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 4 , 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 9.2 11.5 80 22.7 24.5 93
COTTONWOOD CREEK 7670 27.6 19.0 145 37.5 32.2 116
GRAND TARGHEE 9260 54.9 -M * 41.6 -M *
GRANITE CREEK 6770 11.4 12.2 93 24.4 22.6 108
GRASSY LAKE 7265 32.7 32.6 100 41.1 41.2 100
GROS VENTRE SUMMIT 8750 14.0 12.9 109 18.6 15.4 121
GUNSIGHT PASS 9820 17.8 -M * 20.1 -M *
LEWIS LAKE DIVIDE 7850 36.7 34.0 108 39.8 41.9 95
PHILLIPS BENCH 8200 30.6 28.9 106 34.6 33.4 104
SALT RIVER SUMMIT 7760 13.7 9.9 138 20.0 21.8 92
SNAKE RIVER STATION 6920 12.8 11.4 112 27.5 25.7 107
SPRING CREEK DIVIDE 9000 32.8 28.3 116 31.9 30.4 105
THUMB DIVIDE 7980 20.8 14.3 145 25.9 22.2 117
TOGWOTEE PASS 9580 31.9 28.0 114 35.0 29.2 120
TWO OCEAN PLATEAU 9240 45.8 31.8 144 35.4 32.4 109
WILLOW CREEK 8380 36.2 30.1 120 47.1 38.0 124
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Basin wide percent of average 117 107
UPPER YELLOWSTONE-MADISON
BEARTOOTH LAKE 9360 26.8 26.0 103 24.9 23.8 105
BLACK BEAR 8170 41.6 39.5 105 42.5 46.2 92
CANYON 7870 14.8 10.7 138 18.9 17.9 106
FISHER CREEK 9100 40.9 37.7 108 40.6 42.2 96
MADISON PLATEAU 7750 25.7 23.7 108 30.2 30.6 99
NORTHEAST ENTRANCE 7350 5.2 6.3 83 16.3 15.0 109
PARKER PEAK 9400 32.5 24.6 132 22.8 19.7 116
SYLVAN LAKE 8420 22.8 23.4 97 28.5 25.0 114
THUMB DIVIDE 7980 20.8 14.3 145 25.9 22.2 117
TWO OCEAN PLATEAU 9240 45.8 31.8 144 35.4 32.4 109
WHISKEY CREEK 6800 19.0 14.5 131 25.1 24.4 103
WHITE MILL 8700 28.1 26.3 107 28.4 31.5 90
WOLVERINE 7650 9.0 6.6 136 15.3 15.4 99
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Basin wide percent of average 117 102
WIND RIVER
BURROUGHS CREEK 8750 18.8 13.2 142 20.9 19.5 107
COLD SPRINGS 9630 9.6 4.7 204 15.1 14.1 107
DEER PARK 9700 15.6 18.1 86 22.3 27.2 82
HOBBS PARK 10100 18.4 18.0 102 20.2 17.2 117
LITTLE WARM 9370 13.4 10.5 128 19.0 17.0 112
SOUTH PASS 9040 15.7 17.7 89 19.8 23.0 86
ST. LAWRENCE ALT 8620 7.7 5.8 133 14.5 12.3 118
TOGWOTEE PASS 9580 31.9 28.0 114 35.0 29.2 120
TOWNSEND CREEK 8700 11.5 8.6 134 17.3 15.8 109
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Basin wide percent of average 114 105
BIGHORN BASIN
BALD MTN. 9380 20.8 23.5 89 18.6 21.6 86
BEAR TRAP MEADOW 8200 5.8 2.1 276 12.0 11.1 108
BLACKWATER 9780 30.6 29.0 106 28.1 25.0 112
BONE SPRINGS DIV 9350 18.3 18.2 101 17.4 18.6 94
EVENING STAR 9200 32.6 33.3 98 36.3 30.2 120
GRAVE SPRINGS 8550 9.8 10.8 91 12.4 13.4 93
KIRWIN 9550 15.9 12.9 123 18.7 14.4 130
MARQUETTE 8760 9.1 11.0 83 12.6 14.0 90
MIDDLE POWDER 7760 12.1 14.0 86 12.7 16.0 79
OWL CREEK 8975 5.0 3.8 132 9.9 8.4 118
POWDER RIVER PASS 9480 12.8 10.2 125 18.5 16.1 115
SHELL CREEK 9580 18.8 16.7 113 18.6 17.1 109
SYLVAN LAKE 8420 22.8 23.4 97 28.5 25.0 114
SYLVAN ROAD 7120 6.6 7.6 87 23.0 20.7 111
TIMBER CREEK 7950 5.3 4.7 113 11.8 10.8 109
YOUNTS PEAK 8350 20.8 18.1 115 19.4 19.0 102
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Basin wide percent of average 103 106
SHOSHONE RIVER
BLACKWATER 9780 30.6 29.0 106 28.1 25.0 112
EVENING STAR 9200 32.6 33.3 98 36.3 30.2 120
KIRWIN 9550 15.9 12.9 123 18.7 14.4 130
MARQUETTE 8760 9.1 11.0 83 12.6 14.0 90
SYLVAN LAKE 8420 22.8 23.4 97 28.5 25.0 114
SYLVAN ROAD 7120 6.6 7.6 87 23.0 20.7 111
YOUNTS PEAK 8350 20.8 18.1 115 19.4 19.0 102
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Basin wide percent of average 102 112
POWDER-TONGUE
BEAR TRAP MEADOW 8200 5.8 2.1 276 12.0 11.1 108
BIG GOOSE 7990 11.0 11.3 97 15.9 13.2 120
BONE SPRINGS DIV 9350 18.3 18.2 101 17.4 18.6 94
BURGESS JUNCTION 7880 13.4 13.0 103 15.6 15.6 100
CLOUD PEAK RESERVOIR 9860 19.7 16.2 122 21.0 17.4 121
DOME LAKE 8880 12.7 13.1 97 18.8 17.1 110
GRAVE SPRINGS 8550 9.8 10.8 91 12.4 13.4 93
HANSEN SAWMILL 8360 3.9 4.6 85 12.9 11.2 115
MIDDLE POWDER 7760 12.1 14.0 86 12.7 16.0 79
POWDER RIVER PASS 9480 12.8 10.2 125 18.5 16.1 115
SUCKER CREEK 8880 15.9 12.7 125 20.6 17.7 116
TIE CREEK 6870 4.0 3.8 105 17.4 13.8 126
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Basin wide percent of average 107 108
BELLE FOURCHE
BLIND PARK 6890 .0 3.9 0 17.2 14.4 119
COLE CANYON 5910 4.4 4.1 107 15.0 9.8 153
NORTH RAPID CREEK 6130 1.3 3.1 42 16.9 11.6 146
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Basin wide percent of average 51 137
UPPER N. PLATTE RIVER
COLUMBINE 9160 17.5 20.0 88 32.3 29.4 110
DIVIDE PEAK 8880 26.5 18.6 142 33.3 24.5 136
ELK RIVER 8700 12.3 14.0 88 25.6 23.3 110
JOE WRIGHT 10120 27.4 25.1 109 34.4 30.4 113
NORTH FRENCH CREEK 10130 39.9 34.5 116 38.7 30.0 129
OLD BATTLE 10000 41.2 37.1 111 46.8 40.2 116
SAGE CREEK BASIN 7850 9.7 10.8 90 19.4 14.2 137
SOUTH BRUSH CREEK 8440 9.3 10.5 89 22.5 20.4 110
TOWER 10500 51.5 52.4 98 49.5 45.6 109
WEBBER SPRINGS 9250 24.5 24.5 100 35.5 31.4 113
WILLOW CREEK PASS 9540 13.3 14.0 95 15.4 15.9 97
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Basin wide percent of average 104 116
LOWER N. PLATTE - SWEETWATER - LARAMIE
BROOKLYN LAKE 10240 26.2 28.0 94 27.5 27.3 101
CASPER MTN. 7900 14.2 16.6 86 17.6 19.9 88
DEADMAN HILL 10220 22.9 19.7 116 23.6 21.2 111
DEER PARK 9700 15.6 18.1 86 22.3 27.2 82
LAPRELE CREEK 8375 8.9 6.6 135 16.7 16.7 100
RENO HILL 8400 15.6 14.2 110 21.3 20.6 103
ROACH 9700 18.3 18.1 101 24.1 22.7 106
SAND LAKE 10050 37.1 37.0 100 36.2 29.7 122
SOUTH PASS 9040 15.7 17.7 89 19.8 23.0 86
WINDY PEAK 7900 9.2 4.5 204 14.9 13.8 108
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Basin wide percent of average 102 101
LITTLE SNAKE RIVER
BATTLE MOUNTAIN 7440 1.3 4.0 32 22.7 18.8 121
DIVIDE PEAK 8880 26.5 18.6 142 33.3 24.5 136
OLD BATTLE 10000 41.2 37.1 111 46.8 40.2 116
SANDSTONE RS 8150 12.1 8.7 139 25.1 22.1 114
WHISKEY PARK 8950 31.8 30.3 105 40.5 34.2 118
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Basin wide percent of average 114 120
UPPER GREEN RIVER
BIG SANDY OPENING 9080 -M 13.0 * 16.2 16.1 101
BLIND BULL SUM 8650 31.3 27.6 113 24.3 25.4 96
EAST RIM DIVIDE 7930 4.5 12.8 35 14.4 14.0 103
ELKHART PARK G.S. 9400 15.0 12.5 120 18.6 16.2 115
GROS VENTRE SUMMIT 8750 14.0 12.9 109 18.6 15.4 121
GUNSIGHT PASS 9820 17.8 -M * 20.1 -M *
KENDALL R.S. 7740 5.4 9.2 59 16.7 16.7 100
LOOMIS PARK 8240 12.8 13.8 93 21.7 20.1 108
NEW FORK LAKE 8340 8.9 7.9 113 13.8 13.6 101
SNIDER BASIN 8060 12.8 12.1 106 17.7 18.7 95
SPRING CREEK DIVIDE 9000 32.8 28.3 116 31.9 30.4 105
TRIPLE PEAK 8500 23.6 23.1 102 31.7 28.9 110
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Basin wide percent of average 101 105
LOWER GREEN RIVER
HAMS FORK 7840 5.8 5.3 109 15.3 14.9 103
HEWINTA 9519 4.0 8.6 47 17.2 18.0 96
HICKERSON PARK 9145 3.2 5.2 62 13.4 10.4 129
HOLE-IN-ROCK 9150 3.2 4.3 74 12.8 9.9 129
INDIAN CREEK 9425 -M 27.9 * 26.7 29.7 90
KELLEY R.S. 8180 14.9 13.5 110 21.8 23.8 92
STEEL CREEK PARK 10200 17.4 18.8 93 21.0 20.5 102
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Basin wide percent of average 87 101
UPPER BEAR RIVER
BUG LAKE 7950 17.3 17.2 101 21.8 22.6 96
HAYDEN FORK 9212 9.5 12.3 77 27.3 25.4 107
KELLEY R.S. 8180 14.9 13.5 110 21.8 23.8 92
LILY LAKE 9156 10.8 10.5 103 21.6 21.3 101
MONTE CRISTO 8960 27.0 27.7 97 31.9 30.6 104
SALT RIVER SUMMIT 7760 13.7 9.9 138 20.0 21.8 92
TRIAL LAKE 9992 26.6 26.3 101 29.7 29.7 100
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Basin wide percent of average 102 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.