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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 12


    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  761.71     5464
 1   761.74  761.74     5484      0       12   0.250      25   0.25  0.29
 2   761.73  761.71     5464      0       11   0.300       5   0.00  0.00
 3   761.71  761.70     5457      0        9   0.220       5   0.00  0.00
 4   761.69  761.67     5437      0        8   0.330       5   0.00  0.00
 5   761.67  761.65     5424      0        7   0.150       5   0.00  0.00

 6   761.65  761.64     5417      0        6   0.330       5   0.00  0.00
 7   761.63  761.61     5397      0        5   0.200       0   0.00  0.00
 8   761.60  761.58     5378      0        3   0.180       0   0.00  0.00
 9   761.58  761.56     5364      0        2   0.200       0   0.00  0.00
10   761.55  761.54     5351      0        1   0.300       0   0.00  0.00

11   761.54  761.53     5344      0        1   0.290       5   0.00  0.00
12   761.55  761.55     5358      0        1   0.060      10   0.24  0.25
13   761.54  761.53     5344      0        1   0.140       0   0.00  0.00
14   761.53  761.52     5338      0        1   0.250       0   0.00  0.00
15   761.52  761.51     5331      0        0   0.230       0   0.00  0.00

16   761.50  761.49     5318      0        0   0.300       0   0.00  0.00
17   761.49  761.46     5298      0        0   0.320       0   0.00  0.00
18   761.46  761.44     5285      0        0   0.360       0   0.00  0.00
19   761.43  761.41     5265      0        0   0.370       0   0.00  0.00
20   761.40  761.39     5252      0        0   0.390       0   0.00  0.02

21   761.38  761.37     5238      0        0   0.140       0   0.00  0.02
22   761.36  761.34     5218      0        0   0.340       0   0.00  0.00
23   761.32  761.31     5199      0        0   0.360       0   0.00  0.00
24   761.28  761.28     5179      0        0   0.470       0   0.00  0.00
25   761.27  761.26     5165      0        0   0.230       0   0.00  0.00

26   761.27  761.25     5159      0        0   0.290       0   0.00  0.00
27   761.25  761.22     5139      0        0   0.280       0   0.00  0.00
28   761.21  761.22     5139      0        0   0.390       0   0.00  0.00
29   761.20  761.20     5126      0        0   0.330       0   0.00  0.04
30   761.19  761.18     5112      0        0   0.350       0   0.13  0.21
31   761.20  761.17     5106      0        0   0.380       0   0.24  0.13

TOTAL                             0       66   8.730      65   0.86  0.96
AVERAGE   761.45                  0        2               2 NORMAL= 5.04

MAXIMUM   761.74        5484   DATE= 1    TOP CONSERVATION POOL    761.50
MINIMUM   761.17        5106   DATE=31    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=      129 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION