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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 APR 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  761.82     7394
 1   761.81  761.76     7342      0       17   0.300       5   0.00  0.00
 2   761.76  761.73     7315      0       13   0.380       5   0.00  0.00
 3   761.73  761.72     7306      0       11   0.330       5   0.00  0.00
 4   761.72  761.72     7306      0       11   0.160      10   0.03  0.02
 5   761.70  761.69     7280      0        9   0.250       5   0.00  0.00

 6   761.69  761.82     7394      0       12   0.210      50   0.04  0.09
 7   761.90  761.91     7473      0       28   0.050      60   0.49  0.40
 8   761.90  761.87     7438      0       28   0.270      40   0.00  0.00
 9   761.85  761.83     7403      0       22   0.070      20   0.00  0.00
10   761.82  761.81     7385      0       19   0.200      15   0.00  0.00

11   761.80  761.75     7333      0       16   0.220      10   0.00  0.00
12   761.75  761.73     7315      0       12   0.230       5   0.00  0.00
13   761.72  761.70     7289      0       10   0.250       5   0.00  0.00
14   761.70  761.67     7263      0        8   0.320       5   0.00  0.00
15   761.67  761.66     7254      0        7   0.390       5   0.00  0.00

16   761.69  761.72     7306      0        9   0.160      30   0.43  0.43
17   761.71  761.69     7280      0        9   0.200      10   0.00  0.01
18   761.69  761.69     7280      0        8   0.200      10   0.00  0.00
19   761.69  761.72     7306      0       10   0.310      25   0.02  0.02
20   761.75  761.75     7333      0       13   0.110      30   0.43  0.39

21   761.75  761.72     7306      0       12   0.270      10   0.00  0.00
22   761.72  761.70     7289      0       10   0.270       5   0.00  0.00
23   761.69  761.70     7289      0        9   0.200      10   0.00  0.00
24   761.70  761.72     7306      0        9   0.040      10   0.31  0.27
25   761.70  761.68     7271      0        9   0.340      10   0.00  0.00

26   761.68  761.66     7254      0        7   0.130      10   0.00  0.00
27   761.66  761.65     7245      0        6   0.230       5   0.00  0.00
28   761.63  761.63     7228      0        5   0.310       5   0.00  0.00
29   761.63  761.62     7219      0        5   0.160       5   0.00  0.00
30   761.62  761.61     7210      0        4   0.300       5   0.00  0.00

TOTAL                             0      347   6.860     425   1.75  1.63
AVERAGE   761.72                  0       12              14 NORMAL= 3.46

MAXIMUM   761.93        7491   DATE= 7    TOP CONSERVATION POOL    761.50
MINIMUM   761.60        7201   DATE=30    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=      843 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION