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                                     Cheney Lake
                          MONTHLY LAKE REPORT
                                 MAY 07


    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 1421.81   169070
 1  1421.80 1421.84   169354      0      129   0.230     300   0.00  0.00
 2  1421.87 1421.86   169545      0      129   0.030     250   0.37  0.43
 3  1421.86 1421.88   169735      0      129   0.060     200   0.01  0.07
 4  1421.85 1421.83   169259      0      129   0.060      50   0.00  0.01
 5  1421.84 1421.77   168690      0      129   0.090      20   0.00  0.13

 6  1421.93 1422.84   179156      0      130   0.130    5450   0.95  0.80
 7  1423.20 1423.79   188811      0       52   0.000    5000   4.78  1.67
 8  1424.03 1424.28   193926      0        0   0.050    2650   0.05  0.00
 9  1424.34 1424.45   195727      0        0   0.160    1000   0.00  0.05
10  1424.49 1424.58   197105      0        0   0.170     800   0.00  0.00

11  1424.62 1424.64   197742      0      199   0.180     660   0.29  0.41
12  1424.64 1424.57   196999      0      668   0.280     440   0.00  0.00
13  1424.55 1424.46   195833      0      754   0.260     330   0.00  0.00
14  1424.43 1424.35   194667      0      753   0.350     370   0.00  0.00
15  1424.47 1424.34   194561      0      753   0.450     830   0.40  0.66

16  1424.32 1424.23   193396      0      752   0.240     280   0.00  0.03
17  1424.18 1424.09   191912      0      751   0.210     250   0.00  0.00
18  1424.03 1423.97   190651      0      750   0.280     150   0.00  0.00
19  1423.91 1423.82   189117      0      749   0.300     110   0.00  0.00
20  1423.77 1423.67   187585      0      748   0.270     140   0.00  0.00

21  1423.63 1423.47   185539      0      885   0.330      90   0.00  0.00
22  1423.45 1423.28   183597      0      991   0.280      60   0.00  0.00
23  1423.26 1423.09   181654      0      989   0.250     120   0.05  0.49
24  1423.36 1424.18   192866      0      671   0.170    6350   0.22  2.44
25  1424.41 1424.67   198060      0        0   0.020    2700   0.01  0.00

26  1424.73 1424.92   200710      0        0   0.050    1450   0.00  0.00
27  1424.98 1425.09   202545      0        0   0.150    1050   0.05  0.20
28  1425.14 1425.19   203644      0        0   0.200     650   0.06  0.01
29  1425.23 1425.15   203205      0      523   0.220     430   0.02  0.00
30  1425.11 1425.04   201997      0     1008   0.220     530   0.38  0.47
31  1425.02 1424.87   200179      0     1006   0.220     290   0.04  0.01

TOTAL                             0    13777   5.910   33000   7.68  7.88
AVERAGE  1423.88                  0      444            1065 NORMAL= 3.91

MAXIMUM  1425.23      204084   DATE=29    TOP CONSERVATION POOL   1421.60
MINIMUM  1421.77      168690   DATE= 5    TOP FLOOD POOL          1429.00

WATER SUPPLY:  WITHDRAWN   3247 AC-FT

                      INFLOW VOLUME=    65455 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION