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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 DEC 97


    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  761.78     7359      0       18   0.020       0   0.00  0.00
 2   761.78  761.80     7377      0       16   0.070      25   0.30  0.12
 3   761.82  761.90     7464      0       23   0.000      50   0.58  0.53
 4   761.90  761.88     7447      0       28   0.020      25   0.00  0.00
 5   761.87  761.83     7403      0       23   0.110      15   0.00  0.00

 6   761.82  761.80     7377      0       19   0.070      10   0.00  0.00
 7   761.79  761.80     7377      0       17   0.060      15   0.00  0.00
 8   761.82  761.83     7403      0       19   0.020      25   0.48  0.38
 9   761.84  761.86     7429      0       21   0.000      25   0.03  0.03
10   761.85  761.82     7394      0       21   0.090      25   0.01  0.01

11   761.81  761.80     7377      0       18   0.030      10   0.04  0.01
12   761.79  761.77     7350      0       16   0.040      10   0.00  0.01
13   761.76  761.75     7333      0       14   0.020      10   0.00  0.00
14   761.75  761.74     7324      0       12   0.060       5   0.00  0.00
15   761.73  761.72     7306      0       11   0.060       5   0.00  0.00

16   761.72  761.71     7298      0       11   0.150       5   0.00  0.00
17   761.71  761.70     7289      0       10   0.100       5   0.00  0.00
18   761.70  761.67     7263      0        8   0.090       5   0.00  0.00
19   761.66  761.66     7254      0        7   0.170       5   0.00  0.00
20   761.66  761.65     7245      0        7   0.150       5   0.00  0.00

21   761.73  762.60     8130      0       50   0.010     500   0.38  0.60
22   762.70  762.61     8139      0      177   0.000     175   1.00  0.64
23   762.56  763.51     9064      0      194   0.010     650   0.00  0.00
24   765.23  765.11    10907      0     1077   0.000    2000   1.71  1.75
25   764.66  763.91     9494      0      830   0.030     125   0.00  0.00

26   763.61  763.15     8676      0      437   0.030      25   0.00  0.00
27   762.98  762.71     8236      0      240   0.050      25   0.00  0.00
28   762.61  762.45     7985      0      154   0.090      25   0.00  0.00
29   762.42  762.30     7841      0      111   0.030      25   0.15  0.14
30   762.25  762.15     7696      0       81   0.090      25   0.00  0.00
31   762.14  762.06     7610      0       59   0.140      25   0.00  0.00

TOTAL                             0     3729   1.810    3880   4.68  4.22
AVERAGE   762.19                  0      120             125 NORMAL= 1.62

MAXIMUM   765.53       11435   DATE=24    TOP CONSERVATION POOL    761.50
MINIMUM   761.65        7245   DATE=20    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     7696 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION