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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 DEC 06


    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  759.36     5430
 1   759.35  759.35     5423      0        0   0.010      10   0.00  0.45
 2   759.34  759.33     5409      0        0   0.040       5   0.01  0.00
 3   759.33  759.32     5402      0        0   0.070       3   0.19  0.00
 4   759.32  759.31     5394      0        0   0.050       1   0.00  0.00
 5   759.31  759.30     5387      0        0   0.070       0   0.10  0.00

 6   759.31  759.31     5394      0        0   0.090       0   0.00  0.05
 7   759.33  759.31     5394      0        0   0.110       0   0.00  0.00
 8   759.30  759.30     5387      0        0   0.060       0   0.00  0.00
 9   759.30  759.30     5387      0        0   0.090       0   0.00  0.00
10   759.29  759.30     5387      0        0   0.130       0   0.00  0.00

11   759.30  759.30     5387      0        0   0.090       0   0.00  0.00
12   759.30  759.31     5394      0        0   0.110       0   0.00  0.00
13   759.31  759.31     5394      0        0   0.080       0   0.00  0.00
14   759.31  759.31     5394      0        0   0.090       0   0.00  0.00
15   759.31  759.31     5394      0        0   0.070       0   0.00  0.00

16   759.31  759.31     5394      0        0   0.090       0   0.00  0.00
17   759.31  759.31     5394      0        0   0.110       0   0.00  0.00
18   759.30  759.30     5387      0        0   0.080       0   0.00  0.00
19   759.30  759.33     5409      0        0   0.060       0   0.02  0.02
20   759.54  760.38     6185      0        0   0.010     200   1.20  1.28

21   760.53  760.62     6375      0        0   0.000     100   0.34  0.33
22   760.64  760.66     6406      0        0   0.080     100   0.00  0.00
23   760.66  760.67     6414      0        0   0.060      50   0.00  0.00
24   760.66  760.68     6422      0        0   0.050      30   0.00  0.00
25   760.68  760.68     6422      0        0   0.040      20   0.00  0.00

26   760.65  760.67     6414      0        0   0.120      10   0.00  0.00
27   760.67  760.66     6406      0        0   0.060       5   0.00  0.00
28   760.66  760.66     6406      0        0   0.140       3   0.00  0.00
29   760.66  760.78     6501      0        0   0.070      50   0.00  0.00
30   761.27  761.70     7289      0        2   0.010     350   1.22  0.98
31   761.76  761.78     7359      0       15   0.030     100   0.05  0.04

TOTAL                             0       16   2.170    1037   3.13  3.15
AVERAGE   759.90                  0        1              33 NORMAL= 1.62

MAXIMUM   761.79        7368   DATE=31    TOP CONSERVATION POOL    761.50
MINIMUM   759.28        5373   DATE=10    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     2057 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION