B A S I N   S U M M A R Y   OF
                        S N O W    C O U R S E    D A T A
                                     MAY   1999


      SNOW COURSE         ELEVATION    DATE    SNOW   WATER     LAST   AVERAGE
                                              DEPTH  CONTENT    YEAR   1961-90
-------------------------------------------------------------------------------
 
   SNAKE RIVER BASIN                                          
      ASTER CREEK            7750                                ---      ---
      BASE CAMP PILLOW       7030    5/01/99   ---     17.0     10.9     10.7
      BASE CAMP              7030                                ---      ---
      BLACK BEAR PILLOW      7950    5/01/99   ---     52.2     38.9     39.8
      BLIND BULL PILLOW      8900    5/01/99   ---     32.5     24.0     22.7
      BRYAN FLAT             6420    4/25/99    16      6.7      5.7      2.3
      CCC CAMP               7000    4/28/99    27     12.1      8.6      7.9
      COTTONWOOD CR PILLOW   7700    5/01/99   ---     23.0     16.5     20.0
      DARBY CANYON           8250    5/05/99    62     24.3     24.6     23.9
      EAST RIM DIV PILLOW    7930    5/01/99   ---     15.0     12.3     14.8
      ELBO RANCH             7100    4/28/99    32     12.4     13.4      9.0
      FOUR MILE MEADOWS      7860                                ---      ---
      GLADE CREEK            7040    4/29/99    52     25.4     19.8     21.0
      GRASSY LAKE PILLOW     7270    5/01/99   ---     41.3     29.1     33.9
      GREYS BOUNDARY         5720    4/28/99     2       .9      3.5      2.6
      GROS VENTRE PILLOW     8750    5/01/99   ---     16.8     15.3     13.9
      GROVER PARK DIVIDE     7000    4/28/99    12      5.5      5.1      7.9
      HUCKLEBERRY DIVIDE     7300                                ---      ---
      JACKPINE CREEK         7350    5/05/99    54     21.8     20.6     19.8
      LEWIS LAKE PILLOW      7850    5/01/99   ---     39.4     29.4     34.4
      LEWIS LAKE DIVIDE      7850                               31.7     42.0
      MORAN                  6750                                ---      ---
      PHILLIPS BENCH PILL.   8200    5/01/99   ---     36.1     27.0     29.5
      POISON MEADOWS         8500                                ---     29.9
      SALT RIVER PILLOW      7600    5/01/99   ---     14.4     11.3     10.8
      SNAKE RIVER STATION    6920                                ---      ---
      SNOW KING MTN          7660    4/26/99    32     12.7     12.8     12.4
      SPRING CRK. PILLOW     9000    5/01/99   ---     36.0     22.1     29.6
      TETON PASS W.S.        7740    4/26/99    76     32.6     30.4     27.1
      THUMB DIVIDE           7980                                ---      ---
      TOGWOTEE PASS PILLOW   9580    5/01/99   ---     32.1     25.2     28.3
      TURPIN MEADOWS         6900                                ---      ---
      TWO OCEAN PILLOW       9240    5/01/99   ---     39.6     30.7     29.2
      WILLOW CREEK PILLOW    8450    5/01/99   ---     31.3     23.4     31.9
 
   UPPER YELLOWSTONE & MADISON RIVER BASINS                   
      BLACK BEAR PILLOW      7950    5/01/99   ---     52.2     38.9     39.8
      CANYON PILLOW          8090    5/01/99   ---     16.2     10.4     10.9
      FISHER CREEK PILLOW    9100    5/01/99   ---     39.6     28.3     38.7
      FISHER CREEK           9100                                ---     41.8
      LAKE CAMP              7780    4/28/99    31     10.9      5.4      7.2
      LUPINE CREEK           7380    5/01/99    26      9.6      ---      6.6
      MADISON PLT PILLOW     7750    5/01/99   ---     36.1     20.2     23.8
      MADISON PLATEAU        7750                                ---     22.2
      NORRIS BASIN           7500    5/01/99    18      7.9      6.7      7.5
      N.E. ENTRANCE PILLOW   7350    5/01/99   ---      6.3       .0      5.9
      NORTHEAST ENTRANCE     7350                                ---      6.1
      OLD FAITHFUL           7400    5/03/99    32     14.2      9.9     10.0
      PARKERS PEAK PILLOW    9400    5/01/99   ---     27.4     19.1     23.7
      SYLVAN LAKE PILLOW     8420    5/01/99   ---     25.4     16.3     23.8
      THUMB DIVIDE           7980                                ---      ---
      TWENTY-ONE MILE        7150    5/01/99    33     15.1     12.8     14.8
      TWO OCEAN PILLOW       9240    5/01/99   ---     39.6     30.7     29.2
      WEST YELL'ST PILLOW    6700    5/01/99   ---      7.2      1.6      6.8
      WEST YELLOWSTONE       6700    5/01/99    21      9.0      4.8      7.1
 
   WIND RIVER BASIN                                           
      BLUE RIDGE             9620    5/01/99   ---     19.2E    15.8     12.7
      BURROUGHS CRK PILLOW   8750    5/01/99   ---     19.1     16.1     12.9
      BURROUGHS CREEK        8750                                ---     13.8
      CASTLE CREEK           8400    4/27/99    13      3.7      4.1      2.0
      COLD SPRINGS PILLOW    9630    5/01/99   ---     19.9      9.8      6.8
      DU NOIR                8760    4/28/99    33      8.9      7.9      6.8
      GEYSER CREEK           8500    4/28/99    20      4.9      7.5      5.4
      GRANNIER MEADOWS       8860    5/01/99   ---     21.2E    13.0     15.1
      HOBBS PARK PILLOW     10100    5/01/99   ---     29.1     19.2     18.0
      LITTLE WARM PILLOW     9370    5/01/99   ---     20.3     10.7     10.4
      MIDDLE FORK            7420    4/27/99    52     12.4      8.8      5.0
      SOUTH PASS PILLOW      9040    5/01/99   ---     25.0     15.9     18.1
      ST LAWRENCE ALT PILL   8620    5/01/99   ---     14.6      9.7      5.4
      T CROSS RANCH          7900    4/27/99    14      4.6      3.1      3.6
      TOGWOTEE PASS PILLOW   9580    5/01/99   ---     32.1     25.2     28.3
      TOWNSEND CRK PILLOW    8700    5/01/99   ---     19.7     11.3      9.5
      YOUNTS PEAK PILLOW     8350    5/01/99   ---     21.7     15.6     18.3
 
   BIG HORN RIVER BASIN                                       
      BALD MOUNTAIN PILLOW   9380    5/01/99   ---     21.7     22.2     24.1
      BONE SPGS. PILLOW      9350    5/01/99   ---     20.4     20.1     18.4
      KIRWIN PILLOW          9550    5/01/99   ---     16.8     12.8     11.7
      MEDICINE LODGE LAKES   9340    4/26/99    43     13.2     11.8     12.5
      MIDDLE POWDER PILLOW   7760    5/01/99   ---     16.5     12.1     14.8
      MIDDLE POWDER          7760                                ---     14.0
      ONION GULCH            8780    4/30/99    36      9.9     11.4      8.9
      OWL CREEK PILLOW       8980    5/01/99   ---     11.0      6.5      3.4
      POWDER RVR.PASS PILL   9480    5/01/99   ---     13.1     11.9     10.5
      RANGER CREEK           8120    4/26/99    31      9.8      8.3      8.1
      SHELL CREEK PILLOW     9580    5/01/99   ---     17.9     15.8     17.0
      TIMBER CREEK PILLOW    7950    5/01/99   ---     10.4      8.2      6.0
      TYRELL RANGER STA.     8300    4/30/99     0       .0      7.7      7.5
 
   SHOSHONE & CLARKS FORK RIVER BASINS                        
      BEARTOOTH LK. PILLOW   9280    5/01/99   ---     27.7     20.1     26.0
      BLACKWATER PILLOW      9780    5/01/99   ---     35.2     21.9     25.7
      CARTER MOUNTAIN        7950    4/30/99    17      5.6      7.6      6.0
      FISHER CREEK PILLOW    9100    5/01/99   ---     39.6     28.3     38.7
      FISHER CREEK           9100                                ---     41.8
      EVENING STAR PILLOW    9200    5/01/99   ---     37.2     22.6     30.8
      MARQUETTE PILLOW       8760    5/01/99   ---     17.4     14.2      8.6
      PARKERS PEAK PILLOW    9400    5/01/99   ---     27.4     19.1     23.7
      N.E. ENTRANCE PILLOW   7350    5/01/99   ---      6.3       .0      5.9
      NORTHEAST ENTRANCE     7350                                ---      6.1
      PARKERS PEAK PILLOW    9400    5/01/99   ---     27.4     19.1     23.7
      SYLVAN ROAD PILLOW     7120    5/01/99   ---     11.9      5.4      7.9
      WHITE MILL PILLOW      8700    5/01/99   ---     30.1     23.1     26.3
      WHITE MILL             8700                                ---     29.9
      WOLVERINE PILLOW       7650    5/01/99   ---      8.8      2.6      8.1
      YOUNTS PEAK PILLOW     8350    5/01/99   ---     21.7     15.6     18.3
 
   POWDER & TONGUE RIVER BASINS                               
      BEAR TRAP PILLOW       8200    5/01/99   ---      1.8      3.0      4.2
      BIG GOOSE              7760    4/27/99    24      8.3      9.0      8.3
      BONE SPGS. PILLOW      9350    5/01/99   ---     20.4     20.1     18.4
      BURGESS JCT. PILLOW    7880    5/01/99   ---     11.3     12.1     13.5
      CLOUD PEAK PILLOW      9850    5/01/99   ---     23.6     17.1     17.7
      DOME LAKE PILLOW       8880    5/01/99   ---     13.2     13.8     15.0
      HANSEN S.M. PILLOW     8360    5/01/99   ---      6.4      7.5      6.9
      MIDDLE POWDER PILLOW   7760    5/01/99   ---     16.5     12.1     14.8
      MIDDLE POWDER          7760                                ---     14.0
      NORTH TONGUE           8450    4/27/99    41     12.9     13.3     13.9
      ONION GULCH            8780    4/30/99    36      9.9     11.4      8.9
      POWDER RVR.PASS PILL   9480    5/01/99   ---     13.1     11.9     10.5
      SAWMILL DIVIDE         9260    4/26/99    53     14.8     14.7     15.6
      SOLDIER PARK           8780    4/30/99     0       .0     10.7      6.9
      SOUR DOUGH             8460    4/30/99    38     10.4     12.6      6.9
      SUCKER CREEK PILLOW    8880    5/01/99   ---     14.6     12.5     13.8
      SUCKER CREEK           8880                                ---     14.1
      WOOD ROCK G.S.         8440    4/26/99    39     11.3     11.0     12.2
 
   BELLE FOURCHE & CHEYENNE RIVER BASINS                      
      BEARLODGE DIVIDE       4680    4/28/99     0       .0       .0       .8
      BLIND PARK PILLOW      6870    5/01/99   ---       .0      1.0      9.6
      DITCH CREEK            6870                                 .0      ---
      NORTH RAPID CK PILL.   6130    5/01/99   ---      1.1      3.7      ---
      MALLO                  6420                                 .0       .0
      MOUNT TOM              5560                                ---       .1
      REUTER CANYON          6280    4/28/99     0       .0      3.9      4.5
      UPPER SPEARFISH        6500                                ---      7.0
      WARREN PEAK PILLOW     6520    5/01/99   ---      6.9      7.7      9.6
      LITTLE BEAR RUN        6240                                 .0      ---
 
   UPPER NORTH PLATTE BASIN                                   
      DIVIDE PEAK PILLOW     8860    5/01/99   ---     21.2     16.5     19.3
      JOE WRIGHT SNOTEL     10000    5/01/99   ---     22.6     23.2     24.7
      MOSS LAKE              9800    4/28/99    68     25.6     22.7     26.9
      NORTH BARRETT CREEK    9400    4/28/99    74     27.0     22.5     22.6
      NORTH FRENCH PILLOW   10130    5/01/99   ---     38.4     32.6     29.4
      OLD BATTLE PILLOW      9920    5/01/99   ---     36.9     35.1     38.2
      PURGATORY GULCH        8970    4/28/99    42     15.3     10.8     10.3
      ROACH SNOTEL           9400    5/01/99   ---     19.4     14.8     18.1
      RYAN PARK              8400    4/28/99    23      8.0      5.1      7.9
      SAND LAKE PILLOW      10050    5/01/99   ---     46.1     30.6     37.2
      SOUTH BRUSH PILLOW     8440    5/01/99   ---      9.6      3.0     10.6
      WEBBER SPRING PILLOW   9250    5/01/99   ---     21.4     19.2     26.0
      WILLOW CK PS SNOTEL    9500    5/01/99   ---     15.0      9.4     13.5
 
   LOWER NORTH PLATTE, SWEETWATER & LARAMIE RIVER BASINS      
      ALBANY                 9400    4/28/99    41     14.9     12.6     12.8
      BOXELDER               7280    4/29/99    23      7.8      6.4      6.4
      BROOKLYN LK. PILLOW   10220    5/01/99   ---     27.8     24.4     28.9
      BUCK CREEK             7960    4/29/99    29     11.0      8.4     10.0
      CASPER MTN. PILLOW     7850    5/01/99   ---     13.7     10.2     17.8
      DEADMAN HILL SNOTEL   10200    5/01/99   ---     20.9     16.9     19.1
      DEADMAN HILL          10200                                ---      ---
      FOXPARK                9060    4/28/99    23      9.3      8.4      5.4
      GRANNIER MEADOWS       8860    5/01/99   ---     21.2E    13.0     15.1
      HAIRPIN TURN           9480    4/29/99    42     16.0     15.0     16.6
      JOE WRIGHT SNOTEL     10000    5/01/99   ---     22.6     23.2     24.7
      LA BONTE               8450    5/01/99     0       .0       .0      1.8
      LA PRELE PILLOW        8380    5/01/99   ---     12.5      3.3      6.3
      LARSEN CREEK           9020    4/26/99    49     14.6      9.5     11.2
      LIBBY LODGE            8750    4/29/99    27      9.6      8.9      9.0
      POLE MOUNTAIN          8700    4/28/99    25      8.2      6.2      4.1
      RENO HILL PILLOW       8500    5/01/99   ---     15.8      9.6     13.4
      ROACH SNOTEL           9400    5/01/99   ---     19.4     14.8     18.1
      SOUTH PASS PILLOW      9040    5/01/99   ---     25.0     15.9     18.1
      WINDY PEAK PILLOW      7900    5/01/99   ---      6.8      3.4      7.9
 
   LITTLE SNAKE RIVER BASIN                                   
      BATTLE MTN. PILLOW     7440    5/01/99   ---      4.3      3.3      4.8
      BUTTER HILL            7880    4/29/99    28     10.5     10.4     10.3
      DIVIDE PEAK PILLOW     8860    5/01/99   ---     21.2     16.5     19.3
      ELK RIVER SNOTEL       8600    5/01/99   ---     14.5     11.5     16.2
      HASKINS CREEK          8980    4/29/99    79     31.5     31.9     32.6
      OLD BATTLE PILLOW      9920    5/01/99   ---     36.9     35.1     38.2
      SANDSTONE PILLOW       8150    5/01/99   ---      8.2      7.0      9.8
      WHISKEY PARK PILLOW    8950    5/01/99   ---     30.6     28.7     29.6
 
   UPPER GREEN RIVER BASIN                                    
      BIG PARK               8620    4/29/99    58     22.9     18.7     20.5
      BIG SANDY PILLOW       9080    5/01/99   ---     16.4     11.9     13.9
      BLIND BULL PILLOW      8900    5/01/99   ---     32.5     24.0     22.7
      EAST RIM DIV PILLOW    7930    5/01/99   ---     15.0     12.3     14.8
      ELKHART PARK PILLOW    9400    5/01/99   ---     16.1     11.6     14.0
      GROS VENTRE PILLOW     8750    5/01/99   ---     16.8     15.3     13.9
      INDIAN CREEK PILLOW    9430    5/01/99   ---     36.9     23.2     28.9
      KELLEY R.S. PILLOW     8180    5/01/99   ---     16.9     12.7     15.0
      KENDALL R.S. PILLOW    7740    5/01/99   ---     12.6      8.6     10.6
      LOOMIS PARK PILLOW     8240    5/01/99   ---     17.6     15.2     15.1
      NEW FORK PILLOW        8340    5/01/99   ---     12.9      7.4      9.1
      POCKET CREEK           9350                                ---     13.3
      POISON MEADOWS         8500                                ---     29.9
      ROWDY CREEK            8300    4/27/99    66     25.0     19.6     20.6
      SNIDER BASIN PILLOW    8060    5/01/99   ---     20.4     11.9     13.0
      TRIPLE PEAK  PILLOW    8500    5/01/99   ---     32.0     17.6     25.0
 
   LOWER GREEN RIVER BASIN                                    
      BIG PARK               8620    4/29/99    58     22.9     18.7     20.5
      BLACK'S FORK JUNCTN    8930   04/28/99    28      8.0      9.1      7.4
      HAMS FORK PILLOW       7840    5/01/99   ---     10.6      4.4      5.7
      HENRY'S FORK          10000    4/28/99    41     11.6     20.7     13.6
      HEWINTA SNOTEL         9500    5/01/99   ---     13.1      9.1      5.3
      HICKERSON PARK SNOTE   9100    5/01/99   ---      6.1     11.6      2.9
      HOLE-IN-ROCK SNOTEL    9150    5/01/99   ---      8.9      8.4      2.3
      INDIAN CREEK PILLOW    9430    5/01/99   ---     36.9     23.2     28.9
      KELLEY R.S. PILLOW     8180    5/01/99   ---     16.9     12.7     15.0
      SPRING CRK. PILLOW     9000    5/01/99   ---     36.0     22.1     29.6
      STEEL CREEK PARK SNO  10100    5/01/99   ---     19.7     20.7     18.9
 
   UPPER BEAR RIVER BASIN                                     
      BIG PARK               8620    4/29/99    58     22.9     18.7     20.5
      BURT'S-MILLER RANCH    7900   04/28/99     0       .0       .0      2.0
      HAYDEN FORK SNOTEL     9100    5/01/99   ---     13.8     11.0      6.6
      INDIAN CREEK PILLOW    9430    5/01/99   ---     36.9     23.2     28.9
      KELLEY R.S. PILLOW     8180    5/01/99   ---     16.9     12.7     15.0
      SALT RIVER PILLOW      7600    5/01/99   ---     14.4     11.3     10.8
      STILLWATER CAMP        8550   04/28/99    19      7.9      8.6      7.5
      TRIAL LAKE SNOTEL      9960    5/01/99   ---     25.2     23.9     24.0
      TRIAL LAKE             9960   04/27/99    63     23.3     23.9     25.7
 (d) Denotes discontinued site.

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