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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 JUL 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  770.28    18311
 1   769.66  768.19    15028      0     1818   0.110     170   0.14  0.13
 2   767.37  765.80    11774      0     1621   0.180      50   0.03  0.09
 3   765.18  764.23     9862      0     1032   0.170      25   0.00  0.01
 4   763.88  763.43     8978      0      534   0.200      80   0.00  0.00
 5   763.23  763.08     8601      0      329   0.210     150   0.84  0.31

 6   763.04  762.80     8322      0      256   0.190     125   0.06  0.18
 7   762.69  762.51     8043      0      171   0.300      50   0.00  0.00
 8   762.43  762.30     7841      0      115   0.320      20   0.00  0.00
 9   762.25  762.33     7870      0       86   0.310     100   0.00  0.00
10   764.39  766.11    12171      0     1068   0.120    3240   0.81  1.51

11   765.51  764.50    10180      0     1161   0.140     170   0.00  0.01
12   764.11  763.76     9333      0      642   0.240     210   0.00  0.00
13   766.96  769.77    17458      0     1558   0.120    5650   2.62  2.66
14   769.26  767.97    14703      0     1802   0.170     440   0.04  0.11
15   767.26  765.75    11711      0     1609   0.310     110   0.00  0.00

16   765.13  764.18     9803      0     1010   0.290      60   0.00  0.00
17   763.82  763.30     8838      0      508   0.310      40   0.00  0.00
18   763.08  762.78     8303      0      272   0.300      30   0.00  0.00
19   762.67  762.50     8034      0      168   0.350      20   0.00  0.00
20   762.42  762.29     7831      0      113   0.320      20   0.00  0.00

21   762.24  762.15     7696      0       78   0.300      20   0.00  0.00
22   762.11  762.06     7610      0       57   0.300      20   0.00  0.00
23   762.04  762.01     7562      0       46   0.230      20   0.05  0.37
24   761.99  761.95     7508      0       38   0.150      20   0.00  0.00
25   761.94  761.91     7473      0       31   0.270      20   0.00  0.05

26   761.90  761.86     7429      0       27   0.280      20   0.00  0.00
27   761.86  761.84     7412      0       22   0.290      20   0.00  0.00
28   761.83  761.81     7385      0       20   0.290      10   0.00  0.00
29   761.80  761.81     7385      0       18   0.300      20   0.00  0.00
30   761.82  761.83     7403      0       20   0.200      30   0.16  0.55
31   761.83  761.82     7394      0       20   0.190      20   0.04  0.06

TOTAL                             0    16249   7.460   10980   4.79  6.04
AVERAGE   763.50                  0      524             354 NORMAL= 3.01

MAXIMUM   770.28       18311   DATE= 1    TOP CONSERVATION POOL    761.50
MINIMUM   761.79        7368   DATE=29    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=    21779 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION