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                                   Cheney Lake
                          MONTHLY LAKE REPORT
                                 MAY 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 1421.75   168500
 1  1421.74 1421.68   167835      0      244   0.070     200   0.36  0.33
 2  1421.66 1421.62   167264      0      244   0.220     150   0.00  0.00
 3  1421.61 1421.59   166979      0       94   0.260     100   0.00  0.00
 4  1421.60 1421.60   167074      0        0   0.270      90   0.00  0.00
 5  1421.59 1421.58   166884      0        0   0.180      80   0.00  0.00

 6  1421.58 1421.58   166884      0        0   0.340      70   0.00  0.00
 7  1421.58 1421.57   166789      0        0   0.390      65   0.00  0.00
 8  1421.57 1421.55   166600      0        0   0.150      65   0.00  0.00
 9  1421.58 1421.55   166600      0        0   0.480      65   0.00  0.00
10  1421.54 1421.53   166409      0        0   0.280      65   0.00  0.00

11  1421.54 1421.54   166504      0        0   0.160      65   0.00  0.00
12  1421.50 1421.57   166789      0        0   0.160     350   0.00  0.00
13  1421.67 1421.89   169830      0        0   0.580    1600   1.42  1.05
14  1421.93 1421.97   170590      0        0   0.060     500   0.06  0.04
15  1421.97 1422.00   170875      0        0   0.150     350   0.00  0.00

16  1421.99 1422.01   170974      0        0   0.270     270   0.00  0.00
17  1421.99 1421.97   170590      0      163   0.270     230   0.00  0.56
18  1421.98 1421.96   170495      0      245   0.380     200   0.00  0.00
19  1421.95 1421.90   169925      0      245   0.540     170   0.00  0.00
20  1421.92 1421.88   169735      0      245   0.370     150   0.00  0.00

21  1421.86 1421.80   168975      0      244   0.480     130   0.00  0.00
22  1421.78 1421.73   168309      0      244   0.520     110   0.00  0.00
23  1421.76 1421.67   167740      0      244   0.490     100   0.00  0.00
24  1421.67 1421.69   167929      0      244   0.300      90   0.00  0.00
25  1421.63 1421.57   166789      0      132   0.470      80   0.00  0.00

26  1421.57 1421.54   166504      0        0   0.250      75   0.00  0.00
27  1421.56 1421.54   166504      0        0   0.180      70   0.00  0.00
28  1421.55 1421.51   166219      0        0   0.310      65   0.00  0.00
29  1421.51 1421.43   165459      0        0   0.470      65   0.00  0.00
30  1421.53 1421.47   165839      0        0   0.480      65   0.00  0.08
31  1421.46 1421.43   165459      0        0   0.480      65   0.00  0.00

TOTAL                             0     2588   10.010    5750   1.84  2.06
AVERAGE  1421.67                  0       83             185 NORMAL= 3.91

MAXIMUM  1422.01      170974   DATE=17    TOP CONSERVATION POOL   1421.60
MINIMUM  1421.43      165459   DATE=31    TOP FLOOD POOL          1429.00

WATER SUPPLY:  WITHDRAWN   3514 AC-FT

                      INFLOW VOLUME=    11405 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION