G R E A T    P L A I N S    R E G I O N A L    O F F I C E                              
 
       Daily Reservoir Report for: 2026APR18                                                                                        
                                                                        TOTAL   DAILY   DAILY   FEET   SPACE  PERCENT  HISTORIC   
                                                            ELEVATION  STORAGE  INFLOW  OUTFLO   TO   TO FILL   FULL  DAILY AVE   
 SITE            RESERVOIR NAME                              (feet)    (ac-ft)  (cfs)   (cfs)   FILL  (ac-ft)    (%)     (%)      
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   Big Horn River Basin
 BLR      BULL LAKE RESERVOIR ON BULL LAKE CREEK, WYOMING    5765.62     48093     113      29   39.38  104366    31      65        
 PBR      PILOT BUTTE OFFSTREAM, 22 MILES NW OF RIVERTON, WY 5454.97     29326      57     112    5.03    4395    86     102        
 BOYR     BOYSEN RESERVOIR, THERMOPOLIS, WYOMING             4712.96    534966     768     917   12.04  206628    72     100        
 ANCR     ANCHOR RESERVOIR, SOUTH FORK OWL CREEK, WYOMING    6371.19       995       1       7   69.81   16233     5     179        
 BBR      BUFFALO BILL RESERVOIR ON SHOSHONE RIVER, WYOMING  5368.77    459166     539    1077   24.73  187399    71     109        
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MONTANA AREA OFFICE
 
   Big Horn River
 BHR      BIGHORN LAKE, MONTANA                              3614.07    778736    1903    1572   25.93  241837    76     101        
 BHSX     BIGHORN RIVER BELOW BIA CANAL, MT                  3187.12                      1583                           103        
 
   Upper Missouri River Basin
 LIMR     LIMA RES UPSTREAM OF CLARK CANYON RES, MONTANA     6578.11     58921     139       2    9.89   26104    69     128        
 CCR      CLARK CANYON RESERVOIR, BEAVERHEAD RVR NR DILLON,  5531.90    109178      76      35   14.20   65189    62      86        
 HEBR     HEBGEN LAKE NEAR WEST YELLOWSTONE, MONTANA         6530.22    328263     783     665    4.65   57918    85     111        
 CFR      CANYON FERRY LAKE NEAR HELENA, MONTANA             3786.22   1532997    3944    3161   10.78  358891    81     106        
 
   Sun River Basin
 GIBR     GIBSON RESERVOIR, MONTANA                          4708.77     79291    1065    1022   15.23   19396    80     215        
 PSHR     PISHKUN RESERVOIR NEAR AUGUSTA, MONTANA            4355.49     27626       0       0   14.51   19068    59      89        
 WCR      WILLOW CREEK RESERVOIR, 6 MILES NW AUGUSTA, MONTAN 4129.39     16102      88       0   12.61   15746    50      64        
 
   Marias River Basin
 SWTR     SWIFT RESERVOIR, BIRCH CREEK, MONTANA              ******  NO DATA Within Lookback Period to 2025SEP30 ******             
 LER      LAKE ELWELL SPILLWAY TRANSDUCER, MONTANA           2987.53    824622     998     503    5.47  101027    89     112        
 
   Milk River Basin
 SHER     LAKE SHERBURNE, SWIFT CURRENT CREEK NEAR BABB, MT  4783.49     58584     191     596    4.51    7563    88     197        
 FRR      FRESNO RESERVOIR NEAR HAVRE, MONTANA               2558.50     34734     366      41   16.50   57012    37      60        
 NELR     NELSON RESERVOIR AT DAM 10 MILES NW OF SACO, MT    2216.22     57614       0       0    5.38   21336    72      92