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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 13


    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  761.44     5285
 1   761.43  761.41     5265      0        5   0.340       0   0.00  0.00
 2   761.39  761.37     5238      0        5   0.210       0   0.00  0.00
 3   761.36  761.35     5225      0        2   0.060       0   0.04  0.12
 4   761.35  761.34     5218      0        0   0.270       0   0.00  0.00
 5   761.34  761.34     5218      0        0   0.060       0   0.01  0.01

 6   761.34  761.34     5218      0        0   0.090       0   0.00  0.00
 7   761.34  761.35     5225      0        0   0.190       0   0.00  0.00
 8   761.35  761.34     5218      0        0   0.220       5   0.00  0.00
 9   761.40  761.49     5318      0        0   0.250      50   0.64  0.77
10   761.52  761.54     5351      0        1   0.060      20   0.01  0.01

11   761.55  761.55     5358      0        1   0.160      10   0.00  0.00
12   761.55  761.55     5358      0        1   0.270       5   0.00  0.00
13   761.55  761.49     5318      0       20   0.240       5   0.00  0.00
14   761.47  761.42     5271      0       30   0.360       5   0.00  0.00
15   761.40  761.42     5271      0        3   0.400       5   0.00  0.00

16   761.42  761.42     5271      0        3   0.060       5   0.43  0.36
17   761.42  761.40     5258      0        3   0.070       5   0.03  0.02
18   761.40  761.39     5252      0        3   0.090       5   0.00  0.00
19   761.45  761.46     5298      0        3   0.200      30   0.47  0.41
20   761.46  761.46     5298      0        3   0.170      10   0.07  0.24

21   761.46  761.49     5318      0        8   0.100      10   0.01  0.08
22   761.51  761.48     5311      0       13   0.020      10   0.34  0.37
23   761.45  761.45     5291      0        9   0.280       5   0.00  0.01
24   761.45  761.45     5291      0        3   0.030       5   0.14  0.17
25   761.45  761.45     5291      0        3   0.230       5   0.00  0.00

26   761.45  761.43     5278      0        3   0.280       5   0.00  0.00
27   761.43  761.42     5271      0        3   0.200       5   0.00  0.00
28   761.41  761.39     5252      0        3   0.290       0   0.00  0.00
29   761.39  761.42     5271      0        3   0.190      20   0.00  0.00
30   761.93  763.31     6807      0      160   0.100     950   1.27  1.67
31   763.44  763.16     6661      0      380   0.130     300   0.00  0.38

TOTAL                             0      667   5.620    1475   3.46  4.62
AVERAGE   761.54                  0       22              48 NORMAL= 5.04

MAXIMUM   763.44        6934   DATE=31    TOP CONSERVATION POOL    761.50
MINIMUM   761.34        5218   DATE= 8    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     2926 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION