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 THURSDAY: APRIL 15 , 1999
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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 23.5 16.2 146 28.4 24.0 119
COTTONWOOD CREEK 7600 25.7 23.4 110 29.4 26.9 110
GRANITE CREEK 6770 22.2 17.9 125 24.0 25.4 95
GRASSY LAKE 7265 43.4 37.9 115 42.4 39.9 107
GROS VENTRE SUMMIT 8775 17.0 16.0 107 16.9 17.2 98
LEWIS LAKE DIVIDE 7860 41.7 36.9 113 41.3 40.7 102
PHILLIPS BENCH 8200 34.4 31.0 111 33.7 32.2 105
SALT RIVER SUMMIT 7600 16.7 14.0 120 19.4 18.2 107
SNAKE RIVER STATION 6920 21.9 18.7 117 26.5 28.0 95
SPRING CREEK DIVIDE 9000 32.3 29.5 110 30.0 29.4 103
THUMB DIVIDE 7980 -M 17.4 * -M 22.4 *
TOGWOTEE PASS 9580 -M 27.2 * 30.7 30.4 101
TWO OCEAN PLATEAU 9360 38.0 26.7 143 31.9 33.0 97
WILLOW CREEK 8450 35.3 31.9 112 39.9 34.5 116
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Basin wide percent of average 118 104
UPPER YELLOWSTONE-MADISON
BEARTOOTH LAKE 9275 27.0 25.7 106 24.2 19.7 123
BLACK BEAR 7950 50.8 40.3 127 -M 43.8 *
CANYON 7940 19.2 13.6 141 20.2 15.4 133
FISHER CREEK 9100 41.3 38.0 109 37.9 39.5 96
MADISON PLATEAU 7750 -M 25.7 * 33.7 28.2 120
NORTHEAST ENTRANCE 7350 13.0 9.0 145 14.5 13.0 113
PARKER PEAK 9400 25.0 23.4 108 -M 16.9 *
SYLVAN LAKE 8420 27.4 24.0 114 29.2 20.9 141
THUMB DIVIDE 7980 -M 17.4 * -M 22.4 *
TWO OCEAN PLATEAU 9360 38.0 26.7 143 31.9 33.0 97
WHISKEY CREEK 6800 22.2 18.4 121 25.5 23.5 109
WHITE MILL 8700 28.9 25.9 112 25.7 30.7 84
WOLVERINE 7650 13.6 12.0 115 13.2 14.0 95
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Basin wide percent of average 120 108
WIND RIVER
BURROUGHS CREEK 8750 17.9 15.5 116 19.2 18.0 107
COLD SPRINGS 9630 10.0 8.7 114 13.2 11.9 112
DEER PARK 9700 18.7 -M * 24.4 -M *
HOBBS PARK 10100 19.5 16.7 118 18.0 15.7 115
LITTLE WARM 9620 15.9 13.6 117 17.4 14.9 118
SOUTH PASS 9040 19.9 17.7 113 21.4 18.9 114
ST. LAWRENCE ALT 8620 8.0 7.3 112 12.0 11.4 106
TOGWOTEE PASS 9580 -M 27.2 * 30.7 30.4 101
TOWNSEND CREEK 8700 11.6 10.5 111 15.5 14.0 111
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Basin wide percent of average 115 110
BIGHORN BASIN
BALD MTN. 9375 21.4 22.4 96 19.4 19.0 102
BEAR TRAP MEADOW 7900 3.5 7.0 50 11.0 9.5 116
BLACKWATER 9780 31.9 24.9 129 26.2 19.4 136
BONE SPRINGS DIV 9350 20.2 18.2 111 18.4 16.7 111
EVENING STAR 9200 34.7 29.4 119 35.8 24.2 148
GRAVE SPRINGS 8550 10.5 10.7 99 13.5 11.0 123
KIRWIN 9550 13.7 11.2 123 15.2 12.0 127
MARQUETTE 8760 10.5 8.9 120 11.1 11.5 98
MIDDLE POWDER 7760 16.7 13.7 122 19.7 13.4 149
OWL CREEK 8975 7.1 4.8 148 7.3 7.1 103
POWDER RIVER PASS 9480 12.5 11.7 106 16.4 13.0 127
SHELL CREEK 9580 17.7 16.4 109 16.2 14.5 112
SYLVAN LAKE 8420 27.4 24.0 114 29.2 20.9 141
SYLVAN ROAD 8120 17.7 11.0 163 20.4 17.4 117
TIMBER CREEK 7950 6.5 6.8 96 8.9 8.5 104
YOUNTS PEAK 8350 22.4 18.4 122 20.0 18.0 112
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Basin wide percent of average 115 123
SHOSHONE RIVER
BLACKWATER 9780 31.9 24.9 129 26.2 19.4 136
EVENING STAR 9200 34.7 29.4 119 35.8 24.2 148
KIRWIN 9550 13.7 11.2 123 15.2 12.0 127
MARQUETTE 8760 10.5 8.9 120 11.1 11.5 98
SYLVAN LAKE 8420 27.4 24.0 114 29.2 20.9 141
SYLVAN ROAD 8120 17.7 11.0 163 20.4 17.4 117
YOUNTS PEAK 8350 22.4 18.4 122 20.0 18.0 112
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Basin wide percent of average 124 129
POWDER-TONGUE
BEAR TRAP MEADOW 7900 3.5 7.0 50 11.0 9.5 116
BIG GOOSE 7990 9.5 -M * 13.0 -M *
BONE SPRINGS DIV 9350 20.2 18.2 111 18.4 16.7 111
BURGESS JUNCTION 7880 11.5 13.0 89 13.0 13.0 101
CLOUD PEAK RESERVOIR 9860 19.0 16.9 113 16.9 15.1 112
DOME LAKE 8880 -M 15.0 * 13.2 14.7 90
GRAVE SPRINGS 8550 10.5 10.7 99 13.5 11.0 123
HANSEN SAWMILL 8760 5.0 7.8 64 10.0 9.1 110
MIDDLE POWDER 7760 16.7 13.7 122 19.7 13.4 149
POWDER RIVER PASS 9480 12.5 11.7 106 16.4 13.0 127
SUCKER CREEK 8880 13.0 13.5 98 15.6 14.7 107
TIE CREEK 6870 -M -M * -M 12.5 *
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Basin wide percent of average 100 114
BELLE FOURCHE
BLIND PARK 6890 6.3 11.7 54 16.9 11.9 143
NORTH RAPID CREEK 6130 6.5 -M * 14.6 -M *
WARREN PEAK 6520 12.2 11.7 105 11.4 9.1 125
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Basin wide percent of average 80 135
UPPER N. PLATTE RIVER
COLUMBINE 9400 18.4 24.5 75 23.4 26.2 89
DIVIDE PEAK 8800 22.2 21.9 102 26.9 25.0 108
ELK RIVER 8700 17.0 20.4 84 23.7 20.7 116
JOE WRIGHT 10120 21.2 24.4 88 27.9 27.5 102
NORTH FRENCH CREEK 10100 33.8 28.4 120 32.0 25.7 125
OLD BATTLE 10000 32.7 35.9 91 38.9 32.8 119
SOUTH BRUSH CREEK 8400 11.2 13.1 86 20.7 18.4 113
TOWER 10500 47.4 49.2 97 40.9 39.5 104
WEBBER SPRINGS 9200 20.7 28.7 73 28.7 27.9 104
WILLOW CREEK PASS 9540 13.0 13.6 96 12.6 14.0 91
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Basin wide percent of average 92 107
LOWER N. PLATTE - SWEETWATER - LARAMIE
BROOKLYN LAKE 10240 15.2 29.2 53 24.2 21.5 113
CASPER MTN. 7900 15.2 19.2 80 19.9 16.4 122
DEADMAN HILL 10220 17.0 17.9 95 18.4 18.9 98
DEER PARK 9700 18.7 -M * 24.4 -M *
LAPRELE CREEK 8320 -M 10.1 * 16.7 13.2 127
RENO HILL 8400 17.4 15.6 112 21.9 20.7 106
ROACH 9700 17.5 18.2 97 22.2 23.4 95
SAND LAKE 10080 39.0 35.8 109 31.4 22.5 140
SOUTH PASS 9040 19.9 17.7 113 21.4 18.9 114
WINDY PEAK 7840 7.5 9.5 80 14.5 10.9 134
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Basin wide percent of average 92 115
LITTLE SNAKE RIVER
BATTLE MOUNTAIN 7440 12.0 11.0 109 19.0 16.9 114
DIVIDE PEAK 8800 22.2 21.9 102 26.9 25.0 108
OLD BATTLE 10000 32.7 35.9 91 38.9 32.8 119
SANDSTONE RS 8150 13.9 15.5 90 22.2 20.7 108
WHISKEY PARK 8950 29.0 30.9 95 31.9 31.0 103
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Basin wide percent of average 96 110
UPPER GREEN RIVER
BIG SANDY OPENING 9100 16.7 15.5 108 16.2 17.5 93
BLIND BULL SUM 8650 28.4 31.2 92 23.4 25.7 91
EAST RIM DIVIDE 7930 14.7 15.1 98 14.9 16.4 91
ELKHART PARK G.S. 9400 15.2 15.1 101 15.7 17.2 92
GROS VENTRE SUMMIT 8775 17.0 16.0 107 16.9 17.2 98
KENDALL R.S. 7740 16.0 13.2 121 17.4 16.7 104
LOOMIS PARK 8240 -M 17.0 * 21.2 20.4 105
NEW FORK LAKE 8340 13.6 10.9 126 12.6 15.6 81
SNIDER BASIN 8250 18.7 15.6 120 18.7 16.4 115
SPRING CREEK DIVIDE 9000 32.3 29.5 110 30.0 29.4 103
TRIPLE PEAK 8500 30.4 27.0 113 31.9 33.3 96
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Basin wide percent of average 108 97
LOWER GREEN RIVER
HAMS FORK 7840 14.0 5.8 242 12.5 14.5 86
HEWINTA 9500 12.6 9.1 139 15.5 14.6 106
HICKERSON PARK 9150 5.8 6.8 87 10.5 11.0 97
HOLE-IN-ROCK 9150 7.1 6.3 113 11.0 11.0 100
INDIAN CREEK 9425 32.0 30.5 105 26.9 27.9 97
KELLEY R.S. 8180 17.7 17.7 100 20.0 20.2 100
STEEL CREEK PARK 10100 16.0 18.0 89 17.9 14.5 125
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Basin wide percent of average 112 101
UPPER BEAR RIVER
BUG LAKE 7950 24.0 20.2 120 21.7 21.2 103
HAYDEN FORK 9400 15.0 11.0 137 21.9 21.0 104
KELLEY R.S. 8180 17.7 17.7 100 20.0 20.2 100
LILY LAKE 9050 12.7 13.0 98 19.2 16.4 118
MONTE CRISTO 8960 27.2 29.4 93 28.0 27.9 101
SALT RIVER SUMMIT 7600 16.7 14.0 120 19.4 18.2 107
TRIAL LAKE 9960 22.4 26.2 86 23.4 26.2 90
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Basin wide percent of average 104 102
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-M = Missing data
* = Data may not provide a valid measure of conditions.
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.