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                                   Cheney Lake
                          MONTHLY LAKE REPORT
                                 DEC 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 1421.85   169449
 1  1421.84 1421.84   169354      0      244   0.050      70   0.00  0.06
 2  1421.85 1421.79   168880      0      244   0.050     100   0.00  0.04
 3  1421.79 1421.80   168975      0      150   0.050     200   0.00  0.00
 4  1421.80 1421.81   169070      0        0   0.050     100   0.00  0.00
 5  1421.80 1421.86   169545      0        0   0.050     250   0.00  0.00

 6  1421.87 1421.90   169925      0       92   0.050     275   0.15  0.15
 7  1421.88 1421.85   169449      0      245   0.050     250   0.00  0.00
 8  1421.82 1421.82   169164      0      244   0.050     175   0.00  0.00
 9  1421.81 1421.83   169259      0      244   0.040     150   0.00  0.00
10  1421.82 1421.77   168690      0      168   0.050     125   0.00  0.00

11  1421.77 1421.77   168690      0      129   0.050     100   0.00  0.00
12  1421.78 1421.79   168880      0      129   0.050      90   0.00  0.00
13  1421.79 1421.73   168309      0      206   0.050      80   0.00  0.00
14  1421.72 1421.66   167645      0      244   0.050      75   0.00  0.00
15  1421.65 1421.63   167359      0      244   0.050      75   0.00  0.00

16  1421.63 1421.63   167359      0       86   0.050      75   0.00  0.00
17  1421.63 1421.65   167550      0        0   0.050      75   0.00  0.00
18  1421.66 1421.67   167740      0        0   0.050      75   0.00  0.00
19  1421.65 1421.62   167264      0        0   0.050      75   0.00  0.00
20  1421.62 1421.68   167835      0        0   0.050      75   0.00  0.00

21  1421.69 1421.67   167740      0        0   0.050      75   0.00  0.00
22  1421.70 1421.66   167645      0        0   0.050      70   0.00  0.00
23  1421.66 1421.66   167645      0        0   0.050      70   0.00  0.00
24  1421.65 1421.65   167550      0        0   0.050      70   0.00  0.00
25  1421.64 1421.66   167645      0        0   0.050      70   0.00  0.00

26  1421.66 1421.63   167359      0        0   0.050      70   0.00  0.00
27  1421.64 1421.66   167645      0        0   0.050      70   0.00  0.00
28  1421.66 1421.69   167929      0        0   0.050      70   0.00  0.00
29  1421.69 1421.69   167929      0        0   0.050      70   0.00  0.00
30  1421.69 1421.73   168309      0        0   0.050      70   0.00  0.00
31  1421.75 1421.74   168404      0        0   0.050      70   0.00  0.00

TOTAL                             0     2670   1.540    3265   0.15  0.25
AVERAGE  1421.73                  0       86             105 NORMAL= 0.87

MAXIMUM  1421.90      169925   DATE= 6    TOP CONSERVATION POOL   1421.60
MINIMUM  1421.62      167264   DATE=20    TOP FLOOD POOL          1429.00

WATER SUPPLY:  WITHDRAWN   1366 AC-FT

                      INFLOW VOLUME=     6476 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION