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                                  Heyburn Lake
                          MONTHLY LAKE REPORT
                                 APR 98


    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  762.23     7773
 1   762.23  762.18     7725      0       78   0.180      50   0.00  0.00
 2   762.17  762.12     7668      0       67   0.250      50   0.00  0.00
 3   762.12  762.08     7629      0       58   0.340      50   0.13  0.12
 4   762.06  762.03     7581      0       50   0.120      50   0.00  0.00
 5   762.02  762.00     7552      0       43   0.049      25   0.00  0.00

 6   761.98  761.97     7526      0       38   0.260      25   0.00  0.00
 7   761.97  761.97     7526      0       37   0.310      50   0.04  0.06
 8   761.97  761.95     7508      0       37   0.260      25   0.19  0.16
 9   761.96  761.93     7491      0       34   0.180      25   0.00  0.00
10   761.93  761.91     7473      0       30   0.200      25   0.00  0.00

11   761.91  761.89     7456      0       28   0.220      25   0.00  0.00
12   761.87  761.86     7429      0       24   0.380      25   0.00  0.00
13   761.86  761.86     7429      0       23   0.360      25   0.00  0.00
14   761.86  761.84     7412      0       22   0.350      25   0.00  0.00
15   761.85  761.84     7412      0       22   0.350      25   0.00  0.00

16   761.84  761.82     7394      0       20   0.270      25   0.00  0.00
17   761.81  761.80     7377      0       18   0.160      25   0.00  0.00
18   761.80  761.80     7377      0       18   0.220      20   0.00  0.00
19   761.80  761.80     7377      0       18   0.220      20   0.00  0.00
20   761.78  761.79     7368      0       17   0.230      20   0.00  0.00

21   761.79  761.79     7368      0       17   0.090      20   0.00  0.02
22   761.79  761.77     7350      0       17   0.190      15   0.05  0.02
23   761.78  761.77     7350      0       15   0.200      15   0.00  0.00
24   761.77  761.75     7333      0       14   0.250      15   0.00  0.00
25   761.75  761.75     7333      0       13   0.440      15   0.00  0.01

26   761.80  763.19     8719      0       71   0.430     775   0.00  0.00
27   770.38  775.35    28807      0     1672   0.010   11800   5.72  5.33
28   774.92  773.81    25263      0     1983   0.040     200   0.30  0.41
29   773.17  771.89    21252      0     1944   0.050      10   0.00  0.00
30   771.15  769.72    17378      0     1881   0.080       5   0.00  0.00

TOTAL                             0     8307   6.689   13480   6.43  6.13
AVERAGE   763.37                  0      277             449 NORMAL= 3.46

MAXIMUM   775.35       28807   DATE=27    TOP CONSERVATION POOL    761.50
MINIMUM   761.74        7324   DATE=25    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=    26737 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION