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                                    Heyburn Lake
                          MONTHLY LAKE REPORT
                                 MAY 97


    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  761.96     7517
 1   761.95  761.90     7464      0       32   0.110      10   0.00  0.00
 2   761.98  762.29     7831      0       59   0.110     250   0.64  0.76
 3   762.26  762.20     7745      0       84   0.240      50   0.00  0.00
 4   762.18  762.12     7668      0       67   0.220      30   0.00  0.00
 5   762.10  762.03     7581      0       53   0.230      10   0.00  0.00

 6   762.02  761.97     7526      0       41   0.090      10   0.00  0.00
 7   761.97  761.93     7491      0       35   0.230      25   0.00  0.00
 8   762.07  762.35     7889      0       74   0.280     275   0.75  0.70
 9   762.34  762.26     7802      0       97   0.330      60   0.04  0.03
10   762.22  762.16     7706      0       76   0.150      30   0.00  0.00

11   762.13  762.07     7619      0       59   0.000      30   0.00  0.00
12   762.04  762.00     7552      0       46   0.470      20   0.10  0.10
13   761.99  761.95     7508      0       38   0.050      25   0.00  0.00
14   761.94  761.90     7464      0       32   0.240      15   0.00  0.00
15   761.89  761.87     7438      0       26   0.200      15   0.00  0.00

16   761.86  761.84     7412      0       22   0.270      15   0.00  0.00
17   761.82  761.81     7385      0       19   0.140      15   0.00  0.00
18   761.80  761.79     7368      0       18   0.120      15   0.00  0.00
19   761.79  761.79     7368      0       17   0.200      20   0.04  0.03
20   761.79  761.77     7350      0       16   0.050      10   0.27  0.24

21   761.77  761.75     7333      0       14   0.230      10   0.00  0.00
22   761.75  761.74     7324      0       12   0.160      10   0.00  0.00
23   761.74  761.73     7315      0       11   0.100      10   0.00  0.00
24   761.72  761.73     7315      0       11   0.140      20   0.03  0.01
25   761.75  761.74     7324      0       12   0.190      15   0.19  0.17

26   761.74  761.74     7324      0       12   0.100      20   0.02  0.06
27   761.74  761.72     7306      0       12   0.280       5   0.00  0.01
28   761.72  761.70     7289      0       10   0.100       5   0.00  0.00
29   761.70  761.66     7254      0        8   0.180       5   0.00  0.00
30   761.66  761.65     7245      0        7   0.180       5   0.05  0.05
31   761.65  761.63     7228      0        6   0.150       5   0.05  0.04

TOTAL                             0     1025   5.540    1040   2.18  2.20
AVERAGE   761.90                  0       33              34 NORMAL= 5.04

MAXIMUM   762.35        7889   DATE= 8    TOP CONSERVATION POOL    761.50
MINIMUM   761.63        7228   DATE=31    TOP FLOOD POOL           784.00

                      INFLOW VOLUME=     2063 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION