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                               Ft Gibson Lake, OK
                          MONTHLY LAKE REPORT
                                 APR 13


    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  557.40   434041
 1   557.34  558.06   448344   6039     6039   0.190   13350   0.00  0.00
 2   557.80  558.53   458873   7664     7664   0.170   13000   0.00  0.02
 3   558.36  559.26   475432   7623     7623   0.000   16000   0.51  0.56
 4   559.12  559.82   488424   7580     7580   0.030   14200   0.42  0.20
 5   559.61  559.89   490048   7895     7895   0.120    8900   0.00  0.00

 6   559.73  559.52   481464  10130    10130   0.270    5950   0.00  0.00
 7   559.28  559.09   471489  10154    10154   0.260    5250   0.00  0.00
 8   558.83  558.78   464473   8334     8334   0.200    4900   0.00  0.05
 9   558.59  558.45   457080   7580     7580   0.130    4000   0.00  0.00
10   558.40  558.73   463352   7613     7613   0.180   10750   0.12  0.10

11   558.87  559.29   476128   7634     9149   0.000   15750   0.78  0.90
12   559.33  559.41   478911   7686    11354   0.240   12900   0.00  0.00
13   559.40  559.62   483784   7680    11357   0.220   13950   0.00  0.00
14   559.73  560.01   492840   7600    11345   0.180   16150   0.03  0.05
15   559.71  559.96   491673   8649    12395   0.330   11850   0.00  0.00

16   559.56  560.13   495720  10153    11706   0.100   13800   0.00  0.00
17   559.86  560.19   497160  10085    10085   0.060   10900   0.00  0.00
18   562.48  564.43   606254   8062    19826   0.130   74850   1.77  2.78
19   564.48  563.96   593229  10554    45723   0.040   39350   0.00  0.01
20   563.66  562.87   564133  10694    48939   0.210   34450   0.00  0.00

21   562.53  561.68   533600  10805    47656   0.250   32450   0.00  0.00
22   561.08  559.85   489119   8899    40050   0.220   17850   0.00  0.00
23   559.07  558.28   453273   8194    33490   0.340   15400   0.00  0.05
24   557.40  556.60   417040   8412    31832   0.000   13700   0.00  0.03
25   555.72  555.62   396900   8229    19845   0.180    9850   0.00  0.00

26   555.28  555.65   397501   8067    13565   0.270   13850   0.01  0.03
27   555.64  555.93   403100   8275    19123   0.010   21950   0.76  0.50
28   555.95  555.93   403100   8512    25595   0.010   25800   0.00  0.01
29   555.88  555.81   400700   8580    28702   0.280   27700   0.00  0.00
30   555.87  555.91   402699  10332    28112   0.360   29350   0.00  0.00

TOTAL                        257714   560461   4.980  548150   4.40  5.29
AVERAGE   559.04               8590    18682           18272 NORMAL= 4.17

MAXIMUM   564.49      607922   DATE=19    TOP CONSERVATION POOL    554.00
MINIMUM   555.28      390101   DATE=26    TOP FLOOD POOL           582.00

                      INFLOW VOLUME=  1087239 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION