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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 16


    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  762.06     5906
 1   762.04  762.00     5855      0       46   0.270      30   0.00  0.00
 2   761.98  761.95     5820      0       37   0.310      25   0.00  0.01
 3   761.93  761.91     5793      0       31   0.140      20   0.00  0.00
 4   761.90  761.87     5765      0       27   0.250      15   0.00  0.00
 5   761.86  761.84     5744      0       23   0.360      10   0.00  0.00

 6   761.83  761.77     5695      0       23   0.300       5   0.00  0.00
 7   761.72  761.62     5591      0       18   0.290       3   0.00  0.00
 8   761.58  761.51     5515      0       11   0.340       1   0.00  0.00
 9   761.46  761.40     5439      0       10   0.250       1   0.00  0.00
10   761.37  761.34     5397      0       10   0.200       1   0.07  0.04

11   761.35  761.37     5418      0        6   0.380       1   0.00  0.00
12   761.37  761.38     5425      0        0   0.330       1   0.00  0.03
13   761.38  761.38     5425      0        0   0.330       1   0.00  0.00
14   761.40  761.38     5425      0        0   0.400       1   0.00  0.00
15   761.38  761.38     5425      0        0   0.320       1   0.00  0.00

16   761.42  761.48     5494      0        0   0.220      20   0.25  0.25
17   761.53  761.55     5543      0        1   0.070      20   0.67  0.75
18   761.56  761.59     5570      0        2   0.150      15   0.00  0.00
19   761.59  761.62     5591      0        3   0.200      15   0.00  0.00
20   761.64  761.65     5612      0        5   0.080      20   0.32  0.28

21   761.66  761.67     5626      0        7   0.120      20   0.02  0.01
22   761.67  761.67     5626      0        7   0.200      15   0.00  0.00
23   761.67  761.73     5668      0        9   0.270      30   0.01  0.03
24   761.73  762.00     5855      0       16   0.140     100   0.45  0.37
25   763.01  763.15     6849      0      270   0.240     750   0.38  0.88

26   763.03  762.75     6491      0      254   0.320     100   0.55  0.28
27   762.63  762.46     6245      0      159   0.240      50   0.00  0.00
28   762.37  762.24     6059      0      103   0.230      30   0.00  0.00
29   762.19  762.10     5940      0       69   0.260      20   0.00  0.00
30   762.06  762.01     5863      0       48   0.330      15   0.00  0.01
31   761.98  761.94     5813      0       37   0.150      15   0.01  0.02

TOTAL                             0     1231   7.690    1351   2.73  2.96
AVERAGE   761.80                  0       40              44 NORMAL= 5.04

MAXIMUM   763.23        6927   DATE=25    TOP CONSERVATION POOL    761.50
MINIMUM   761.33        5390   DATE=10    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     2680 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION