.1 14.8 102
RENO HILL 8400 17.7 16.0 111 19.7 18.0 109
ROACH 9700 19.7 18.5 106 22.3 20.9 107
SAND LAKE 10050 35.5 35.6 100 33.7 27.2 124
SOUTH PASS 9040 15.7 17.8 88 17.7 20.9 85
WINDY PEAK 7900 10.2 7.4 138 12.9 12.2 106
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Basin wide percent of average 100 102
LITTLE SNAKE RIVER
BATTLE MOUNTAIN 7440 16.7 7.7 217 20.6 17.5 118
DIVIDE PEAK 8880 27.9 20.9 133 30.4 22.9 133
OLD BATTLE 10000 38.9 35.3 110 44.0 37.8 116
SANDSTONE RS 8150 22.1 12.8 173 23.2 20.5 113
WHISKEY PARK 8950 35.9 30.6 117 38.0 31.7 120
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Basin wide percent of average 132 120
UPPER GREEN RIVER
BIG SANDY OPENING 9080 13.8 15.2 91 14.5 14.8 98
BLIND BULL SUM 8650 30.2 28.8 105 22.8 24.2 94
EAST RIM DIVIDE 7930 9.6 14.0 69 13.7 13.1 105
ELKHART PARK G.S. 9400 15.3 14.0 109 17.0 14.9 114
GROS VENTRE SUMMIT 8750 -M 14.5 * 17.4 14.3 122
GUNSIGHT PASS 9820 16.6 -M * 17.9 -M *
KENDALL R.S. 7740 9.5 13.0 73 15.2 15.8 96
LOOMIS PARK 8240 16.7 16.6 101 20.7 19.0 109
NEW FORK LAKE 8340 11.9 10.9 109 12.4 12.5 99
SNIDER BASIN 8060 15.5 14.7 105 17.0 17.7 96
SPRING CREEK DIVIDE 9000 31.4 28.8 109 29.9 28.9 103
TRIPLE PEAK 8500 25.7 25.8 100 29.6 27.2 109
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Basin wide percent of average 99 104
LOWER GREEN RIVER
HAMS FORK 7840 11.5 9.1 126 14.4 13.7 105
HEWINTA 9519 13.6 11.9 114 15.7 16.6 95
HICKERSON PARK 9145 8.2 7.9 104 11.9 9.3 128
HOLE-IN-ROCK 9150 7.7 6.9 112 11.3 8.8 128
INDIAN CREEK 9425 28.1 29.6 95 25.5 28.1 91
KELLEY R.S. 8180 17.5 16.7 105 20.6 22.4 92
STEEL CREEK PARK 10200 16.1 17.6 91 19.2 18.8 102
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Basin wide percent of average 103 101
UPPER BEAR RIVER
BUG LAKE 7950 20.7 21.2 98 20.4 21.2 96
HAYDEN FORK 9212 18.6 16.0 116 25.1 23.6 106
KELLEY R.S. 8180 17.5 16.7 105 20.6 22.4 92
LILY LAKE 9156 16.7 14.0 119 19.6 19.8 99
MONTE CRISTO 8960 30.8 30.3 102 30.2 28.4 106
SALT RIVER SUMMIT 7760 15.9 13.8 115 18.6 20.6 90
TRIAL LAKE 9992 28.2 26.5 106 27.1 27.7 98
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Basin wide percent of average 107 99
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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.