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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 APR 99


    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  762.01     7562
 1   762.01  762.00     7552      0       41   0.150      40   0.00  0.00
 2   762.00  761.99     7543      0       40   0.200      40   0.00  0.00
 3   762.02  762.08     7629      0       47   0.110     100   0.30  0.27
 4   762.08  762.08     7629      0       53   0.080      70   0.00  0.00
 5   762.08  762.11     7658      0       55   0.170      50   0.20  0.10

 6   762.10  762.07     7619      0       55   0.230      50   0.05  0.03
 7   762.06  762.02     7571      0       49   0.120      40   0.00  0.00
 8   762.03  762.01     7562      0       44   0.130      30   0.00  0.00
 9   762.00  761.98     7534      0       40   0.220      30   0.00  0.00
10   761.97  761.94     7499      0       36   0.150      20   0.00  0.00

11   761.93  761.90     7464      0       31   0.060      15   0.00  0.00
12   761.90  761.88     7447      0       27   0.040      15   0.00  0.00
13   761.87  761.89     7456      0       25   0.060      30   0.00  0.00
14   761.98  762.42     7956      0       62   0.070     300   1.15  1.01
15   762.51  762.56     8091      0      148   0.020     250   0.16  0.18

16   762.52  762.40     7937      0      134   0.140      50   0.00  0.00
17   762.35  762.26     7802      0      101   0.160      40   0.00  0.00
18   762.22  762.15     7696      0       75   0.000      30   0.00  0.00
19   762.13  762.08     7629      0       60   0.080      20   0.00  0.00
20   762.07  762.02     7571      0       49   0.060      20   0.00  0.00

21   762.02  761.99     7543      0       42   0.130      30   0.00  0.00
22   762.00  761.98     7534      0       39   0.090      30   0.24  0.27
23   761.98  761.96     7517      0       37   0.050      30   0.02  0.02
24   761.93  762.06     7610      0       35   0.020     100   0.00  0.01
25   764.00  770.00    17824      0     1154   0.000    6300   0.00  1.06

26   772.76  774.50    26822      0     1943   0.010    6450   3.84  2.84
27   774.13  773.17    23869      0     1968   0.010     500   1.30  0.98
28   772.76  771.46    20437      0     1931   0.010     150   0.00  0.00
29   770.83  769.55    17108      0     1870   0.030     100   0.00  0.00
30   768.76  767.06    13432      0     1762   0.010      50   0.00  0.00

TOTAL                             0    11952   2.610   14980   7.26  6.77
AVERAGE   763.85                  0      398             499 NORMAL= 3.46

MAXIMUM   774.50       26822   DATE=26    TOP CONSERVATION POOL    761.50
MINIMUM   761.86        7429   DATE=13    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=    29712 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION