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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 JUL 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  761.91     7473
 1   761.90  761.88     7447      0       27   0.050      20   0.03  0.05
 2   762.39  764.81    10545      0      509   0.200    2075   1.57  1.53
 3   764.46  763.77     9344      0      745   0.280     150   0.63  0.49
 4   763.50  763.05     8569      0      396   0.360      50   0.00  0.00
 5   762.90  762.62     8149      0      216   0.240      10   0.00  0.00

 6   762.54  762.59     8120      0      148   0.230     100   0.02  0.16
 7   762.56  762.54     8072      0      150   0.240     140   0.07  0.08
 8   762.48  762.33     7870      0      123   0.280      30   0.14  0.10
 9   762.27  762.65     8178      0      103   0.310     250   0.00  0.00
10   762.94  762.79     8313      0      219   0.070     200   0.28  0.38

11   762.69  762.50     8034      0      169   0.310     100   0.00  0.00
12   762.42  762.27     7812      0      111   0.360      50   0.00  0.00
13   762.22  762.12     7668      0       75   0.350      30   0.00  0.01
14   762.08  762.01     7562      0       51   0.370      10   0.00  0.00
15   761.99  761.93     7491      0       37   0.320       8   0.00  0.00

16   761.91  761.87     7438      0       28   0.350       5   0.00  0.00
17   761.85  761.81     7385      0       21   0.160       4   0.00  0.00
18   761.79  761.76     7342      0       16   0.340       3   0.00  0.00
19   761.76  761.73     7315      0       13   0.280       2   0.00  0.00
20   761.73  761.70     7289      0       10   0.320       1   0.00  0.00

21   761.69  761.67     7263      0        8   0.350       1   0.00  0.00
22   761.67  761.64     7236      0        6   0.330       1   0.00  0.00
23   761.64  762.18     7725      0       16   0.280     250   0.00  0.00
24   762.35  762.33     7870      0       99   0.220     150   0.61  0.98
25   762.27  762.17     7716      0       84   0.090      50   0.03  0.02

26   762.13  762.03     7581      0       58   0.100      20   0.00  0.00
27   762.00  761.94     7499      0       39   0.270       5   0.00  0.00
28   761.91  761.92     7482      0       30   0.310       5   0.00  0.00
29   761.94  762.00     7552      0       34   0.040      70   0.90  0.84
30   762.03  762.01     7562      0       44   0.030      50   0.02  0.04
31   762.00  761.94     7499      0       38   0.120      20   0.00  0.00

TOTAL                             0     3625   7.560    3860   4.30  4.68
AVERAGE   762.28                  0      117             125 NORMAL= 3.01

MAXIMUM   764.81       10545   DATE= 2    TOP CONSERVATION POOL    761.50
MINIMUM   761.64        7236   DATE=23    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     7656 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION