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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 SUNDAY: MAY 21 , 2017
------------------------------------------------------------------------------
BASIN                    ELEV.  SNOW WATER EQUIVALENT    TOTAL PRECIPITATION
 Data Site Name          (Ft)                      %                      %  
                                Current  Median  Median  Current  Average  Avg
------------------------------------------------------------------------------

WYOMING
 

SNAKE RIVER  

 Base Camp                7030    7.6      .0       *   43.2    24.6    176 
 Black Bear               8170   45.4    33.2    137    61.7    44.7    138 
 Blind Bull Sum           8650     -M    19.4       *   39.6    23.3    170 
 Cottonwood Creek         7670   18.4     5.4    341    45.0    30.0    150 
 East Rim Divide          7930     .0      .0       *   23.5    14.2    165 
 Grand Targhee            9260   55.3    41.8    132    52.9    36.8    144 
 Granite Creek            6770    6.2      .0       *   38.7    23.0    168 
 Grassy Lake              7265   25.1    16.4    153    62.5    41.9    149 
 Gros Ventre Summit       8750     -M     4.9       *     -M    16.2       *
 Gunsight Pass            9820   20.5     9.9    207    29.6    17.7    167 
 Lewis Lake Divide        7850   34.9    21.7    161    60.1    41.1    146 
 Phillips Bench           8200   31.8    18.4    173    51.3    33.0    155 
 Salt River Summit        7760    3.3      .0       *   32.7    20.0    164 
 Snake River Station      6920     .0      .0       *   39.6    26.6    149 
 Spring Creek Divide      9000   37.9    19.7    192    45.8    28.1    163 
 Thumb Divide             7980    3.9      .8    488*   31.2    22.8    137 
 Togwotee Pass            9580   33.0    22.9    144    44.5    29.8    149 
 Two Ocean Plateau        9240     -M    28.2       *     -M    33.0       *
 Willow Creek             8380     -M    15.8       *   59.4    41.0    145 
 Younts Peak              8350    1.4    11.5     12    33.6    19.6    171 
                                                -----                  -----
                Basin Index (%)                  161                    153 
 

MADISON-GALLATIN

 Black Bear               8170   45.4    33.2    137    61.7    44.7    138 
 Canyon                   7870    8.4     1.6    525    29.7    19.9    149 
 Madison Plateau          7750   19.1    13.8    138    41.4    31.6    131 
 West Yellowstone         6700     .1      .0       *   26.8    17.6    152 
 Whiskey Creek            6800    4.1     5.0     82    30.5    24.4    125 
                                                -----                  -----
                Basin Index (%)                  144                    138 
 

YELLOWSTONE

 Beartooth Lake           9360   33.8    21.4    158    32.8    24.2    136 
 Burnt Mtn                5880    2.2      .0       *   23.3    19.2    121 
 Canyon                   7870    8.4     1.6    525    29.7    19.9    149 
 Cole Creek               7850   16.1    15.8    102    19.3    19.6     98 
 Evening Star             9200   35.4    23.4    151    50.9    33.4    152 
 Fisher Creek             9100   48.9    32.5    150    53.4    38.5    139 
 Northeast Entrance       7350     .0      .0       *   23.8    15.6    153 
 Parker Peak              9400   35.3    19.6    180    41.5    22.5    184 
 Sylvan Lake              8420   16.5    14.7    112    43.5    27.7    157 
 Thumb Divide             7980    3.9      .8    488*   31.2    22.8    137 
 Two Ocean Plateau        9240     -M    28.2       *     -M    33.0       *
 White Mill               8700   32.9    21.9    150    40.7    29.0    140 
 Wolverine                7650     -M      .0       *   24.8    15.6    159 
                                                -----                  -----
                Basin Index (%)                  154                    144 
 

WIND RIVER

 Burroughs Creek          8750    8.5      -M       *   29.7      -M       *
 Castle Creek             8400     .0      -M       *   18.5      -M       *
 Cold Springs             9630    6.7      .0       *   24.4    14.4    169 
 Deer Park                9700   31.5    10.0    315    46.0    26.0    177 
 Hobbs Park              10100   31.7    12.7    250    36.9    19.4    190 
 Kirwin                   9550   19.8     8.0    248    30.6    15.9    192 
 Little Warm              9370   11.8     2.1    562    28.1    17.4    161 
 Owl Creek                8975     .8      .0       *   16.9     9.7    174 
 South Pass               9040   29.7     5.8    512    35.9    22.5    160 
 St. Lawrence Alt         8620    1.5      .0       *   22.4    13.5    166 
 Togwotee Pass            9580   33.0    22.9    144    44.5    29.8    149 
 Townsend Creek           8700   13.3      .0       *   30.6    17.2    178 
                                                -----                  -----
                Basin Index (%)                  292                    170 
 

BIGHORN BASIN

 Bald Mtn.                9380   20.7    18.8    110    22.9    22.1    104 
 Bear Trap Meadow         8200     .1      .0       *   16.7    12.6    133 
 Bone Springs Div         9350   18.0    14.0    129    23.0    20.9    110 
 Grave Springs            8550    4.9     1.9    258    15.2    15.1    101 
 Kirwin                   9550   19.8     8.0    248    30.6    15.9    192 
 Marquette                8760   16.1      -M       *   26.2      -M       *
 Middle Powder            7760    4.0     4.4     91    15.2    16.3     93 
 Owl Creek                8975     .8      .0       *   16.9     9.7    174 
 Powder River Pass        9480    3.6     4.7     77    18.9    17.3    109 
 Shell Creek              9580   14.2    14.9     95    19.3    18.5    104 
 Timber Creek             7950    2.2      .0       *   17.8    12.2    146 
                                                -----                  -----
                Basin Index (%)                  132                    122 
 

SHOSHONE RIVER

 Blackwater               9780   40.0    24.0    167    48.2    26.1    185 
 Evening Star             9200   35.4    23.4    151    50.9    33.4    152 
 Marquette                8760   16.1      -M       *   26.2      -M       *
 Sylvan Road              7120     .0      .0       *   33.3    20.3    164 
 Younts Peak              8350    1.4    11.5     12    33.6    19.6    171 
                                                -----                  -----
                Basin Index (%)                  130                    167 
 

POWDER RIVER

 Bear Trap Meadow         8200     .1      .0       *   16.7    12.6    133 
 Cloud Peak Reservoir     9860   18.0    14.3    126    28.1    19.7    143 
 Grave Springs            8550    4.9     1.9    258    15.2    15.1    101 
 Hansen Sawmill           8360    6.9      .0       *   18.8    13.0    145 
 Middle Powder            7760    4.0     4.4     91    15.2    16.3     93 
 Powder River Pass        9480    3.6     4.7     77    18.9    17.3    109 
 Soldier Park             8720    8.3      -M       *   22.3      -M       *
                                                -----                  -----
                Basin Index (%)                  148                    120 
 

TONGUE RIVER

 Big Goose                7990    8.4     3.8    221    21.1    17.2    123 
 Bone Springs Div         9350   18.0    14.0    129    23.0    20.9    110 
 Burgess Junction         7880    6.4     7.6     84    17.0    17.0    100 
 Dome Lake                8880   13.9     5.4    257    24.3    19.1    127 
 Little Goose             8870   11.5      -M       *   25.4      -M       *
 Sucker Creek             8880   10.5     8.1    130    20.9    20.3    103 
 Tie Creek                6870    2.2      .0       *   24.2    17.3    140 
                                                -----                  -----
                Basin Index (%)                  153                    117 
 

BELLE FOURCHE

 Cole Canyon              5910     .0      .0       *   13.3    14.9     89 
                                                -----                  -----
                Basin Index (%)                     *                    89 
 

CHEYENNE RIVER BASIN

 Blind Park               6890     .0      .0       *   13.8    16.7     83 
 North Rapid Creek        6130     .0      .0       *   12.1    14.6     83 
                                                -----                  -----
                Basin Index (%)                     *                    83 
 

UPPER N. PLATTE

 Arapaho Ridge           10960   21.2    17.3    123    31.9    28.5    112 
 Blackhall Mtn            9820   28.8      -M       *   43.6      -M       *
 Columbine                9160     .9     1.7     53*   34.1    30.7    111 
 Divide Peak              8880     .8     4.7     17    27.4    26.5    103 
 Joe Wright              10120   15.0    20.7     72    36.1    33.0    109 
 Laprele Creek            8375     .8      .0       *   17.0    17.0    100 
 Med Bow                 10500   35.7      -M       *   42.4      -M       *
 North French Creek      10130   21.8    28.9     75    35.4    33.8    105 
 Never Summer            10280   21.3    19.7    108    24.3      -M       *
 Old Battle              10000   37.0    32.2    115    44.7    42.2    106 
 Rawah                    9020     .4      .4    100*   21.5    18.9    114 
 Sage Creek Basin         7850     -M      .0       *   18.9    17.4    109 
 Sand Lake               10050   30.7    27.4    112    34.0    32.0    106 
 South Brush Creek        8440     .0      .0       *   16.1    20.2     80 
 Tower                   10500   40.4    47.3     85    54.4    47.9    114 
 Webber Springs           9250   11.8    10.9    108    38.7    32.1    121 
 Willow Creek Pass        9540   12.3     8.8    140    22.0    17.4    126 
 Zirkel                   9340   11.0     8.1    136    49.1    33.4    147 
                                                -----                  -----
                Basin Index (%)                   99                    112 
 

SWEETWATER

 Deer Park                9700   31.5    10.0    315    46.0    26.0    177 
 Larsen Creek             9000     .8     3.3     24    27.4      -M       *
 South Pass               9040   29.7     5.8    512    35.9    22.5    160 
                                                -----                  -----
                Basin Index (%)                  325                    169 
 

LOWER N. PLATTE

 Casper Mtn.              7900    2.0     3.6     56    20.9    20.5    102 
 Laprele Creek            8375     .8      .0       *   17.0    17.0    100 
 Reno Hill                8400    2.1     2.6     81    21.1    21.5     98 
 Windy Peak               7900    1.6      .0       *   17.7    14.9    119 
                                                -----                  -----
                Basin Index (%)                  105                    104 
 

LARAMIE RIVER

 Brooklyn Lake           10240   12.8    15.5     83    28.6    27.3    105 
 Cinnabar Park            9574    6.5    11.5     57    28.9    29.6     98 
 Crow Creek               8330     -M      .0       *   15.5    15.2    102 
 Deadman Hill            10220   16.4    16.0    102    28.2    23.1    122 
 Rawah                    9020     .4      .4    100*   21.5    18.9    114 
 Roach                    9700    9.2    10.8     85    27.7    24.7    112 
                                                -----                  -----
                Basin Index (%)                   84                    108 
 

S. PLATTE

 Black Mountain           8920    2.4      -M       *   20.1      -M       *
 Crow Creek               8330     -M      .0       *   15.5    15.2    102 
 Deadman Hill            10220   16.4    16.0    102    28.2    23.1    122 
                                                -----                  -----
                Basin Index (%)                  102*                   114 
 

LITTLE SNAKE RIVER

 Battle Mountain          7440     .0      .0       *   20.5    18.6    110 
 Divide Peak              8880     .8     4.7     17    27.4    26.5    103 
 Elk River                8700     .4      .0       *   24.4    24.6     99 
 Little Snake River       8915   12.1    12.2     99    44.8    35.2    127 
 Old Battle              10000   37.0    32.2    115    44.7    42.2    106 
 Sage Creek Basin         7850     -M      .0       *   18.9    17.4    109 
 Sandstone RS             8150     .0      .0       *   19.4    22.5     86 
 Whiskey Park             8950   17.9    20.9     86    36.9    33.9    109 
                                                -----                  -----
                Basin Index (%)                   97                    107 
 

UPPER GREEN RIVER

 Big Sandy Opening        9080   13.2     2.2    600    27.0    16.9    160 
 Blind Bull Sum           8650     -M    19.4       *   39.6    23.3    170 
 East Rim Divide          7930     .0      .0       *   23.5    14.2    165 
 Elkhart Park G.S.        9400   12.5     5.2    240    27.7    16.8    165 
 Gros Ventre Summit       8750     -M     4.9       *     -M    16.2       *
 Gunsight Pass            9820   20.5     9.9    207    29.6    17.7    167 
 Kendall R.S.             7740     .0      .0       *   31.8    16.8    189 
 Loomis Park              8240   13.4     1.9    705    35.4    20.6    172 
 New Fork Lake            8340     -M      .0       *   21.6    13.6    159 
 Pocket Creek             9360     -M      -M       *     -M      -M       *
 Snider Basin             8060     -M      .0       *   29.6    16.8    176 
 Spring Creek Divide      9000   37.9    19.7    192    45.8    28.1    163 
 Triple Peak              8500   23.7     7.4    320    45.5    30.3    150 
                                                -----                  -----
                Basin Index (%)                  262*                   166 
 

LOWER GREEN RIVER

 Blacks Fork Jct          8869     .0      -M       *   19.6      -M       *
 Buck Pasture             9632    4.6      -M       *   28.2      -M       *
 EF Blacks Fork GS        9360     -M      -M       *   23.6      -M       *
 Hams Fork                7840     .0      .0       *   24.8    14.4    172 
 Hewinta                  9500     .0      .0       *   21.7    17.8    122 
 Hickerson Park           9122     .2      .0       *   16.0    13.5    119 
 Hole-in-Rock             9168     .0      .0       *   16.7    13.1    127 
 Indian Creek             9425   35.8    17.8    201    46.7    27.1    172 
 Kelley R.S.              8180    7.7     2.1    367    35.3    21.8    162 
 Spirit Lk               10235    4.3      -M       *   22.2      -M       *
 Steel Creek Park        10158   15.9    14.2    112    26.2    21.1    124 
                                                -----                  -----
                Basin Index (%)                  175*                   145 
 

UPPER BEAR RIVER

 Bear River RS            8777     .0      -M       *   21.9      -M       *
 Bug Lake                 7987   20.6     3.8    542    38.8    23.6    164 
 Burts Miller Ranch       8000     .0      -M       *   12.2      -M       *
 Chalk Creek #1           9171   23.7    14.6    162    42.1    30.9    136 
 Hayden Fork              9130     .1      .0       *   33.0    25.9    127 
 Kelley R.S.              8180    7.7     2.1    367    35.3    21.8    162 
 Lily Lake                9133     .0      .0       *   23.5    21.4    110 
 Monte Cristo             8932   28.1    13.9    202    46.3    31.6    147 
 Salt River Summit        7760    3.3      .0       *   32.7    20.0    164 
                                                -----                  -----
                Basin Index (%)                  243*                   144 

-----------------------------------------------------------------------------


 -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.