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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 APR 00


    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  761.90     7464
 1   761.89  761.88     7447      0       26   0.170      20   0.00  0.00
 2   761.88  761.87     7438      0       25   0.010      20   0.20  0.20
 3   761.86  761.83     7403      0       22   0.110      20   0.00  0.00
 4   761.82  761.80     7377      0       19   0.130      20   0.00  0.00
 5   761.78  761.78     7359      0       16   0.280      10   0.00  0.00

 6   761.78  761.76     7342      0       15   0.500      10   0.00  0.00
 7   761.76  761.75     7333      0       15   0.360      10   0.00  0.00
 8   761.73  761.71     7298      0       11   0.280      10   0.00  0.00
 9   761.71  761.68     7271      0        8   0.210      10   0.00  0.00
10   761.67  761.67     7263      0        7   0.280       5   0.00  0.00

11   761.66  761.68     7271      0        8   0.130       5   0.21  0.17
12   761.68  761.67     7263      0        8   0.180       5   0.00  0.00
13   761.68  761.67     7263      0        7   0.070       5   0.00  0.00
14   761.67  761.66     7254      0        7   0.150       5   0.00  0.00
15   761.67  761.68     7271      0        7   0.200      20   0.00  0.00

16   761.70  761.69     7280      0        9   0.090      20   0.26  0.27
17   761.69  761.68     7271      0        8   0.180      15   0.00  0.00
18   761.68  761.68     7271      0        8   0.230      15   0.00  0.00
19   761.69  761.68     7271      0        8   0.280      15   0.00  0.00
20   761.70  761.67     7263      0        8   0.280      10   0.16  0.12

21   761.66  761.65     7245      0        6   0.290      10   0.00  0.01
22   761.64  761.64     7236      0        5   0.310      10   0.00  0.00
23   761.63  761.64     7236      0        5   0.280       5   0.00  0.00
24   761.63  761.62     7219      0        5   0.230       5   0.00  0.02
25   761.62  761.61     7210      0        4   0.220       5   0.00  0.00

26   761.61  761.60     7201      0        3   0.250       5   0.00  0.00
27   761.63  761.60     7201      0        4   0.210       5   0.08  0.10
28   761.60  761.59     7192      0        3   0.360       5   0.00  0.00
29   761.59  761.59     7192      0        3   0.210       5   0.00  0.00
30   761.59  762.34     7879      0       19   0.200     400   0.00  0.00

TOTAL                             0      299   6.680     705   0.91  0.89
AVERAGE   761.71                  0       10              24 NORMAL= 3.46

MAXIMUM   762.34        7879   DATE=30    TOP CONSERVATION POOL    761.50
MINIMUM   761.58        7184   DATE=30    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     1398 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION