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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 15


    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  762.49     6072
 1   762.41  762.27     5885      0      110   0.290      20   0.00  0.00
 2   762.22  762.11     5749      0       73   0.280      15   0.00  0.00
 3   762.07  762.01     5664      0       50   0.310      15   0.00  0.00
 4   761.99  761.92     5603      0       36   0.270      10   0.00  0.00
 5   761.89  761.91     5596      0       27   0.310      30   0.00  0.00

 6   762.25  763.96     7440      0      304   0.230    1235   1.61  1.60
 7   763.89  763.77     7255      0      557   0.130     470   0.60  0.47
 8   764.38  764.63     8173      0      753   0.200    1220   0.60  0.53
 9   765.85  765.82     9586      0     1356   0.120    2070   1.01  1.10
10   765.47  765.85     9623      0     1338   0.080    1360   0.48  0.34

11   765.51  764.55     8085      0     1151   0.150     400   0.67  1.12
12   764.16  763.55     7041      0      634   0.320     120   0.00  0.00
13   763.32  763.04     6544      0      351   0.260     100   0.00  0.00
14   763.57  765.07     8666      0      713   0.110    1800   1.24  1.25
15   764.76  764.38     7897      0      934   0.190     550   0.00  0.00

16   764.08  764.21     7710      0      648   0.220     560   0.50  0.29
17   766.77  766.47    10443      0     1482   0.220    2900   1.44  1.01
18   765.79  764.69     8239      0     1261   0.290     160   0.00  0.00
19   764.26  763.81     7294      0      687   0.320     200   0.00  0.00
20   764.01  763.71     7197      0      586   0.130     540   0.53  0.68

21   763.50  763.14     6641      0      403   0.170     130   0.00  0.00
22   763.01  762.89     6412      0      257   0.220     140   0.00  0.00
23   762.85  766.57    10578      0      443   0.070    2550   0.33  0.32
24   770.24  771.19    18210      0     1838   0.070    5700   3.37  2.58
25   770.83  769.63    15335      0     1870   0.080     430   0.22  0.29

26   769.02  767.43    11796      0     1781   0.140      10   0.26  0.23
27   766.58  765.22     8850      0     1480   0.260      10   0.00  0.02
28   764.71  765.57     9279      0     1027   0.300    1250   0.00  0.00
29   765.28  764.91     8481      0     1117   0.160     720   0.17  0.55
30   764.71  764.06     7545      0      849   0.080     380   0.54  0.43
31   763.78  763.33     6826      0      498   0.180     140   0.00  0.00

TOTAL                             0    24616   6.160   25235  13.57 12.81
AVERAGE   764.57                  0      794             814 NORMAL= 5.04

MAXIMUM   771.32       18468   DATE=24    TOP CONSERVATION POOL    761.50
MINIMUM   761.88        5576   DATE= 5    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=    50053 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION