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                                  Oologah Lake
                          MONTHLY LAKE REPORT
                                 MAY 11


    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  641.74   676216
 1   641.73  641.52   668575      0     4109   0.300     500   0.00  0.00
 2   641.43  641.25   659195      0     4102   0.050     299   0.14  0.25
 3   641.15  640.99   650172      0     4096   0.070     200   0.00  0.00
 4   640.89  640.72   641040      0     4090   0.230     200   0.00  0.02
 5   640.62  640.42   630894      0     4084   0.300     200   0.00  0.00

 6   640.37  640.14   621425      0     4077   0.210     200   0.00  0.00
 7   640.06  639.89   613080      0     4071   0.350     200   0.00  0.00
 8   639.79  639.51   600606      0     4060   0.300     200   0.00  0.00
 9   639.37  639.21   590759      0     4049   0.340     200   0.00  0.00
10   639.13  639.02   584522      0     4040   0.390     200   0.00  0.00

11   638.88  638.75   575954      0     4032   0.220     200   0.00  0.01
12   638.59  638.49   567725      0     4024   0.190     200   0.33  0.77
13   638.51  638.59   570891      0     2577   0.170     200   0.00  0.01
14   638.54  638.45   566460      0     1574   0.110     200   0.00  0.00
15   638.40  638.38   564245      0     1572   0.180     200   0.00  0.00

16   638.32  638.26   560447      0      936   0.220     200   0.00  0.00
17   638.25  638.24   559814      0      449   0.280     200   0.00  0.00
18   638.23  638.23   559497      0      449   0.290     200   0.01  0.03
19   638.18  638.16   557282      0      356   0.090     200   0.36  0.27
20   638.16  638.23   559497      0      224   0.190     200   0.00  0.01

21   638.21  638.23   559497      0      224   0.030     200   1.18  0.62
22   638.22  638.33   562663      0      224   0.290    2000   0.00  0.00
23   638.24  639.86   612094      0      225   0.280   25000   0.00  0.06
24   640.83  642.49   702788      0      229   0.010   46000   0.75  1.63
25   642.85  643.39   735465      0      232   0.210   17000   0.58  0.51

26   643.45  643.45   737684      0     1408   0.220    2900   0.04  0.05
27   643.38  643.31   732507      0     4123   0.260    1715   0.00  0.00
28   643.24  643.12   725482      0     4118   0.160    1100   0.00  0.04
29   642.89  642.90   717466      0     4111   0.280    1000   0.00  0.00
30   642.73  642.66   708873      0     4105   0.460    1000   0.00  0.00
31   642.64  642.53   704221      0     4102   0.280    1000   0.00  0.01

TOTAL                             0    80072   6.960  103314   3.39  4.29
AVERAGE   640.22                  0     2583            3333 NORMAL= 5.09

MAXIMUM   643.50      739532   DATE=26    TOP CONSERVATION POOL    638.00
MINIMUM   638.11      555700   DATE=19    TOP FLOOD POOL           661.00

WATER SUPPLY:  WITHDRAWN   4572 AC-FT

                      INFLOW VOLUME=   204920 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION