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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 APR 07


    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  763.06     8580
 1   762.94  762.71     8236      0      230   0.210      60   0.00  0.00
 2   762.60  762.44     7976      0      151   0.270      30   0.00  0.00
 3   762.33  762.23     7773      0      100   0.340       5   0.00  0.00
 4   762.17  762.09     7639      0       67   0.320       0   0.00  0.00
 5   762.03  761.96     7517      0       44   0.250       0   0.00  0.00

 6   761.94  761.88     7447      0       31   0.150       0   0.00  0.00
 7   761.86  761.81     7385      0       22   0.130       0   0.00  0.00
 8   761.80  761.78     7359      0       17   0.170       0   0.00  0.00
 9   761.77  761.73     7315      0       13   0.080       0   0.00  0.00
10   761.72  761.73     7315      0       11   0.140       5   0.00  0.00

11   761.72  761.70     7289      0       11   0.020       0   0.05  0.05
12   761.70  761.68     7271      0        8   0.220       0   0.01  0.01
13   761.68  761.86     7429      0       11   0.180     100   0.01  0.02
14   762.00  762.17     7716      0       50   0.050     200   0.55  0.78
15   762.16  762.12     7668      0       66   0.060      50   0.00  0.01

16   762.10  762.04     7590      0       54   0.220      20   0.00  0.00
17   762.02  762.00     7552      0       43   0.280      20   0.00  0.00
18   761.99  761.97     7526      0       39   0.040      30   0.23  0.23
19   761.96  761.93     7491      0       34   0.170      20   0.00  0.00
20   761.91  761.86     7429      0       27   0.270      10   0.00  0.00

21   761.85  761.82     7394      0       21   0.290      10   0.00  0.00
22   761.80  761.79     7368      0       17   0.360      10   0.00  0.00
23   761.79  761.77     7350      0       16   0.210      10   0.00  0.00
24   761.76  762.04     7590      0       21   0.130     150   0.00  0.00
25   762.27  762.30     7841      0       85   0.020     200   0.53  0.55

26   762.30  762.18     7725      0       87   0.170      40   0.00  0.01
27   762.15  762.09     7639      0       63   0.090      20   0.00  0.00
28   762.04  761.98     7534      0       45   0.160      10   0.00  0.00
29   761.96  761.91     7473      0       33   0.300      10   0.00  0.00
30   761.90  761.96     7517      0       29   0.310      50   0.00  0.00

TOTAL                             0     1446   5.610    1060   1.38  1.66
AVERAGE   761.98                  0       48              35 NORMAL= 3.46

MAXIMUM   763.06        8580   DATE= 1    TOP CONSERVATION POOL    761.50
MINIMUM   761.68        7271   DATE=13    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     2102 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION