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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 03


    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   761.60  761.60     7201      0        3   0.320       4   0.00  0.00
 2   761.59  761.57     7175      0        2   0.220       3   0.00  0.00
 3   761.57  761.56     7166      0        2   0.230       2   0.00  0.00
 4   761.57  761.56     7166      0        1   0.160       1   0.00  0.00
 5   761.56  761.54     7149      0        1   0.230       1   0.00  0.00

 6   761.54  761.53     7140      0        1   0.320       1   0.00  0.00
 7   761.52  761.51     7122      0        0   0.340       1   0.00  0.00
 8   761.50  761.51     7122      0        0   0.280       1   0.03  0.02
 9   761.50  761.50     7114      0        0   0.080       3   0.04  0.03
10   761.78  761.90     7464      0       19   0.230     125   1.33  1.14

11   761.88  761.84     7412      0       24   0.260      50   0.00  0.01
12   761.83  761.78     7359      0       18   0.290      20   0.00  0.00
13   761.77  761.75     7333      0       14   0.300      10   0.00  0.00
14   761.75  761.75     7333      0       13   0.150      20   0.40  0.32
15   761.74  761.74     7324      0       12   0.230      20   0.28  0.27

16   761.88  762.47     8005      0       55   0.140     300   1.15  1.11
17   763.10  762.93     8448      0      260   0.080     400   0.25  0.43
18   762.80  762.58     8111      0      194   0.090     200   0.00  0.00
19   762.47  763.15     8676      0      162   0.270     450   0.00  0.00
20   764.05  763.76     9333      0      570   0.220     900   1.61  1.32

21   763.49  763.07     8590      0      399   0.180      30   0.00  0.00
22   762.89  762.62     8149      0      217   0.140      10   0.00  0.00
23   762.53  762.35     7889      0      134   0.230       5   0.00  0.00
24   762.29  762.32     7860      0       96   0.090      90   0.02  0.04
25   762.32  762.22     7764      0       91   0.170      50   0.37  0.40

26   762.19  762.10     7648      0       68   0.140      20   0.00  0.00
27   762.07  761.98     7534      0       49   0.270      10   0.00  0.00
28   761.95  761.90     7464      0       32   0.280      10   0.00  0.00
29   761.89  761.84     7412      0       25   0.280       5   0.00  0.00
30   761.83  761.81     7385      0       20   0.360       5   0.00  0.00
31   761.80  761.76     7342      0       16   0.400       5   0.00  0.00

TOTAL                             0     2501   6.980    2752   5.48  5.09
AVERAGE   762.05                  0       81              89 NORMAL= 5.04

MAXIMUM   764.09        9697   DATE=20    TOP CONSERVATION POOL    761.50
MINIMUM   761.50        7114   DATE= 9    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     5459 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION