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                                   Cheney Lake
                          MONTHLY LAKE REPORT
                                 MAY 09


    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 1424.21   193183
 1  1424.39 1424.59   197211      0        0   0.180    2150   1.17  0.21
 2  1424.63 1424.76   199013      0        0   0.220    1000   0.22  0.03
 3  1424.82 1424.91   200603      0        0   0.120     900   0.26  0.26
 4  1424.93 1424.90   200497      0      503   0.160     500   0.02  0.00
 5  1424.89 1424.87   200179      0     1005   0.120     900   0.00  0.00

 6  1424.84 1424.80   199438      0     1005   0.020     770   0.21  0.22
 7  1424.77 1424.72   198589      0     1004   0.220     770   0.00  0.00
 8  1424.84 1425.58   207928      0      471   0.460    5350   0.94  1.66
 9  1425.88 1426.08   213453      0      507   0.430    3400   0.00  0.00
10  1426.12 1426.14   214137      0     1017   0.140    1450   0.00  0.00

11  1426.14 1426.12   213909      0     1017   0.090    1000   0.00  0.01
12  1426.07 1426.03   212885      0     1017   0.200     800   0.00  0.00
13  1426.02 1426.01   212657      0     1016   0.030     700   0.00  0.01
14  1425.97 1425.88   211225      0     1016   0.400     650   0.00  0.00
15  1425.83 1425.79   210236      0     1014   0.270     600   0.00  0.00

16  1425.75 1425.61   208258      0     1013   0.300     500   0.08  0.20
17  1425.60 1425.49   206940      0     1012   0.230     400   0.00  0.00
18  1425.45 1425.29   204743      0     1157   0.370     350   0.00  0.00
19  1425.21 1425.09   202545      0     1264   0.370     300   0.00  0.00
20  1425.00 1424.85   199967      0     1261   0.390     250   0.00  0.00

21  1424.81 1424.68   198166      0     1259   0.380     250   0.00  0.00
22  1424.62 1424.46   195833      0     1257   0.320     250   0.00  0.00
23  1424.40 1424.25   193608      0     1254   0.210     250   0.00  0.00
24  1424.18 1424.07   191699      0     1091   0.300     200   0.00  0.00
25  1424.03 1423.90   189936      0      997   0.300     200   0.00  0.00

26  1423.84 1423.78   188709      0      995   0.250     300   0.01  0.20
27  1423.71 1423.57   186561      0      994   0.260     260   0.18  0.14
28  1423.52 1423.34   184210      0     1159   0.090     250   0.00  0.00
29  1423.30 1423.13   182063      0     1241   0.250     240   0.00  0.00
30  1423.06 1422.90   179748      0     1238   0.410     230   0.00  0.00
31  1422.81 1422.65   177284      0     1235   0.410     210   0.00  0.07

TOTAL                             0    29020   7.900   25380   3.09  3.01
AVERAGE  1424.78                  0      936             819 NORMAL= 3.91

MAXIMUM  1426.14      214137   DATE=11    TOP CONSERVATION POOL   1421.60
MINIMUM  1422.65      177284   DATE=31    TOP FLOOD POOL          1429.00

WATER SUPPLY:  WITHDRAWN   3551 AC-FT

                      INFLOW VOLUME=    50340 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION