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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 DEC 99


    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  761.49     7105
 1   761.49  761.48     7096      0        0   0.190       0   0.00  0.00
 2   761.48  761.67     7263      0        1   0.290     100   0.00  0.00
 3   761.80  761.89     7456      0       19   0.120     100   1.15  0.97
 4   761.94  761.94     7499      0       32   0.110      50   1.22  0.98
 5   761.94  761.94     7499      0       33   0.010      35   1.85  0.53

 6   761.94  761.94     7499      0       33   0.060      35   0.00  0.00
 7   761.94  762.18     7725      0       50   0.150     100   0.00  0.00
 8   762.15  762.05     7600      0       60   0.190      80   0.00  0.00
 9   762.14  763.30     8838      0      142   0.050     750   0.70  0.81
10   763.53  763.25     8784      0      403   0.020     350   0.50  1.01

11   763.06  762.78     8303      0      266   0.080      50   0.00  0.00
12   762.66  762.47     8005      0      165   0.000      30   0.00  0.00
13   762.41  762.26     7802      0      108   0.030      20   0.00  0.00
14   762.20  762.13     7677      0       72   0.070      10   0.00  0.00
15   762.07  762.01     7562      0       50   0.380      10   0.00  0.01

16   761.98  761.93     7491      0       35   0.120      10   0.00  0.00
17   761.91  761.87     7438      0       28   0.160      10   0.00  0.00
18   761.86  761.83     7403      0       22   0.090      10   0.00  0.00
19   761.82  761.80     7377      0       19   0.050       5   0.00  0.00
20   761.79  761.77     7350      0       16   0.060       5   0.00  0.00

21   761.77  761.75     7333      0       14   0.100       5   0.00  0.00
22   761.74  761.74     7324      0       12   0.080       5   0.00  0.00
23   761.73  761.73     7315      0       12   0.090       5   0.00  0.00
24   761.72  761.71     7298      0       11   0.090       5   0.00  0.00
25   761.71  761.70     7289      0        9   0.070       5   0.00  0.00

26   761.70  761.70     7289      0        9   0.090       5   0.00  0.00
27   761.70  761.66     7254      0        8   0.220       0   0.00  0.00
28   761.66  761.65     7245      0        6   0.100       0   0.00  0.00
29   761.65  761.65     7245      0        6   0.130       0   0.00  0.00
30   761.65  761.65     7245      0        6   0.220       0   0.00  0.00
31   761.65  761.65     7245      0        6   0.120       0   0.00  0.00

TOTAL                             0     1653   3.540    1790   5.42  4.31
AVERAGE   761.97                  0       53              58 NORMAL= 1.62

MAXIMUM   763.53        9085   DATE=10    TOP CONSERVATION POOL    761.50
MINIMUM   761.47        7087   DATE= 2    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     3550 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION