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                                  Oologah 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  641.54   669268
 1   641.42  641.26   659543      0     6127   0.090    1000   0.00  0.00
 2   641.21  640.84   645101      0     8251   0.120    1000   0.00  0.00
 3   640.57  640.18   622778      0    12096   0.050    1000   0.21  0.17
 4   639.97  639.48   599620      0    12040   0.010    1000   0.10  0.04
 5   639.35  638.79   577219      0    11978   0.250    1000   0.01  0.13

 6   638.60  638.27   560764      0     8777   0.260    1000   0.00  0.01
 7   638.18  638.10   555383      0     3637   0.280    1500   0.00  0.00
 8   638.12  638.20   558549      0      896   0.190    2000   0.00  0.00
 9   638.20  638.23   559497      0      897   0.220    2000   0.00  0.00
10   638.24  638.28   561081      0      897   0.250    1950   0.00  0.00

11   638.27  638.27   560764      0      898   0.350    1350   0.00  0.00
12   638.28  638.28   561081      0      898   0.260    1200   0.00  0.00
13   638.25  638.32   562346      0      898   0.250    1650   0.00  0.00
14   638.30  638.58   570574      0      898   0.060    5150   0.56  1.36
15   638.89  639.36   595682      0     5131   0.010   18100   0.06  0.55

16   639.50  639.91   613735      0    10032   0.250   19400   0.00  0.00
17   640.09  640.27   625822      0    10068   0.190   16350   0.01  0.00
18   640.32  640.36   628865      0    10081   0.130   12000   0.00  0.00
19   640.41  640.56   635630      0     8834   0.310   12650   0.00  0.00
20   640.66  640.77   642733      0     6984   0.340   10950   0.00  0.00

21   640.81  641.06   652595      0     6992   0.340   12200   0.00  0.00
22   641.14  641.39   664059      0     7006   0.130   13000   0.54  0.42
23   641.49  641.73   675868      0     7025   0.120   13050   0.09  0.34
24   641.77  641.76   676911      0     7033   0.020    7650   0.00  0.04
25   642.03  644.34   770989      0     2640   0.030   50150   1.90  0.72

26   645.31  647.63   900963      0        0   0.010   65700   2.27  1.45
27   648.39  649.60   983210      0        0   0.050   41800   2.74  1.01
28   649.98  650.48  1021149      0        0   0.220   19300   0.00  0.04
29   650.61  650.80  1035105      0        0   0.090    7300   0.00  0.01
30   650.87  650.82  1035978      0     3343   0.150    4200   0.00  0.01

TOTAL                             0   154355   5.030  346600   8.49  6.30
AVERAGE   641.53                  0     5145           11553 NORMAL= 3.63

MAXIMUM   650.87     1038158   DATE=30    TOP CONSERVATION POOL    638.00
MINIMUM   637.92      549802   DATE= 8    TOP FLOOD POOL           661.00

                      INFLOW VOLUME=   687471 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION