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                                   Cheney Lake
                          MONTHLY LAKE REPORT
                                 MAY 06


    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 1421.59   166979
 1  1421.60 1421.59   166979      0        0   0.280     100   0.00  0.00
 2  1421.58 1421.60   167074      0        0   0.620     100   0.00  0.00
 3  1421.58 1421.59   166979      0        0   0.260     150   0.00  0.00
 4  1421.66 1421.76   168595      0        0   0.230     900   0.48  0.42
 5  1421.76 1421.76   168595      0        0   0.120     200   0.06  0.13

 6  1421.78 1421.79   168880      0        0   0.090     150   0.24  0.13
 7  1421.80 1421.83   169259      0        0   0.030     100   0.12  0.09
 8  1421.81 1421.78   168785      0        0   0.060      50   0.05  0.22
 9  1422.07 1422.17   172551      0        0   0.200    2000   1.84  1.00
10  1422.25 1422.30   173833      0        0   0.310    1000   0.07  0.07

11  1422.33 1422.27   173537      0      236   0.230     500   0.10  0.02
12  1422.25 1422.15   172354      0      655   0.260     200   0.00  0.00
13  1422.12 1422.03   171171      0      736   0.210     150   0.00  0.00
14  1421.98 1421.89   169830      0      735   0.300     100   0.00  0.00
15  1421.87 1421.72   168214      0      734   0.350      80   0.00  0.00

16  1421.71 1421.68   167835      0      336   0.230      70   0.00  0.00
17  1421.69 1421.66   167645      0        0   0.290      60   0.00  0.00
18  1421.67 1421.65   167550      0        0   0.290      50   0.00  0.00
19  1421.65 1421.66   167645      0        0   0.310      50   0.00  0.00
20  1421.64 1421.63   167359      0        0   0.340      50   0.00  0.00

21  1421.64 1421.63   167359      0        0   0.310      50   0.00  0.01
22  1421.66 1421.61   167169      0        0   0.230      50   0.08  0.42
23  1421.62 1421.62   167264      0        0   0.280     200   0.02  0.04
24  1421.62 1421.62   167264      0        0   0.400     150   0.06  0.04
25  1421.61 1421.61   167169      0        0   0.320     150   0.00  0.00

26  1421.68 1421.60   167074      0        0   0.410     100   0.12  0.20
27  1421.57 1421.53   166409      0        0   0.480      50   0.00  0.03
28  1421.52 1421.52   166314      0        0   0.440      30   0.00  0.00
29  1421.52 1421.61   167169      0        0   0.430     500   0.00  0.00
30  1421.57 1421.58   166884      0        0   0.720     250   1.51  0.22
31  1421.58 1421.61   167169      0        0   0.220     200   0.13  0.17

TOTAL                             0     3433   9.250    7790   4.88  3.21
AVERAGE  1421.74                  0      111             251 NORMAL= 3.91

MAXIMUM  1422.37      174523   DATE=11    TOP CONSERVATION POOL   1421.60
MINIMUM  1421.50      166124   DATE=28    TOP FLOOD POOL          1429.00

WATER SUPPLY:  WITHDRAWN   3250 AC-FT

                      INFLOW VOLUME=    15451 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION