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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 DEC 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  761.54     5541
 1   761.54  761.55     5551      0        1   0.030       4   0.03  0.02
 2   761.56  761.55     5551      0        1   0.040       3   0.00  0.01
 3   761.55  761.55     5551      0        1   0.090       3   0.01  0.01
 4   761.55  761.55     5551      0        1   0.090       3   0.00  0.00
 5   761.55  761.54     5541      0        1   0.100       3   0.00  0.00

 6   761.54  761.54     5541      0        1   0.110       2   0.00  0.00
 7   761.54  761.55     5551      0        1   0.030       2   0.00  0.00
 8   761.55  761.56     5561      0        1   0.000      10   0.00  0.00
 9   761.64  761.94     5947      0       13   0.000     210   0.11  0.48
10   762.09  762.80     6692      0       95   0.000     470   0.00  0.63

11   763.07  764.67     8598      0      459   0.000    1400   0.00  0.03
12   764.95  764.42     8319      0      948   0.000     800   0.21  0.93
13   764.07  763.51     7366      0      603   0.000     150   0.00  0.00
14   763.30  762.95     6820      0      334   0.000      50   0.00  0.00
15   762.87  762.87     6752      0      227   0.000     200   0.03  0.10

16   762.82  762.66     6572      0      201   0.010     110   0.00  0.08
17   762.59  762.44     6384      0      149   0.050      60   0.00  0.00
18   762.38  762.28     6247      0      106   0.120      40   0.00  0.00
19   762.24  762.16     6145      0       78   0.060      30   0.00  0.00
20   762.13  762.07     6068      0       60   0.080      20   0.00  0.00

21   762.05  762.00     6008      0       46   0.060      20   0.00  0.00
22   762.00  761.97     5978      0       41   0.090      20   0.00  0.00
23   761.96  761.94     5947      0       34   0.020      20   0.01  0.09
24   761.93  761.91     5917      0       31   0.060      20   0.00  0.00
25   761.90  761.88     5886      0       27   0.060      20   0.00  0.00

26   761.88  761.87     5876      0       25   0.090      15   0.00  0.00
27   761.86  761.85     5856      0       23   0.020      15   0.00  0.05
28   761.87  761.85     5856      0       23   0.000      25   0.14  0.15
29   761.85  761.85     5856      0       22   0.050      20   0.00  0.00
30   761.85  761.84     5846      0       22   0.050      20   0.00  0.00
31   761.85  761.82     5825      0       21   0.070      13   0.00  0.00

TOTAL                             0     3596   1.380    3778   0.54  2.58
AVERAGE   762.19                  0      116             122 NORMAL= 1.62

MAXIMUM   764.95        8911   DATE=12    TOP CONSERVATION POOL    761.50
MINIMUM   761.53        5531   DATE= 6    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     7494 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION