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                                    Keystone Lake
                          MONTHLY LAKE REPORT
                                 MAY 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  747.89  1363517
 1   747.63  747.14  1328769  11261    40048   0.250   22950   0.00  0.00
 2   746.80  746.23  1287448  11335    39796   0.300   19250   0.00  0.08
 3   745.86  745.27  1244861  11333    37098   0.230   15900   0.00  0.00
 4   745.37  747.19  1331085   6456    14667   0.190   58400   1.66  0.58
 5   747.91  748.77  1405103   2950     7613   0.210   45300   1.27  0.34

 6   748.91  748.74  1403680   8855    28251   0.270   28000   0.00  0.06
 7   748.57  748.17  1376668   8938    32362   0.320   19200   0.00  0.00
 8   747.99  747.58  1349155   8926    29798   0.330   16350   0.00  0.00
 9   747.35  746.88  1316854   9021    29721   0.320   13950   0.00  0.00
10   746.68  746.32  1291521   9013    26892   0.360   14350   0.32  0.64

11   746.21  745.92  1273516   9029    24896   0.190   15900   0.00  0.05
12   745.81  745.41  1251032  10447    25416   0.050   14400   0.03  0.01
13   745.23  744.90  1228659  11171    21629   0.250   10700   0.00  0.00
14   744.74  744.43  1208451  11198    20108   0.280   10300   0.00  0.00
15   744.30  744.02  1190826  11138    19968   0.290   10300   0.00  0.00

16   743.88  743.58  1172324  11198    19962   0.270   12000   0.00  0.00
17   743.54  743.75  1179464  11279    20018   0.170   23700   0.00  0.92
18   743.69  743.58  1172324  11393    20127   0.050   16850   1.13  0.21
19   743.63  743.76  1179885  11367    22140   0.270   26350   0.00  0.01
20   743.80  743.76  1179885  11323    28308   0.330   28700   0.00  0.00

21   743.80  743.51  1169384  11234    33570   0.250   28500   1.01  0.51
22   743.29  743.17  1155101  11479    39793   0.200   32850   0.00  0.01
23   743.55  744.01  1190395  11572    40155   0.210   58250   2.04  0.54
24   744.08  744.06  1192544  11492    40305   0.230   41700   0.00  0.00
25   744.01  743.57  1171904  11380    44240   0.280   33900   0.00  0.03

26   743.29  742.53  1128671  11429    51611   0.040   30050   0.07  0.23
27   742.13  741.40  1082898  11608    50286   0.200   27500   0.00  0.00
28   741.11  740.51  1047825  11600    44807   0.200   27500   0.00  0.01
29   740.24  739.65  1014756  11556    44119   0.230   27450   0.00  0.04
30   739.33  738.69   978750  11649    43503   0.140   25650   0.01  0.01
31   738.44  738.27   963263  11746    43000   0.250   35500   0.66  0.50

TOTAL                        324376   984207   7.160  791700   8.20  4.78
AVERAGE   744.35              10464    31749           25539 NORMAL= 4.42

MAXIMUM   748.99     1415527   DATE= 6    TOP CONSERVATION POOL    723.00
MINIMUM   738.27      963263   DATE=31    TOP FLOOD POOL           754.00

                      INFLOW VOLUME=  1570313 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION