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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 05


    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  761.61     7210
 1   761.61  761.61     7210      0        4   0.250       5   0.00  0.00
 2   761.61  761.61     7210      0        4   0.090       5   0.00  0.00
 3   761.61  761.61     7210      0        4   0.110       5   0.00  0.00
 4   761.61  761.61     7210      0        4   0.140       5   0.00  0.00
 5   761.61  761.61     7210      0        4   0.090       5   0.00  0.00

 6   761.61  761.61     7210      0        4   0.090       5   0.00  0.00
 7   761.61  761.61     7210      0        4   0.280       5   0.00  0.00
 8   761.61  761.61     7210      0        4   0.170       5   0.00  0.00
 9   761.61  761.60     7201      0        3   0.120       5   0.00  0.01
10   761.60  761.59     7192      0        3   0.230       5   0.00  0.00

11   761.60  761.59     7192      0        3   0.300       5   0.00  0.00
12   761.59  761.58     7184      0        2   0.370      15   0.00  0.00
13   761.60  761.71     7298      0        4   0.180      65   0.13  0.18
14   761.80  761.84     7412      0       18   0.140      50   0.92  0.90
15   761.83  761.80     7377      0       19   0.340      35   0.00  0.00

16   761.80  761.77     7350      0       16   0.230      20   0.00  0.00
17   761.75  761.73     7315      0       13   0.300      15   0.00  0.00
18   761.72  761.71     7298      0       10   0.350      10   0.00  0.00
19   761.77  761.89     7456      0       19   0.270      80   0.76  0.80
20   761.89  761.86     7429      0       26   0.190      25   0.41  0.33

21   761.84  761.81     7385      0       21   0.320      10   0.00  0.00
22   761.80  761.77     7350      0       17   0.340       7   0.00  0.00
23   761.75  761.74     7324      0       13   0.350       5   0.00  0.00
24   761.72  761.71     7298      0       11   0.240       3   0.02  0.01
25   761.70  761.66     7254      0        8   0.170       2   0.02  0.02

26   761.65  761.62     7219      0        5   0.220       1   0.00  0.00
27   761.62  761.61     7210      0        4   0.200       1   0.00  0.01
28   761.60  761.59     7192      0        3   0.110       1   0.01  0.01
29   761.59  761.57     7175      0        2   0.210       1   0.00  0.00
30   761.57  761.56     7166      0        2   0.230       1   0.00  0.00
31   761.56  761.56     7166      0        1   0.190       1   0.00  0.00

TOTAL                             0      251   6.820     403   2.27  2.27
AVERAGE   761.67                  0        8              13 NORMAL= 5.04

MAXIMUM   761.89        7456   DATE=20    TOP CONSERVATION POOL    761.50
MINIMUM   761.55        7157   DATE=31    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=      799 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION