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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 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  762.05     7600
 1   762.28  762.59     8120      0      114   0.150     380   0.51  0.50
 2   762.57  762.46     7995      0      147   0.130      90   0.05  0.04
 3   762.41  762.29     7831      0      109   0.290      35   0.00  0.00
 4   762.24  762.17     7716      0       80   0.250      30   0.00  0.00
 5   762.15  762.08     7629      0       61   0.330      25   0.00  0.00

 6   762.03  761.99     7543      0       45   0.340      20   0.00  0.00
 7   761.96  761.94     7499      0       35   0.320      15   0.00  0.00
 8   761.92  761.89     7456      0       30   0.250      15   0.00  0.00
 9   761.88  761.85     7420      0       24   0.280      10   0.00  0.00
10   761.85  761.83     7403      0       21   0.250      10   0.00  0.00

11   761.82  761.78     7359      0       18   0.220      10   0.00  0.00
12   761.77  761.76     7342      0       15   0.220      10   0.02  0.02
13   761.76  761.90     7464      0       16   0.080      80   0.00  0.00
14   761.98  761.99     7543      0       38   0.060      70   0.44  0.50
15   761.97  761.94     7499      0       36   0.070      30   0.00  0.00

16   761.94  761.91     7473      0       31   0.120      20   0.00  0.00
17   761.88  761.86     7429      0       25   0.250      15   0.00  0.00
18   761.85  761.82     7394      0       21   0.240      12   0.00  0.00
19   761.82  761.79     7368      0       18   0.200      10   0.00  0.00
20   761.79  761.77     7350      0       16   0.330       8   0.00  0.00

21   761.76  761.75     7333      0       13   0.370       6   0.00  0.00
22   761.73  761.69     7280      0       10   0.330       5   0.00  0.00
23   761.69  761.69     7280      0        8   0.240      10   0.00  0.00
24   761.93  762.19     7735      0       49   0.310     150   0.34  0.34
25   762.17  762.12     7668      0       67   0.310     100   0.00  0.00

26   762.09  762.00     7552      0       50   0.070      50   0.00  0.00
27   761.98  761.94     7499      0       37   0.120      30   0.00  0.00
28   761.93  761.89     7456      0       30   0.130      20   0.00  0.00
29   761.88  761.82     7394      0       24   0.320      10   0.00  0.00
30   762.78  762.88     8399      0      197   0.170     600   0.73  0.62
31   762.75  762.51     8043      0      182   0.320     100   0.00  0.00

TOTAL                             0     1568   7.070    1976   2.09  2.02
AVERAGE   762.00                  0       51              64 NORMAL= 5.04

MAXIMUM   762.98        8496   DATE=30    TOP CONSERVATION POOL    761.50
MINIMUM   761.68        7271   DATE=23    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     3919 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION