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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 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  761.96     7517
 1   762.00  762.99     8505      0      110   0.140     600   0.56  0.33
 2   763.68  765.21    11033      0      703   0.040    2000   1.12  1.76
 3   765.10  764.77    10498      0     1064   0.070     800   0.07  0.73
 4   764.56  763.95     9537      0      792   0.050     300   0.15  0.41
 5   763.68  763.25     8784      0      463   0.170     100   0.00  0.00

 6   763.08  762.81     8332      0      271   0.100      50   0.00  0.00
 7   764.25  768.73    15830      0     1162   0.140    4950   1.12  1.61
 8   768.79  770.52    18729      0     1830   0.020    3300   1.46  1.05
 9   770.15  769.07    16343      0     1844   0.100     650   0.81  0.93
10   768.48  766.95    13282      0     1746   0.170     200   0.00  0.07

11   766.17  765.14    10945      0     1391   0.120     200   0.03  0.10
12   764.68  763.93     9516      0      837   0.130     120   0.05  0.06
13   763.63  763.18     8709      0      444   0.300      50   0.00  0.00
14   763.01  762.74     8265      0      249   0.310      30   0.00  0.00
15   762.65  762.46     7995      0      161   0.290      30   0.00  0.00

16   762.40  762.27     7812      0      106   0.180      20   0.00  0.01
17   762.21  762.14     7687      0       74   0.280      20   0.00  0.00
18   762.11  762.03     7581      0       54   0.280      20   0.00  0.00
19   762.00  761.96     7517      0       39   0.250      10   0.00  0.00
20   761.94  761.91     7473      0       31   0.300      10   0.00  0.00

21   761.89  761.87     7438      0       26   0.270      10   0.00  0.00
22   761.85  761.82     7394      0       21   0.200      10   0.00  0.00
23   761.81  761.79     7368      0       18   0.170      10   0.00  0.00
24   761.79  761.95     7508      0       23   0.210     100   0.00  0.00
25   761.98  761.98     7534      0       38   0.030      50   0.73  0.83

26   761.98  761.95     7508      0       37   0.110      30   0.04  0.04
27   761.95  762.23     7773      0       46   0.090     180   0.07  0.07
28   762.30  762.35     7889      0       96   0.020     160   0.47  0.72
29   762.33  762.69     8216      0      117   0.120     290   0.34  0.25
30   762.78  762.69     8216      0      193   0.150     190   0.27  0.32
31   762.63  762.46     7995      0      156   0.080      50   0.00  0.01

TOTAL                             0    14143   4.890   14540   7.29  9.30
AVERAGE   763.54                  0      456             469 NORMAL= 5.04

MAXIMUM   770.52       18729   DATE= 8    TOP CONSERVATION POOL    761.50
MINIMUM   761.79        7368   DATE=24    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=    28840 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION