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Water Resources Data System
Dept 3943
1000 E. University Ave.
Laramie, WY 82071

wrds@uwyo.edu
Ph (307) 766-6651
Fax (307) 766-3785


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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 WEDNESDAY: APRIL 25 , 2018
------------------------------------------------------------------------------
BASIN                    ELEV.  SNOW WATER EQUIVALENT    TOTAL PRECIPITATION
 Data Site Name          (Ft)                      %                      %  
                                Current  Median  Median  Current  Average  Avg
------------------------------------------------------------------------------

WYOMING
 

SNAKE RIVER  

 Base Camp                7060   15.9    10.8    147    24.9    22.1    113 
 Black Bear               8170   46.7    36.9    127    45.4    40.7    112 
 Blind Bull Sum           8650   37.5    24.3    154    22.0    20.7    106 
 Cottonwood Creek         7670   21.5    17.3    124    30.1    26.5    114 
 East Rim Divide          7930    7.8     9.0     87    13.5    12.4    109 
 Grand Targhee            9260   54.7    43.1    127    37.8    33.5    113 
 Granite Creek            6770   14.2     9.5    149    24.1    20.6    117 
 Grassy Lake              7265   32.1    30.2    106    39.9    38.2    104 
 Gros Ventre Summit       8750   16.0    12.5    128    17.0    14.0    121 
 Gunsight Pass            9820   18.6    13.5    138    18.8    15.4    122 
 Lewis Lake Divide        7850   44.9    30.7    146      -M    37.5       *
 Phillips Bench           8200   32.7    25.4    129    32.3    29.8    108 
 Salt River Summit        7640    6.7     8.5     79    14.4    17.8     81 
 Snake River Station      6920   15.0    10.1    149    26.3    24.0    110 
 Spring Creek Divide      9000   29.1    23.7    123    27.3    25.4    107 
 Thumb Divide             7980   18.4    14.2    130    21.5    20.2    106 
 Togwotee Pass            9580   36.0    24.4    148    37.4    26.3    142 
 Two Ocean Plateau        9240   43.6    29.0    150    34.0    29.2    116 
 Willow Creek             8080   36.4    25.7    142    40.9    36.3    113 
 Younts Peak              8350     -M    15.1       *     -M    17.0       *
                                                -----                  -----
                Basin Index (%)                  132                    112 
 

MADISON-GALLATIN

 Black Bear               8170   46.7    36.9    127    45.4    40.7    112 
 Canyon                   7870   18.3    11.7    156    21.6    17.4    124 
 Madison Plateau          7750   30.3    22.6    134    30.5    28.0    109 
 West Yellowstone         6700    8.8     5.1    173    19.3    15.4    125 
 Whiskey Creek            6800   16.3    15.5    105    22.3    21.7    103 
                                                -----                  -----
                Basin Index (%)                  131                    113 
 

YELLOWSTONE

 Beartooth Lake           9360   42.3    23.6    179    39.0    21.2    184 
 Burnt Mtn                5880    5.9      .0       *   17.2    14.9    115 
 Canyon                   7870   18.3    11.7    156    21.6    17.4    124 
 Cole Creek               7850   17.1    16.3    105    14.4    15.2     95 
 Evening Star             9200   45.2    24.5    184      -M    29.4       *
 Fisher Creek             9100   57.1    33.2    172    51.8    34.1    152 
 Northeast Entrance       7350   13.0     5.1    255    20.2    13.3    152 
 Parker Peak              9400   39.2    21.8    180    33.3    19.3    173 
 Sylvan Lake              8420   27.1    20.3    133    31.4    24.2    130 
 Thumb Divide             7980   18.4    14.2    130    21.5    20.2    106 
 Two Ocean Plateau        9240   43.6    29.0    150    34.0    29.2    116 
 White Mill               8700   45.6    23.8    192    35.6    25.4    140 
 Wolverine                7650   21.7     5.6    388    23.4    13.2    177 
                                                -----                  -----
                Basin Index (%)                  172                    139 
 

WIND RIVER

 Burroughs Creek          8750   15.5      -M       *   19.7      -M       *
 Castle Creek             8400    4.9      -M       *   10.8      -M       *
 Cold Springs             9630    7.1     3.1    229    10.8    11.6     93 
 Deer Park                9700   12.0    16.3     74    16.5    22.7     73 
 Hobbs Park              10100   18.7    15.6    120    16.4    15.7    104 
 Kirwin                   9550   19.3    10.1    191    20.1    13.0    155 
 Little Warm              9370   16.8     9.5    177    19.2    14.5    132 
 Owl Creek                8975    1.9     2.7     70     7.4     7.3    101 
 South Pass               9040   11.1    15.2     73      -M    19.4       *
 St. Lawrence Alt         8620     -M     4.9       *    9.0    10.6     85 
 Togwotee Pass            9580   36.0    24.4    148    37.4    26.3    142 
 Townsend Creek           8700    5.4     8.8     61     9.9    14.1     70 
                                                -----                  -----
                Basin Index (%)                  121                    108 
 

BIGHORN BASIN

 Bald Mtn.                9380   24.5    20.4    120    18.9    18.7    101 
 Bear Trap Meadow         8200    8.7     2.0    435    11.9     9.9    120 
 Bone Springs Div         9350   22.6    16.4    138    17.4    17.3    101 
 Grave Springs            8550    8.0     9.2     87      -M    12.2       *
 Kirwin                   9550   19.3    10.1    191    20.1    13.0    155 
 Marquette                8760    6.9      -M       *   11.6      -M       *
 Middle Powder            7760   11.0    12.3     89      -M    13.3       *
 Owl Creek                8975    1.9     2.7     70     7.4     7.3    101 
 Powder River Pass        9480   16.5    10.2    162    17.4    14.2    123 
 Shell Creek              9580   23.6    15.8    149    18.3    15.3    120 
 Timber Creek             7950     .0     3.7      0      -M     9.0       *
                                                -----                  -----
                Basin Index (%)                  132                    116 
 

SHOSHONE RIVER

 Blackwater               9780   37.7    24.4    155    35.6    22.5    158 
 Evening Star             9200   45.2    24.5    184      -M    29.4       *
 Marquette                8760    6.9      -M       *   11.6      -M       *
 Sylvan Road              7120   12.3     8.3    148    25.0    17.9    140 
 Younts Peak              8350     -M    15.1       *     -M    17.0       *
                                                -----                  -----
                Basin Index (%)                  166                    150*
 

POWDER RIVER

 Bear Trap Meadow         8200    8.7     2.0    435    11.9     9.9    120 
 Cloud Peak Reservoir     9860   17.8    16.3    109    16.5    15.6    106 
 Grave Springs            8550    8.0     9.2     87      -M    12.2       *
 Hansen Sawmill           8360    8.8     4.3    205    11.9    10.1    118 
 Middle Powder            7760   11.0    12.3     89      -M    13.3       *
 Powder River Pass        9480   16.5    10.2    162    17.4    14.2    123 
 Soldier Park             8720    6.9      -M       *   11.6      -M       *
                                                -----                  -----
                Basin Index (%)                  130                    116 
 

TONGUE RIVER

 Big Goose                7990    9.6     9.1    105    10.9    13.4     81 
 Bone Springs Div         9350   22.6    16.4    138    17.4    17.3    101 
 Burgess Junction         7880   11.9    12.4     96    10.6    13.9     76 
 Dome Lake                8880   16.6    11.8    141    14.8    15.4     96 
 Little Goose             8870   11.3      -M       *   14.8      -M       *
 Sucker Creek             8880   12.8    12.7    101    11.8    16.4     72 
 Tie Creek                6870    4.3     3.5    123    11.3    13.6     83 
                                                -----                  -----
                Basin Index (%)                  118                     85 
 

BELLE FOURCHE

 Cole Canyon              5910    5.8      .8    725    12.4    10.9    114 
                                                -----                  -----
                Basin Index (%)                  725                    114 
 

CHEYENNE RIVER BASIN

 Blind Park               6890    5.5     3.6    153    13.4    13.6     99 
 North Rapid Creek        6130    4.2     3.5    120    10.7    11.6     92 
                                                -----                  -----
                Basin Index (%)                  137                     96 
 

UPPER N. PLATTE

 Arapaho Ridge           10960   23.7    21.8    109    23.8    25.4     94 
 Blackhall Mtn            9820   29.0      -M       *   29.9      -M       *
 Columbine                9160   23.0    20.6    112    28.5    27.7    103 
 Divide Peak              8880   12.4    18.1     69    20.1    23.5     86 
 Joe Wright              10120   23.3    23.2    100    33.8    28.8    117 
 Laprele Creek            8375    4.3     7.3     59     9.5    14.3     66 
 Med Bow                 10500   45.1      -M       *   37.8      -M       *
 North French Creek      10130   30.8    32.6     94    31.1    29.5    105 
 Never Summer            10280   22.7    21.1    108    18.8      -M       *
 Old Battle              10000   28.0    34.1     82    26.5    37.9     70 
 Rawah                    9020    9.4     8.0    118    17.0    16.6    102 
 Sage Creek Basin         7850     -M     2.7       *   11.4    15.6     73 
 Sand Lake               10050   30.1    31.0     97    26.1    27.9     94 
 South Brush Creek        8440    6.1    10.0     61    13.4    17.0     79 
 Tower                   10500   45.0    49.3     91      -M    43.3       *
 Webber Springs           9250   17.4    21.9     79    23.7    29.0     82 
 Willow Creek Pass        9540   15.0    13.7    109    16.3    15.1    108 
 Zirkel                   9340   23.5    22.3    105    34.4    30.3    114 
                                                -----                  -----
                Basin Index (%)                   94                     93 
 

SWEETWATER

 Deer Park                9700   12.0    16.3     74    16.5    22.7     73 
 Larsen Creek             9000    7.6     9.8     78    12.0      -M       *
 South Pass               9040   11.1    15.2     73      -M    19.4       *
                                                -----                  -----
                Basin Index (%)                   74                     73*
 

LOWER N. PLATTE

 Casper Mtn.              7900    8.0    14.2     56     8.0    17.1     47 
 Laprele Creek            8375    4.3     7.3     59     9.5    14.3     66 
 Reno Hill                8400   10.7    13.8     78    13.4    17.9     75 
 Windy Peak               7900    4.8     6.1     79     9.7    12.3     79 
                                                -----                  -----
                Basin Index (%)                   67                     66 
 

LARAMIE RIVER

 Brooklyn Lake           10240   26.8    22.8    118    28.3    23.7    119 
 Cinnabar Park            9574   21.8    20.0    109    27.2    26.1    104 
 Crow Creek               8330     .5      .0       *   12.4    12.8     97 
 Deadman Hill            10220   22.9    18.1    127    22.0    19.8    111 
 Rawah                    9020    9.4     8.0    118    17.0    16.6    102 
 Roach                    9700   14.2    16.8     85    19.2    21.4     90 
                                                -----                  -----
                Basin Index (%)                  112                    105 
 

S. PLATTE

 Black Mountain           8920    9.6      -M       *   14.8      -M       *
 Crow Creek               8330     .5      .0       *   12.4    12.8     97 
 Deadman Hill            10220   22.9    18.1    127    22.0    19.8    111 
                                                -----                  -----
                Basin Index (%)                  129*                   106 
 

LITTLE SNAKE RIVER

 Battle Mountain          7440     .0     1.9      0    11.8    16.5     72 
 Divide Peak              8880   12.4    18.1     69    20.1    23.5     86 
 Elk River                8700   11.4    14.6     78    18.6    21.9     85 
 Little Snake River       8915   19.7    23.3     85    30.5    31.7     96 
 Old Battle              10000   28.0    34.1     82    26.5    37.9     70 
 Sage Creek Basin         7850     -M     2.7       *   11.4    15.6     73 
 Sandstone RS             8150    3.6     8.6     42    10.9    20.1     54 
 Whiskey Park             8950   23.8    25.6     93    28.6    30.4     94 
                                                -----                  -----
                Basin Index (%)                   78                     80 
 

UPPER GREEN RIVER

 Big Sandy Opening        9080   12.2    12.1    101    14.0    14.6     96 
 Blind Bull Sum           8650   37.5    24.3    154    22.0    20.7    106 
 East Rim Divide          7930    7.8     9.0     87    13.5    12.4    109 
 Elkhart Park G.S.        9400   12.6    11.8    107    13.1    14.4     91 
 Gros Ventre Summit       8750   16.0    12.5    128    17.0    14.0    121 
 Gunsight Pass            9820   18.6    13.5    138    18.8    15.4    122 
 Kendall R.S.             7740    9.9     6.6    150    16.9    15.0    113 
 Loomis Park              8240   15.4    11.9    129    20.3    18.3    111 
 New Fork Lake            8340    7.7     7.4    104    12.5    11.6    108 
 Pocket Creek             9360    9.5      -M       *   10.0      -M       *
 Snider Basin             8060    5.9    10.1     58    15.9    15.1    105 
 Spring Creek Divide      9000   29.1    23.7    123    27.3    25.4    107 
 Triple Peak              8500   33.6    19.0    177    35.1    27.0    130 
                                                -----                  -----
                Basin Index (%)                  127                    111 
 

LOWER GREEN RIVER

 Blacks Fork Jct          8869    2.8      -M       *   10.5      -M       *
 Buck Pasture             9632   10.8      -M       *   15.5      -M       *
 EF Blacks Fork GS        9360    7.6      -M       *     -M      -M       *
 Hams Fork                7840    3.8     5.0     76    11.6    12.5     93 
 Hewinta                  9500    4.5     6.9     65    12.8    15.5     83 
 Hickerson Park           9122     .7     5.0     14     9.0    11.5     78 
 Hole-in-Rock             9168    3.1     5.0     62     9.5    11.0     86 
 Indian Creek             9425   23.5    23.7     99    18.1    24.2     75 
 Kelley R.S.              8180   11.4    11.9     96    16.2    19.5     83 
 Spirit Lk               10235    9.7      -M       *   13.5      -M       *
 Steel Creek Park        10158   15.4    16.5     93    16.2    18.4     88 
                                                -----                  -----
                Basin Index (%)                   84                     83 
 

UPPER BEAR RIVER

 Bear River RS            8777     .0      -M       *   11.6      -M       *
 Bug Lake                 7987   12.3    16.2     76    18.0    20.9     86 
 Burts Miller Ranch       8000     .4      -M       *    6.7      -M       *
 Chalk Creek #1           9171   12.9    24.6     52    18.0    27.5     65 
 Hayden Fork              9130    3.7    10.7     35    18.0    22.9     79 
 Kelley R.S.              8180   11.4    11.9     96    16.2    19.5     83 
 Lily Lake                9133    7.1     9.9     72    12.5    18.8     66 
 Monte Cristo             8932   22.3    27.4     81    24.5    28.2     87 
 Salt River Summit        7640    6.7     8.5     79    14.4    17.8     81 
                                                -----                  -----
                Basin Index (%)                   70                     78 
----------------------------------------------------------------------------

 -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.