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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 10


    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  761.83     5835
 1   761.83  761.82     5825      0       20   0.100      20   0.22  0.20
 2   761.82  761.80     5805      0       19   0.090      15   0.01  0.07
 3   761.80  761.78     5785      0       17   0.250      15   0.00  0.00
 4   761.78  761.77     5775      0       15   0.250      15   0.00  0.00
 5   761.76  761.74     5744      0       14   0.370      10   0.00  0.00

 6   761.74  761.73     5734      0       11   0.340      10   0.00  0.00
 7   761.74  761.69     5693      0       11   0.380       5   0.00  0.00
 8   761.68  761.66     5663      0        8   0.340       5   0.00  0.00
 9   761.66  761.65     5653      0        6   0.250       5   0.00  0.00
10   761.65  761.67     5673      0        6   0.060      10   0.03  0.03

11   761.68  761.68     5683      0        8   0.020       5   0.16  0.17
12   761.68  761.70     5704      0        8   0.060      20   0.01  0.01
13   761.74  761.79     5795      0       13   0.110      60   0.20  0.41
14   761.88  762.28     6247      0       45   0.040     270   0.42  0.53
15   762.31  762.27     6239      0       93   0.000     100   0.01  0.36

16   762.25  762.19     6170      0       82   0.030      50   0.01  0.01
17   762.17  762.08     6076      0       66   0.090      25   0.01  0.07
18   762.05  762.00     6008      0       47   0.170      15   0.00  0.00
19   761.98  765.79     9952      0      308   0.140    2300   0.00  0.00
20   767.72  767.11    11759      0     1658   0.040    2575   3.39  2.34

21   766.40  765.09     9079      0     1434   0.140     100   0.01  0.01
22   764.59  763.81     7662      0      797   0.300      90   0.00  0.00
23   763.53  763.25     7110      0      420   0.230      70   0.00  0.00
24   763.20  762.64     6555      0      254   0.400      50   0.00  0.00
25   762.54  762.38     6333      0      138   0.280      40   0.00  0.00

26   762.31  762.20     6179      0       92   0.210      30   0.00  0.00
27   762.16  762.09     6085      0       64   0.270      20   0.00  0.00
28   762.06  761.99     5998      0       47   0.230      10   0.14  0.08
29   761.96  761.91     5917      0       34   0.320       1   0.00  0.00
30   761.90  761.91     5917      0       27   0.280      35   0.00  0.00
31   761.93  761.97     5978      0       32   0.340      70   0.69  0.88

TOTAL                             0     5795   6.130    6046   5.31  5.17
AVERAGE   762.43                  0      187             195 NORMAL= 5.04

MAXIMUM   767.91       12966   DATE=20    TOP CONSERVATION POOL    761.50
MINIMUM   761.64        5643   DATE=10    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=    11992 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION