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                                    Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 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  769.72    17378
 1   768.88  767.25    13697      0     1774   0.120       5   0.00  0.00
 2   766.41  765.07    10857      0     1435   0.250       5   0.00  0.02
 3   764.56  763.79     9365      0      785   0.160       5   0.00  0.00
 4   763.57  763.08     8601      0      408   0.270       5   0.00  0.00
 5   763.00  762.86     8380      0      251   0.260     125   0.75  0.59

 6   762.79  763.34     8881      0      228   0.100     475   0.00  0.00
 7   763.73  763.47     9021      0      472   0.150     550   0.85  0.61
 8   763.32  762.96     8477      0      335   0.260      75   0.00  0.00
 9   762.83  763.06     8580      0      225   0.270     275   0.00  0.00
10   763.23  763.04     8558      0      317   0.090     325   0.40  0.72

11   762.93  762.73     8255      0      226   0.280      75   0.00  0.00
12   762.64  762.47     8005      0      159   0.360      50   0.00  0.00
13   762.43  762.29     7831      0      111   0.390      50   0.00  0.00
14   762.26  762.29     7831      0       96   0.350      50   0.00  0.00
15   762.26  762.11     7658      0       74   0.290      25   0.00  0.00

16   762.09  762.01     7562      0       52   0.360      25   0.25  0.10
17   761.99  761.95     7508      0       38   0.330      25   0.00  0.00
18   761.94  761.91     7473      0       32   0.270      25   0.00  0.00
19   761.91  761.88     7447      0       27   0.300      25   0.00  0.00
20   761.87  761.85     7420      0       23   0.160      15   0.00  0.00

21   761.84  761.83     7403      0       21   0.160      15   0.03  0.01
22   761.82  761.81     7385      0       19   0.260      15   0.00  0.00
23   761.81  761.80     7377      0       18   0.220      15   0.00  0.00
24   761.80  761.78     7359      0       17   0.120      15   0.00  0.00
25   761.82  761.85     7420      0       20   0.300      50   0.98  0.71

26   761.99  762.23     7773      0       55   0.110     225   0.56  0.74
27   762.23  762.17     7716      0       76   0.160      50   0.00  0.00
28   762.15  762.06     7610      0       61   0.220      25   0.00  0.00
29   762.04  761.98     7534      0       44   0.320      25   0.00  0.00
30   761.96  761.92     7482      0       34   0.320      15   0.00  0.00
31   761.90  761.87     7438      0       27   0.450      15   0.00  0.00

TOTAL                             0     7459   7.660    2675   3.82  3.50
AVERAGE   762.60                  0      241              86 NORMAL= 5.04

MAXIMUM   769.72       17378   DATE= 1    TOP CONSERVATION POOL    761.50
MINIMUM   761.78        7359   DATE=24    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     5306 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION