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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 09


    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  764.96     8922
 1   764.64  764.30     8185      0      877   0.030     500   0.07  0.06
 2   764.03  763.80     7653      0      619   0.010     350   0.30  0.18
 3   763.70  763.41     7268      0      475   0.030     300   0.20  0.27
 4   763.26  763.09     6952      0      337   0.040     170   0.05  0.03
 5   763.18  763.32     7179      0      332   0.040     450   0.33  0.30

 6   763.47  763.35     7208      0      404   0.000     420   0.34  0.30
 7   763.22  762.96     6829      0      317   0.140     130   0.00  0.00
 8   762.87  762.67     6581      0      211   0.170      90   0.00  0.00
 9   762.59  762.45     6393      0      151   0.130      60   0.03  0.01
10   762.39  762.29     6256      0      108   0.200      40   0.00  0.01

11   762.25  762.18     6162      0       82   0.090      40   0.05  0.12
12   762.15  762.10     6093      0       64   0.110      30   0.00  0.00
13   762.10  762.08     6076      0       55   0.040      60   0.11  0.09
14   762.10  762.15     6136      0       59   0.310      90   0.44  0.40
15   762.15  762.15     6136      0       64   0.110      70   0.05  0.06

16   762.60  763.01     6873      0      199   0.300     580   0.66  0.72
17   762.93  762.72     6624      0      225   0.220     110   0.00  0.00
18   762.62  762.45     6393      0      155   0.270      50   0.00  0.00
19   762.38  762.26     6230      0      104   0.270      30   0.00  0.00
20   762.21  762.14     6128      0       74   0.300      20   0.00  0.00

21   762.09  762.03     6034      0       53   0.300      15   0.00  0.00
22   762.00  761.96     5967      0       40   0.280      15   0.00  0.00
23   761.94  761.91     5917      0       32   0.310      10   0.00  0.00
24   761.89  761.87     5876      0       26   0.200      10   0.00  0.02
25   761.86  761.83     5835      0       22   0.200      10   0.00  0.05

26   761.82  761.81     5815      0       19   0.250      10   0.00  0.00
27   761.79  761.76     5764      0       16   0.300       5   0.00  0.00
28   761.76  761.73     5734      0       13   0.120       5   0.00  0.00
29   761.73  761.71     5714      0       11   0.250       5   0.00  0.00
30   761.70  761.68     5683      0        9   0.340       5   0.00  0.00
31   761.68  761.66     5663      0        7   0.370       5   0.00  0.00

TOTAL                             0     5163   5.730    3685   2.63  2.62
AVERAGE   762.41                  0      167             119 NORMAL= 5.04

MAXIMUM   764.96        8922   DATE= 1    TOP CONSERVATION POOL    761.50
MINIMUM   761.66        5663   DATE=31    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     7309 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION