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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 DEC 98


    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  761.87     7438
 1   761.87  761.86     7429      0       24   0.160      20   0.00  0.00
 2   761.85  761.84     7412      0       22   0.130      20   0.00  0.00
 3   761.84  761.96     7517      0       23   0.120      50   0.00  0.00
 4   762.97  763.42     8967      0      316   0.100    1050   1.29  1.11
 5   763.27  762.96     8477      0      329   0.110     100   0.00  0.00

 6   762.84  762.73     8255      0      213   0.190     100   0.00  0.00
 7   762.65  762.50     8034      0      164   0.050      50   0.38  0.32
 8   762.44  762.31     7851      0      116   0.020      50   0.00  0.00
 9   762.27  762.18     7725      0       83   0.060      50   0.00  0.00
10   762.14  762.08     7629      0       61   0.080      50   0.00  0.00

11   762.05  762.01     7562      0       47   0.070      50   0.00  0.00
12   761.99  761.96     7517      0       38   0.070      50   0.00  0.00
13   761.94  761.91     7473      0       32   0.040       0   0.00  0.00
14   761.90  761.88     7447      0       27   0.070       0   0.00  0.00
15   761.87  761.85     7420      0       23   0.060       0   0.00  0.00

16   761.85  761.83     7403      0       21   0.110       0   0.00  0.00
17   761.83  761.81     7385      0       19   0.090       0   0.00  0.00
18   761.81  761.84     7412      0       19   0.150       0   0.00  0.00
19   761.85  761.84     7412      0       22   0.020       0   0.00  0.17
20   761.85  761.85     7420      0       22   0.040      10   0.00  0.00

21   761.85  761.84     7412      0       22   0.000      10   0.44  0.18
22   761.82  761.80     7377      0       19   0.030      10   0.00  0.00
23   761.80  761.79     7368      0       17   0.050      10   0.00  0.00
24   761.79  761.78     7359      0       16   0.040      10   0.00  0.00
25   761.77  761.77     7350      0       15   0.050      10   0.00  0.00

26   761.77  761.77     7350      0       14   0.040      10   0.00  0.00
27   761.77  761.77     7350      0       15   0.080      10   0.00  0.00
28   761.77  761.77     7350      0       15   0.040      10   0.00  0.00
29   761.77  761.77     7350      0       15   0.060      10   0.00  0.00
30   761.77  761.76     7342      0       14   0.110      10   0.00  0.00
31   761.77  761.75     7333      0       14   0.090      10   0.00  0.00

TOTAL                             0     1798   2.330    1760   2.11  1.78
AVERAGE   762.01                  0       58              57 NORMAL= 1.62

MAXIMUM   763.52        9075   DATE= 4    TOP CONSERVATION POOL    761.50
MINIMUM   761.75        7333   DATE=31    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     3491 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION