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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 00


    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  762.34     7879
 1   763.58  763.50     9053      0      411   0.120    1000   2.30  2.16
 2   763.35  762.95     8467      0      340   0.120      50   0.00  0.00
 3   762.86  762.58     8111      0      199   0.220      25   0.00  0.00
 4   762.51  762.34     7879      0      127   0.200      15   0.00  0.00
 5   762.28  762.17     7716      0       84   0.150      10   0.00  0.00

 6   770.08  771.77    21025      0     1588   0.080    8300   7.05  5.60
 7   771.24  770.02    17859      0     1885   0.150     300   0.02  0.18
 8   769.36  767.96    14689      0     1805   0.370     250   0.00  0.00
 9   767.31  766.42    12581      0     1666   0.270     600   0.70  0.70
10   765.99  764.60    10298      0     1255   0.140     100   0.00  0.00

11   764.15  763.52     9075      0      630   0.330      50   0.00  0.00
12   763.28  762.90     8419      0      330   0.360      20   0.00  0.00
13   762.76  762.52     8053      0      183   0.170      10   0.00  0.00
14   762.43  762.27     7812      0      113   0.300      10   0.00  0.00
15   762.21  762.14     7687      0       75   0.330      10   0.00  0.00

16   762.10  762.04     7590      0       54   0.140      10   0.37  0.31
17   762.02  761.96     7517      0       41   0.160      10   0.00  0.03
18   761.96  761.91     7473      0       33   0.220      10   0.00  0.00
19   761.89  761.85     7420      0       26   0.270       5   0.00  0.00
20   761.84  761.81     7385      0       20   0.140       5   0.00  0.00

21   761.80  761.78     7359      0       17   0.310       5   0.00  0.00
22   761.77  761.76     7342      0       14   0.010       5   0.00  0.00
23   761.75  761.73     7315      0       13   0.470       5   0.00  0.00
24   761.73  761.75     7333      0       11   0.390      25   0.00  0.00
25   761.76  761.79     7368      0       15   0.310      30   0.88  1.26

26   761.84  762.14     7687      0       36   0.130     200   0.40  0.53
27   762.69  764.26     9897      0      426   0.200    1550   1.21  1.04
28   763.96  763.41     8956      0      556   0.230     100   0.00  0.14
29   763.21  762.83     8351      0      301   0.360      10   0.00  0.00
30   762.69  762.48     8014      0      170   0.440       5   0.00  0.00
31   762.42  762.24     7783      0      106   0.380       5   0.00  0.00

TOTAL                             0    12530   7.470   12730  12.93 11.95
AVERAGE   763.34                  0      404             411 NORMAL= 5.04

MAXIMUM   771.78       21044   DATE= 6    TOP CONSERVATION POOL    761.50
MINIMUM   761.72        7306   DATE=24    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=    25250 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION