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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 11


    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  762.16     6145
 1   762.12  762.09     6085      0       61   0.300      30   0.00  0.00
 2   762.08  762.05     6051      0       52   0.040      30   0.38  0.55
 3   762.03  761.96     5952      0       42   0.090      10   0.00  0.00
 4   761.94  761.89     5854      0       31   0.250       0   0.00  0.00
 5   761.88  761.85     5798      0       25   0.310       0   0.00  0.00

 6   761.84  761.80     5728      0       19   0.260       0   0.00  0.00
 7   761.79  761.77     5686      0       16   0.350       0   0.00  0.00
 8   761.76  761.74     5643      0       13   0.320       0   0.00  0.00
 9   761.73  761.71     5601      0       11   0.340       0   0.00  0.00
10   761.70  761.70     5587      0        9   0.370       0   0.00  0.00

11   761.69  761.80     5728      0       10   0.160      80   0.01  0.02
12   761.85  761.88     5840      0       23   0.090      90   0.79  0.84
13   761.88  761.85     5798      0       24   0.230      10   0.00  0.00
14   761.82  761.77     5686      0       19   0.170       0   0.00  0.00
15   761.76  761.73     5629      0       14   0.250       0   0.00  0.00

16   761.72  761.70     5587      0       10   0.310       0   0.00  0.00
17   761.69  761.68     5559      0        8   0.260       0   0.00  0.00
18   761.67  761.66     5531      0        7   0.260       0   0.05  0.05
19   761.66  761.65     5517      0        6   0.090      50   0.00  0.00
20   761.72  761.91     5882      0       15   0.130     100   0.43  0.40

21   761.97  761.98     5980      0       36   0.040     100   0.85  0.84
22   761.97  761.93     5910      0       35   0.320      20   0.03  0.03
23   761.91  761.89     5854      0       28   0.310      10   0.02  0.01
24   762.09  762.36     6316      0       64   0.100     300   0.62  0.74
25   762.65  762.67     6581      0      171   0.130     300   0.42  0.62

26   762.57  762.38     6333      0      142   0.300      10   0.00  0.02
27   762.31  762.20     6179      0       90   0.250      10   0.00  0.00
28   762.15  762.05     6051      0       62   0.210      10   0.00  0.00
29   762.00  761.95     5938      0       40   0.270       5   0.00  0.00
30   761.91  761.87     5826      0       28   0.430       0   0.00  0.00
31   761.85  761.82     5756      0       22   0.300       0   0.00  0.01

TOTAL                             0     1133   7.240    1165   3.60  4.13
AVERAGE   761.91                  0       37              38 NORMAL= 5.04

MAXIMUM   762.73        6632   DATE=25    TOP CONSERVATION POOL    761.50
MINIMUM   761.64        5503   DATE=19    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     2311 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION