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                                   Cheney Lake
                          MONTHLY LAKE REPORT
                                 APR 04


    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 1421.79   168880
 1  1421.79 1421.75   168500      0      244   0.140     150   0.00  0.00
 2  1421.75 1421.72   168214      0      244   0.180     150   0.00  0.00
 3  1421.71 1421.69   167929      0      244   0.230     150   0.00  0.00
 4  1421.65 1421.62   167264      0      244   0.270     150   0.00  0.00
 5  1421.61 1421.61   167169      0       81   0.170     140   0.00  0.00

 6  1421.61 1421.62   167264      0        0   0.260     130   0.00  0.00
 7  1421.64 1421.63   167359      0        0   0.120     150   0.09  0.02
 8  1421.65 1421.63   167359      0        0   0.210     110   0.00  0.01
 9  1421.63 1421.67   167740      0        0   0.230     300   0.00  0.00
10  1421.70 1421.69   167929      0        0   0.040     200   0.44  0.36

11  1421.70 1421.69   167929      0        0   0.110     150   0.09  0.04
12  1421.71 1421.74   168404      0        0   0.130     120   0.00  0.00
13  1421.72 1421.69   167929      0        0   0.100     110   0.00  0.00
14  1421.69 1421.65   167550      0        0   0.150     100   0.00  0.00
15  1421.67 1421.69   167929      0        0   0.360     100   0.00  0.00

16  1421.69 1421.70   168024      0        0   0.230     100   0.00  0.00
17  1421.71 1421.65   167550      0        0   0.330     100   0.00  0.01
18  1421.67 1421.73   168309      0        0   0.330     100   0.00  0.00
19  1421.73 1421.70   168024      0        0   0.160     100   0.01  0.00
20  1421.73 1421.76   168595      0        0   0.220     100   0.36  0.32

21  1421.77 1421.75   168500      0        0   0.150     100   0.00  0.01
22  1421.76 1421.76   168595      0        0   0.190     100   0.03  0.01
23  1421.81 1421.83   169259      0        0   0.080     550   0.00  0.01
24  1421.85 1421.86   169545      0        0   0.270     300   1.42  0.54
25  1421.88 1421.87   169640      0        0   0.110     200   0.00  0.01

26  1421.90 1421.88   169735      0        0   0.240     150   0.00  0.00
27  1421.88 1421.83   169259      0      146   0.250     100   0.00  0.00
28  1421.81 1421.75   168500      0      244   0.360     100   0.00  0.00
29  1421.75 1421.78   168785      0      244   0.470     200   0.00  0.00
30  1421.74 1421.75   168500      0      244   0.110     350   0.03  0.02

TOTAL                             0     1937   6.200    4860   2.47  1.36
AVERAGE  1421.72                  0       65             162 NORMAL= 2.32

MAXIMUM  1421.90      169925   DATE=26    TOP CONSERVATION POOL   1421.60
MINIMUM  1421.60      167074   DATE= 5    TOP FLOOD POOL          1429.00

WATER SUPPLY:  WITHDRAWN   2785 AC-FT

                      INFLOW VOLUME=     9640 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION