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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 06


    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  762.12     7668
 1   762.09  762.02     7571      0       52   0.240      30   0.00  0.00
 2   761.99  761.92     7482      0       37   0.240      10   0.00  0.00
 3   761.91  761.85     7420      0       27   0.230       5   0.00  0.00
 4   762.99  763.27     8806      0      287   0.260     900   0.92  0.95
 5   763.09  762.78     8303      0      273   0.050      25   0.02  0.02

 6   762.66  762.46     7995      0      162   0.140      10   0.00  0.01
 7   762.38  762.24     7783      0      104   0.010       5   0.13  0.12
 8   762.19  762.11     7658      0       70   0.070      10   0.01  0.02
 9   762.07  762.01     7562      0       49   0.210      50   0.02  0.03
10   762.20  762.25     7793      0       77   0.180     100   0.50  0.48

11   762.22  762.13     7677      0       75   0.160      50   0.06  0.05
12   762.10  762.00     7552      0       53   0.290      20   0.00  0.00
13   761.97  761.91     7473      0       35   0.290      10   0.00  0.00
14   761.89  761.85     7420      0       26   0.300       5   0.00  0.00
15   761.84  761.77     7350      0       19   0.340       4   0.00  0.00

16   761.76  761.72     7306      0       13   0.230       3   0.00  0.00
17   761.71  761.69     7280      0       10   0.280       2   0.00  0.00
18   761.67  761.66     7254      0        7   0.340       2   0.00  0.00
19   761.65  761.63     7228      0        6   0.310       2   0.00  0.00
20   761.63  761.61     7210      0        4   0.360       2   0.00  0.00

21   761.60  761.59     7192      0        3   0.360       2   0.01  0.01
22   761.58  761.57     7175      0        2   0.270       1   0.00  0.00
23   761.56  761.54     7149      0        1   0.300       0   0.00  0.00
24   761.53  761.52     7131      0        1   0.340       0   0.00  0.00
25   761.52  761.50     7114      0        0   0.300       0   0.00  0.00

26   761.49  761.47     7087      0        0   0.390       0   0.00  0.04
27   761.47  761.45     7070      0        0   0.340       0   0.00  0.00
28   761.43  761.42     7043      0        0   0.390       0   0.00  0.00
29   761.41  761.37     6999      0        0   0.340       0   0.00  0.00
30   761.37  761.34     6973      0        0   0.360       0   0.00  0.00
31   761.34  761.32     6956      0        0   0.300       0   0.00  0.00

TOTAL                             0     1392   8.220    1248   1.67  1.73
AVERAGE   761.84                  0       45              40 NORMAL= 5.04

MAXIMUM   763.37        8913   DATE= 4    TOP CONSERVATION POOL    761.50
MINIMUM   761.32        6956   DATE=31    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     2475 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION