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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 SEP 07


    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  761.64     7236
 1   761.63  761.61     7210      0        4   0.310       0   0.00  0.00
 2   761.60  761.58     7184      0        3   0.280       0   0.00  0.00
 3   761.58  761.56     7166      0        2   0.270       0   0.00  0.00
 4   761.56  761.58     7184      0        2   0.220      10   0.00  0.00
 5   761.58  761.62     7219      0        3   0.040      20   0.22  0.20

 6   761.65  761.67     7263      0        6   0.050      30   0.28  0.32
 7   761.67  761.67     7263      0        7   0.220      50   0.00  0.00
 8   761.77  762.93     8448      0       88   0.070     650   0.46  1.12
 9   762.92  762.70     8226      0      219   0.050     100   0.85  1.13
10   762.59  762.45     7985      0      152   0.170      30   0.00  0.00

11   762.37  762.24     7783      0      102   0.100       5   0.15  0.29
12   762.18  762.09     7639      0       67   0.220       0   0.00  0.00
13   762.04  761.97     7526      0       45   0.220       0   0.00  0.00
14   761.94  761.88     7447      0       31   0.180       0   0.00  0.00
15   761.86  761.82     7394      0       22   0.130       0   0.00  0.00

16   761.80  761.77     7350      0       17   0.120       0   0.00  0.00
17   761.76  761.73     7315      0       13   0.250       0   0.00  0.00
18   761.72  761.70     7289      0       10   0.270       0   0.00  0.00
19   761.69  761.68     7271      0        8   0.180       5   0.00  0.00
20   761.70  761.70     7289      0        9   0.140      25   0.01  0.02

21   761.70  761.68     7271      0        8   0.200       5   0.00  0.00
22   761.67  761.66     7254      0        7   0.220       5   0.00  0.00
23   761.65  761.65     7245      0        6   0.210       5   0.00  0.00
24   761.64  761.63     7228      0        5   0.130       0   0.05  0.06
25   761.62  761.66     7254      0        5   0.220      20   0.00  0.00

26   761.73  761.81     7385      0       13   0.020      80   0.89  0.96
27   761.81  761.80     7377      0       18   0.000      20   0.00  0.16
28   761.79  761.76     7342      0       15   0.180       2   0.00  0.00
29   761.75  761.71     7298      0       12   0.190       0   0.00  0.00
30   761.70  761.69     7280      0        9   0.240       0   0.00  0.00

TOTAL                             0      908   5.100    1062   2.91  4.26
AVERAGE   761.83                  0       30              35 NORMAL= 3.98

MAXIMUM   762.93        8448   DATE= 8    TOP CONSERVATION POOL    761.50
MINIMUM   761.56        7166   DATE= 4    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     2106 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION