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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 APR 04


    POOL ELEVATIONS  STORAGE     RELEASES       EVAP  INFLOW   RAINFALL
DAY      FT-NGVD     2400HR         DSF        INCHES   ADJ     INCHES
      0800    2400    AC-FT   POWER    TOTAL  8A TO 8A  DSF    7A TO  7A
                                                               DAM   BSN
PRIOR MONTH  762.39     7928
 1   762.32  762.23     7773      0       95   0.190      30   0.00  0.00
 2   762.19  762.13     7677      0       71   0.230      20   0.00  0.00
 3   762.11  762.03     7581      0       55   0.260      20   0.00  0.00
 4   762.02  761.97     7526      0       42   0.270      20   0.00  0.00
 5   761.95  761.93     7491      0       34   0.240      20   0.00  0.00

 6   761.91  761.90     7464      0       29   0.120      20   0.00  0.00
 7   761.90  761.88     7447      0       27   0.130      20   0.00  0.00
 8   761.88  761.87     7438      0       25   0.110      20   0.00  0.01
 9   761.85  761.87     7438      0       23   0.270      30   0.00  0.00
10   761.92  762.18     7725      0       42   0.050     200   0.64  0.64

11   762.22  762.21     7754      0       77   0.040     100   0.22  0.18
12   762.18  762.15     7696      0       70   0.220      50   0.00  0.00
13   762.11  762.08     7629      0       59   0.210      30   0.00  0.00
14   762.03  761.99     7543      0       45   0.140      20   0.00  0.00
15   761.97  761.94     7499      0       36   0.290      15   0.00  0.00

16   761.94  761.91     7473      0       31   0.330      15   0.00  0.00
17   761.91  761.88     7447      0       28   0.330      15   0.00  0.00
18   761.88  761.86     7429      0       24   0.240      15   0.00  0.00
19   761.85  761.85     7420      0       22   0.130      15   0.00  0.00
20   761.84  761.85     7420      0       21   0.090      30   0.01  0.01

21   761.85  762.24     7783      0       33   0.130     200   0.17  0.15
22   763.53  763.83     9408      0      463   0.170    1000   1.12  1.09
23   763.62  763.24     8773      0      443   0.150     400   0.00  0.01
24   763.11  762.90     8419      0      286   0.020     140   0.14  0.13
25   762.81  762.62     8149      0      198   0.060      70   0.01  0.01

26   762.53  762.41     7947      0      140   0.250      40   0.00  0.00
27   762.33  762.23     7773      0       96   0.270      20   0.00  0.00
28   762.18  762.12     7668      0       70   0.320      25   0.00  0.00
29   762.12  762.05     7600      0       56   0.300      25   0.24  0.18
30   762.03  762.05     7600      0       46   0.130      50   0.01  0.01

TOTAL                             0     2688   5.690    2675   2.56  2.42
AVERAGE   762.18                  0       90              89 NORMAL= 3.46

MAXIMUM   763.96        9548   DATE=22    TOP CONSERVATION POOL    761.50
MINIMUM   761.83        7403   DATE=20    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     5306 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION