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

                                   JANUARY 1998


      SNOW COURSE         ELEVATION    DATE    SNOW   WATER     LAST   AVERAGE
                                              DEPTH  CONTENT    YEAR   1961-90
-------------------------------------------------------------------------------
 
   SNAKE RIVER BASIN                                          
      ASTER CREEK            7750   12/29/97    35      7.9     28.2     12.8
      BASE CAMP PILLOW       7030    1/01/98   ---      5.7     17.5      7.9
      BASE CAMP        (d)   7030   12/31/97    24      5.6     19.1      8.6
      BLACK BEAR PILLOW      7950    1/01/98   ---     12.7     38.6     15.6
      BLACK BEAR             7950                                ---      ---
      BLIND BULL PILLOW      8900    1/01/98   ---      6.7     25.4     12.5
      BRYAN FLAT             6420   12/28/97    48     10.3      ---      ---
      CCC CAMP               7000    1/01/98   ---      4.0E    10.9      5.1
      COTTONWOOD CR PILLOW   7700    1/01/98   ---      5.7     16.6      8.8
      COULTER CREEK          7020                                ---      9.0
      DARBY CANYON           8250   12/31/97    30      6.8     19.2     10.0
      EAST RIM DIV PILLOW    7930    1/01/98   ---      2.8     10.8      5.7
      ELBO RANCH             7100                                ---      ---
      FOUR MILE MEADOWS      7860    1/01/98   ---      5.1E    11.7      ---
      GLADE CREEK            7040   12/30/97    30      7.5     20.2      9.7
      GRASSY LAKE PILLOW     7270    1/01/98   ---     12.0     26.8     14.3
      GREYS BOUNDARY         5720                                ---      4.4
      GROS VENTRE PILLOW     8750    1/01/98   ---      2.4     14.0      6.9
      GROVER PARK DIVIDE     7000                                ---      4.8
      HUCKLEBERRY DIVIDE     7300   12/29/97    29      6.2     16.8      9.3
      JACKPINE CREEK         7350   12/31/97    27      6.8     17.6      8.9
      LEWIS LAKE PILLOW      7850    1/01/98   ---     10.2     31.3     13.8
      LEWIS LAKE DIVIDE      7850   12/29/97    48     12.7      ---     17.5
      MORAN                  6750    1/01/98    21      4.1     11.9      5.4
      PHILLIPS BENCH PILL.   8200    1/01/98   ---      7.3     24.4     11.5
      POISON MEADOWS         8500                                ---      9.7
      SALT RIVER PILLOW      7600    1/01/98   ---      3.7     13.1      5.1
      SALT RV SUMMIT   (d)   7600                                ---      6.1
      SNAKE RIVER STATION    6920   12/30/97    27      6.3     16.2      8.8
      SNOW KING MTN          7660                                ---      6.6
      SPRING CRK. PILLOW     9000    1/01/98   ---      5.5     22.1     11.6
      TETON PASS W.S.        7740                                ---      ---
      THUMB DIVIDE           7980   12/29/97    23      4.1     17.8      8.4
      TOGWOTEE PASS PILLOW   9580    1/01/98   ---      8.9     20.1     11.1
      TURPIN MEADOWS         6900                                ---      ---
      TWO OCEAN PILLOW       9240    1/01/98   ---     11.0     26.4     12.6
      WILLOW CREEK PILLOW    8450    1/01/98   ---      6.9     24.5     12.8
 
   UPPER YELLOWSTONE & MADISON RIVER BASINS                   
      BLACK BEAR PILLOW      7950    1/01/98   ---     12.7     38.6     15.6
      BLACK BEAR             7950                                ---      ---
      CANYON PILLOW          8090    1/01/98   ---      4.5     14.4      5.3
      CANYON           (d)   8090                                ---      6.2
      FISHER CREEK PILLOW    9100    1/01/98   ---     12.9     34.2     15.6
      FISHER CREEK           9100                                ---      ---
      LAKE CAMP              7780   12/28/97    13      3.0      9.9      3.8
      LUPINE CREEK           7380   12/30/97    14      2.2      9.6      4.3
      MADISON PLT PILLOW     7750    1/01/98   ---      6.5     24.1     10.1
      MADISON PLATEAU        7750                                ---      ---
      NORRIS BASIN           7500    1/01/98    16      2.2      9.8      5.0
      N.E. ENTRANCE PILLOW   7350    1/01/98   ---      2.3      6.9      4.0
      NORTHEAST ENTRANCE     7350   12/31/97    14      2.1      7.1      3.7
      OLD FAITHFUL           7400   12/31/97    17      3.4     15.4      6.4
      PARKERS PEAK PILLOW    9400    1/01/98   ---      8.2     18.4     10.6
      SYLVAN LAKE PILLOW     8420    1/01/98   ---      7.1     17.3     10.8
      SYLVAN PASS      (d)   7100                                ---      5.9
      THUMB DIVIDE           7980   12/29/97    23      4.1     17.8      8.4
      TWENTY-ONE MILE        7150   12/31/97    21      4.2     14.0      7.3
      TWO OCEAN PILLOW       9240    1/01/98   ---     11.0     26.4     12.6
      WEST YELL'ST PILLOW    6700   12/31/97   ---      1.7      8.0      4.0
      WEST YELLOWSTONE       6700   12/31/97    14      2.6     11.4      4.8
 
   WIND RIVER BASIN                                           
      BLUE RIDGE             9620   12/31/97    16      3.8      ---      ---
      BURROUGHS CRK PILLOW   8750    1/01/98   ---      5.9     15.6      7.1
      BURROUGHS CREEK        8750                                ---      ---
      CASTLE CREEK           8400                                ---      ---
      CHRISTINA LK PILLOW    9980                               12.5      7.5
      COLD SPRINGS PILLOW    9630    1/01/98   ---      4.8      6.4      4.4
      DINWOODY         (d)  10160                                ---      ---
      DU NOIR                8760                                ---      ---
      GEYSER CREEK           8500                                ---      ---
      GRANNIER MEADOWS       8860                                ---      ---
      HOBBS PARK PILLOW     10100    1/01/98   ---      6.3     10.7      7.7
      LITTLE WARM PILLOW     9370    1/01/98   ---      3.8     11.2      5.1
      MIDDLE FORK            7420                                ---      ---
      SOUTH PASS PILLOW      9040    1/01/98   ---      5.7     16.9      8.3
      SOUTH PASS       (d)   9040                                ---      ---
      ST LAWRENCE ALT PILL   8620    1/01/98   ---      5.3      4.9      3.3
      T CROSS RANCH          7900                                ---      ---
      TOGWOTEE PASS PILLOW   9580    1/01/98   ---      8.9     20.1     11.1
      TOWNSEND CRK PILLOW    8700    1/01/98   ---      5.4      6.2      4.5
      TOWNSEND CREEK   (d)   8700                                ---      ---
      YOUNTS PEAK PILLOW     8350    1/01/98   ---      6.6     15.0      8.9
 
   BIG HORN RIVER BASIN                                       
      BALD MOUNTAIN PILLOW   9380    1/01/98   ---      9.2     10.8     10.2
      BALD MOUNTAIN    (d)   9380                                ---      ---
      BONE SPGS. PILLOW      9350    1/01/98   ---      7.9      9.9      7.8
      BONE SPRINGS DIVIDE    9350                                ---      ---
      GENEVA PASS       AM   9400                                ---      ---
      IRISH ROCK PILLOW      9600                                ---      6.0
      KIRWIN PILLOW          9550    1/01/98   ---      5.8      9.8      5.2
      LOST CREEK PILLOW      8080                                7.6      5.8
      MEDICINE LODGE LAKES   9340                                ---      ---
      MIDDLE POWDER PILLOW   7760    1/01/98   ---      3.7      7.6      5.7
      MIDDLE POWDER          7760                                ---      ---
      NOWOOD CREEK PILLOW    8600                                ---      5.6
      ONION GULCH            8780                                ---      ---
      OWL CREEK PILLOW       8980    1/01/98   ---      3.2      4.7      1.9
      OWL CREEK              8980                                ---      ---
      POWDER RVR.PASS PILL   9480    1/01/98   ---      4.3      6.3      5.1
      RANGER CREEK           8120                                ---      ---
      SHELL CREEK PILLOW     9580    1/01/98   ---      6.8      9.5      7.5
      SHELL CREEK            9580                                ---      ---
      TIMBER CREEK PILLOW    7950    1/01/98   ---      4.6      3.7      2.4
      TIMBER CREEK           7950                                ---      ---
      TYRELL RANGER STA.     8300                                ---      ---
 
   SHOSHONE & CLARKS FORK RIVER BASINS                        
      BEARTOOTH LK. PILLOW   9280    1/01/98   ---      9.5     21.7     11.5
      BLACKWATER PILLOW      9780    1/01/98   ---      9.8     22.8      9.9
      CARTER MOUNTAIN        7950                                5.0      ---
      FISHER CREEK PILLOW    9100    1/01/98   ---     12.9     34.2     15.6
      FISHER CREEK           9100                                ---      ---
      EVENING STAR PILLOW    9200    1/01/98   ---     10.1     25.4     12.9
      MARQUETTE PILLOW       8760    1/01/98   ---      6.9      6.6      3.8
      MARQUETTE CREEK        8760                                ---      ---
      PARKERS PEAK PILLOW    9400    1/01/98   ---      8.2     18.4     10.6
      N.E. ENTRANCE PILLOW   7350    1/01/98   ---      2.3      6.9      4.0
      NORTHEAST ENTRANCE     7350   12/31/97    14      2.1      7.1      3.7
      PARKERS PEAK PILLOW    9400    1/01/98   ---      8.2     18.4     10.6
      SYLVAN PASS      (d)   7100                                ---      5.9
      SYLVAN ROAD PILLOW     7120    1/01/98   ---      3.7     11.5      5.8
      WHITE MILL PILLOW      8700    1/01/98   ---     10.4     23.3     11.4
      WHITE MILL             8700                                ---      ---
      WOLVERINE PILLOW       7650    1/01/98   ---      3.9      9.9      5.2
      WOLVERINE        (d)   7650                                ---      ---
      YOUNTS PEAK PILLOW     8350    1/01/98   ---      6.6     15.0      8.9
 
   POWDER & TONGUE RIVER BASINS                               
      BEAR TRAP PILLOW       8200    1/01/98   ---      2.5      4.2      3.7
      BEAR TRAP MDWS AM(d)   8200                                ---      ---
      BIG GOOSE              7760                                ---      ---
      BONE SPGS. PILLOW      9350    1/01/98   ---      7.9      9.9      7.8
      BONE SPRINGS DIVIDE    9350                                ---      ---
      BURGESS JCT. PILLOW    7880    1/01/98   ---      4.9      6.9      5.5
      BURGESS R.S.     (d)   7880                                ---      ---
      CLOUD PEAK PILLOW      9850    1/01/98   ---      5.7      9.7      5.6
      CLOUD  PEAK       AM   9850                                ---      ---
      DOME LAKE PILLOW       8880    1/01/98   ---      5.2      6.9      6.3
      DOME LAKE              8880                                ---      ---
      GENEVA PASS       AM   9400                                ---      ---
      HANSEN S.M. PILLOW     8360    1/01/98   ---      3.1      4.1      3.3
      LOST CREEK PILLOW      8080                                7.6      5.8
      MIDDLE POWDER PILLOW   7760    1/01/98   ---      3.7      7.6      5.7
      MIDDLE POWDER          7760                                ---      ---
      NORTH TONGUE           8450                                ---      ---
      ONION GULCH            8780                                ---      ---
      POWDER RVR.PASS PILL   9480    1/01/98   ---      4.3      6.3      5.1
      POWDER RV PASS   (d)   9480                                ---      ---
      SAWMILL DIVIDE         9260                                ---      ---
      SOLDIER PARK           8780                                ---      ---
      SOUR DOUGH             8460                                ---      ---
      SUCKER CREEK PILLOW    8880    1/01/98   ---      5.8      7.7      5.2
      SUCKER CREEK           8880                                ---      ---
      WOOD ROCK G.S.         8440                                ---      ---
 
   BELLE FOURCHE & CHEYENNE RIVER BASINS                      
      BEARLODGE DIVIDE       4680                                ---      ---
      BLIND PARK PILLOW      6870    1/01/98   ---      4.5      6.5      5.3
      DITCH CREEK            6870   12/31/97    10      1.2      3.3    999.9
      NORTH RAPID CK PILL.   6130    1/01/98   ---      4.6      7.3    999.9
      MALLO PILLOW           6420                                ---      3.1
      MALLO                  6420   12/29/97    20      2.5      6.2      3.3
      MOUNT TOM              5560   12/29/97    13      1.5      5.9      2.2
      MOUNT TOM PILLOW       5560                                ---      1.5
      REUTER CANYON          6280                                ---      ---
      UPPER SPEARFISH        6500                                ---    999.9
      WARREN PEAK PILLOW     6520    1/01/98   ---      4.5     10.2      5.3
      WARREN PEAK            6520                                ---      ---
      LITTLE BEAR RUN        6240   12/31/97    17      1.8      2.4    999.9
 
   UPPER NORTH PLATTE BASIN                                   
      DIVIDE PEAK PILLOW     8860    1/01/98   ---      5.7     13.9      9.5
      JOE WRIGHT SNOTEL     10000    1/01/98   ---      8.7     12.2     10.4
      MOSS LAKE              9800                                ---      ---
      NORTH BARRETT CREEK    9400                                ---      ---
      NORTH FRENCH PILLOW   10130    1/01/98   ---     10.1     18.0     11.4
      OLD BATTLE PILLOW      9920    1/01/98   ---      9.0     24.2     14.8
      PURGATORY GULCH        8970                                ---      ---
      ROACH SNOTEL           9400    1/01/98   ---      5.8     13.6      7.7
      RYAN PARK              8400                                ---      ---
      SAND LAKE PILLOW      10050    1/01/98   ---     10.4     20.5     15.1
      SOUTH BRUSH PILLOW     8440    1/01/98   ---      3.1      8.5      4.8
      WEBBER SPRING PILLOW   9250    1/01/98   ---      6.2     18.9     12.2
      WILLOW CK PS SNOTEL    9500    1/01/98   ---      3.2     10.5      5.7
 
   LOWER NORTH PLATTE, SWEETWATER & LARAMIE RIVER BASINS      
      ALBANY                 9400                                ---      ---
      BOXELDER               7280                                ---      ---
      BROOKLYN LK. PILLOW   10220    1/01/98   ---      6.5     19.3     12.0
      BUCK CREEK             7960                                ---      ---
      CASPER MTN. PILLOW     7850    1/01/98   ---      6.7     11.6      7.5
      CHRISTINA LK PILLOW    9980                               12.5      7.5
      DEADMAN HILL SNOTEL   10200    1/01/98   ---      7.6      8.6      7.9
      DEADMAN HILL          10200                                ---      ---
      FOXPARK                9060                                ---      ---
      GRANNIER MEADOWS       8860                                ---      ---
      HAIRPIN TURN           9480                                ---      ---
      JOE WRIGHT SNOTEL     10000    1/01/98   ---      8.7     12.2     10.4
      LA BONTE               8450                                ---      ---
      LA PRELE PILLOW        8380    1/01/98   ---      3.7      8.8      4.7
      LARSEN CREEK           9020                                ---      ---
      LIBBY LODGE            8750                                ---      ---
      POLE MOUNTAIN          8700                                ---      ---
      RENO HILL PILLOW       8500    1/01/98   ---      6.5     12.6      6.2
      ROACH SNOTEL           9400    1/01/98   ---      5.8     13.6      7.7
      SOUTH PASS PILLOW      9040    1/01/98   ---      5.7     16.9      8.3
      SOUTH PASS       (d)   9040                                ---      ---
      WINDY PEAK PILLOW      7900    1/01/98   ---      2.9      5.9      3.3
 
   LITTLE SNAKE RIVER BASIN                                   
      BATTLE MTN. PILLOW     7440    1/01/98   ---      2.2      7.4      5.0
      BUTTER HILL            7880                                ---      ---
      DIVIDE PEAK PILLOW     8860    1/01/98   ---      5.7     13.9      9.5
      ELK RIVER SNOTEL       8600    1/01/98   ---      4.3     14.1      8.1
      HASKINS CREEK          8980                                ---      ---
      OLD BATTLE PILLOW      9920    1/01/98   ---      9.0     24.2     14.8
      SANDSTONE PILLOW       8150    1/01/98   ---      3.5     10.2      6.2
      WHISKEY PARK PILLOW    8950    1/01/98   ---      6.4     19.4     12.8
 
   UPPER GREEN RIVER BASIN                                    
      BIG PARK               8620                                ---      ---
      BIG SANDY PILLOW       9080    1/01/98   ---      3.8     12.1      6.0
      BLIND BULL PILLOW      8900    1/01/98   ---      6.7     25.4     12.5
      EAST RIM DIV PILLOW    7930    1/01/98   ---      2.8     10.8      5.7
      ELKHART PARK PILLOW    9400    1/01/98   ---      3.8     12.4      5.8
      GROS VENTRE PILLOW     8750    1/01/98   ---      2.4     14.0      6.9
      INDIAN CREEK PILLOW    9430    1/01/98   ---      6.3     22.8     11.6
      KELLEY R.S. PILLOW     8180    1/01/98   ---      3.9     15.6      6.7
      KENDALL R.S. PILLOW    7740    1/01/98   ---      3.7     16.9      5.9
      LOOMIS PARK PILLOW     8240    1/01/98   ---      3.7     19.7      7.0
      NEW FORK PILLOW        8340    1/01/98   ---      2.9     10.5      4.6
      POCKET CREEK           9350                                ---      ---
      POISON MEADOWS         8500                                ---      9.7
      ROWDY CREEK            8300                                ---      ---
      SNIDER BASIN PILLOW    8060    1/01/98   ---      2.9     14.0      6.0
      TRIPLE PEAK  PILLOW    8500    1/01/98   ---      6.0     22.2     10.9
      TRIPLE PEAK            8500                                ---      9.6
 
   LOWER GREEN RIVER BASIN                                    
      BIG PARK               8620                                ---      ---
      BLACK'S FORK JUNCTN    8930                                ---      ---
      HAMS FORK PILLOW       7840    1/01/98   ---      2.9     10.6      4.3
      HENRY'S FORK          10000                                ---      ---
      HEWINTA SNOTEL         9500    1/01/98   ---      4.3S     6.4      3.9
      HICKERSON PARK SNOTE   9100    1/01/98   ---      5.6S     3.5      2.6
      HOLE-IN-ROCK SNOTEL    9150    1/01/98   ---      3.8S     4.1      2.3
      INDIAN CREEK PILLOW    9430    1/01/98   ---      6.3     22.8     11.6
      KELLEY R.S. PILLOW     8180    1/01/98   ---      3.9     15.6      6.7
      SPRING CRK. PILLOW     9000    1/01/98   ---      5.5     22.1     11.6
      STEEL CREEK PARK SNO  10100    1/01/98   ---      6.1S     8.4      7.2
 
   UPPER BEAR RIVER BASIN                                     
      BIG PARK               8620                                ---      ---
      BURT'S-MILLER RANCH    7900                                ---      ---
      HAYDEN FORK SNOTEL     9100    1/01/98   ---      4.0S    10.8      6.8
      HAYDEN FORK            9100                                ---      ---
      INDIAN CREEK PILLOW    9430    1/01/98   ---      6.3     22.8     11.6
      KELLEY R.S. PILLOW     8180    1/01/98   ---      3.9     15.6      6.7
      MONTE CRISTO R.S.      8960                                ---      ---
      SALT RIVER PILLOW      7600    1/01/98   ---      3.7     13.1      5.1
      SALT RV SUMMIT   (d)   7600                                ---      6.1
      STILLWATER CAMP        8550                                ---      ---
      TRIAL LAKE SNOTEL      9960    1/01/98   ---      5.0S    20.4     10.8
      TRIAL LAKE             9960                                ---      ---
 (d) Denotes discontinued site.

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