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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 APR 13


    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  761.49     5318
 1   761.49  761.48     5311      0        0   0.210       0   0.00  0.00
 2   761.48  761.56     5364      0        0   0.170      30   0.22  0.22
 3   761.60  761.88     5576      0        8   0.020     120   1.01  0.89
 4   762.14  762.46     6047      0       84   0.020     350   0.63  0.77
 5   762.46  762.37     5970      0      122   0.150     100   0.00  0.00

 6   762.32  762.23     5851      0       94   0.230      75   0.00  0.00
 7   762.20  762.13     5766      0       71   0.210      25   0.00  0.00
 8   762.07  762.01     5664      0       51   0.070      10   0.00  0.00
 9   761.99  761.95     5623      0       38   0.110      20   0.00  0.00
10   761.93  761.91     5596      0       32   0.120      10   0.04  0.06

11   761.89  761.86     5563      0       26   0.060      10   0.14  0.25
12   761.84  761.82     5537      0       21   0.180      10   0.00  0.00
13   761.81  761.81     5530      0       19   0.200      10   0.12  0.10
14   761.81  761.79     5517      0       17   0.200      10   0.08  0.14
15   761.78  761.76     5497      0       15   0.340       5   0.04  0.01

16   761.75  761.74     5484      0       13   0.190       5   0.00  0.01
17   761.73  761.76     5497      0       12   0.060      20   0.00  0.00
18   762.20  762.84     6369      0      136   0.110     580   1.68  1.71
19   762.77  762.59     6157      0      189   0.140      90   0.01  0.00
20   762.50  762.35     5953      0      129   0.240      50   0.00  0.00

21   762.29  762.20     5826      0       88   0.250      20   0.00  0.00
22   762.17  762.06     5707      0       65   0.200      10   0.00  0.00
23   762.05  761.99     5649      0       46   0.250      10   0.19  0.12
24   761.96  761.91     5596      0       34   0.050      10   0.00  0.03
25   761.90  761.87     5570      0       26   0.190      10   0.00  0.00

26   761.84  761.80     5523      0       38   0.250      25   0.00  0.00
27   761.78  761.69     5450      0       59   0.020      20   0.18  0.22
28   761.66  761.60     5391      0       51   0.040      10   0.00  0.01
29   761.57  761.50     5325      0       46   0.260      10   0.00  0.00
30   761.47  761.44     5285      0       19   0.360       5   0.00  0.00

TOTAL                             0     1549   4.900    1660   4.34  4.54
AVERAGE   761.95                  0       52              55 NORMAL= 3.46

MAXIMUM   762.84        6369   DATE=18    TOP CONSERVATION POOL    761.50
MINIMUM   761.44        5285   DATE=30    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     3293 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION