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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 JUL 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  762.71     8236
 1   762.60  762.43     7966      0      151   0.280      20   0.00  0.00
 2   762.36  762.28     7822      0      105   0.250      40   0.00  0.00
 3   762.25  762.16     7706      0       80   0.190      30   0.08  0.15
 4   762.12  762.04     7590      0       57   0.260      10   0.00  0.02
 5   762.02  761.96     7517      0       41   0.370      10   0.00  0.00

 6   761.98  761.89     7456      0       32   0.350      10   0.00  0.00
 7   761.88  762.04     7590      0       41   0.280      50   0.00  0.00
 8   762.02  761.96     7517      0       41   0.330      10   0.00  0.00
 9   761.93  761.89     7456      0       30   0.370      10   0.00  0.00
10   761.74  761.69     7280      0       13   0.410       5   0.00  0.00

11   761.69  761.67     7263      0        8   0.430       5   0.00  0.00
12   761.66  761.64     7236      0        6   0.380       5   0.00  0.01
13   761.64  761.61     7210      0        5   0.350       5   0.00  0.00
14   761.61  761.60     7201      0        3   0.390       5   0.00  0.00
15   761.59  761.57     7175      0        2   0.350       5   0.00  0.00

16   761.56  761.55     7157      0        1   0.570       5   0.00  0.00
17   761.54  761.53     7140      0        1   0.400       5   0.00  0.01
18   761.53  761.52     7131      0        0   0.170       5   0.00  0.00
19   761.51  761.50     7114      0        0   0.270       5   0.00  0.00
20   761.50  761.51     7122      0        0   0.410       5   0.00  0.00

21   761.60  761.60     7201      0        3   0.060      50   1.18  1.32
22   761.60  761.60     7201      0        3   0.290      10   0.69  0.73
23   761.60  761.60     7201      0        3   0.230       5   0.06  0.05
24   761.60  761.60     7201      0        3   0.160       5   0.00  0.00
25   761.60  761.60     7201      0        3   0.330       5   0.00  0.07

26   761.60  761.85     7420      0        9   0.200     100   0.00  0.08
27   761.95  761.93     7491      0       33   0.350     100   0.00  0.30
28   761.91  761.87     7438      0       28   0.130      10   0.00  0.08
29   761.86  761.83     7403      0       22   0.170      10   0.00  0.06
30   761.82  761.79     7368      0       18   0.240      10   0.00  0.00
31   761.78  761.76     7342      0       15   0.300      10   0.00  0.00

TOTAL                             0      758   9.270     560   2.01  2.88
AVERAGE   761.78                  0       24              18 NORMAL= 3.01

MAXIMUM   762.71        8236   DATE= 1    TOP CONSERVATION POOL    761.50
MINIMUM   761.50        7114   DATE=20    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     1111 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION