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                                  Big Hill 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  858.39    27439
 1   858.38  858.43    27487      0       29   0.280      55   0.00  0.06
 2   858.59  858.87    28017      0       82   0.050     350   0.51  0.54
 3   858.98  859.52    28814      0      212   0.080     620   0.05  0.63
 4   859.47  859.26    28494      0      293   0.120     140   1.20  1.07
 5   859.17  859.02    28199      0      197   0.200      60   0.00  0.00

 6   858.95  858.87    28017      0      132   0.230      40   0.00  0.03
 7   860.98  862.18    32183      0      771   0.220    2880   2.84  2.22
 8   861.87  860.86    30485      0      886   0.100      30   0.36  0.39
 9   860.59  860.10    29530      0      656   0.140     190   0.07  0.16
10   859.91  859.71    29047      0      453   0.240     210   0.11  0.14

11   859.61  859.36    28617      0      340   0.130     140   1.56  0.67
12   859.27  859.07    28260      0      226   0.290      60   0.05  0.02
13   858.99  858.85    27993      0      140   0.370      20   0.00  0.00
14   858.79  858.68    27788      0       92   0.440       5   0.00  0.00
15   858.64  858.57    27656      0       66   0.460       1   0.00  0.00

16   858.54  858.47    27535      0       45   0.120       0   0.15  0.23
17   858.45  858.39    27439      0       33   0.320       0   0.00  0.00
18   858.38  858.32    27355      0       26   0.300       0   0.00  0.00
19   858.30  858.27    27294      0       20   0.390       0   0.00  0.00
20   858.25  858.22    27234      0       16   0.430       0   0.00  0.00

21   858.21  858.19    27198      0       13   0.420       0   0.00  0.00
22   858.19  858.17    27174      0       12   0.460      10   0.05  0.04
23   858.16  858.14    27138      0       10   0.320      10   0.00  0.00
24   858.13  858.18    27186      0       11   0.380      10   0.00  0.09
25   858.17  858.16    27162      0       11   0.050      30   0.50  0.38

26   858.15  858.13    27126      0       10   0.110      10   0.00  0.01
27   858.14  858.16    27162      0       10   0.190      10   0.00  0.04
28   858.18  858.18    27186      0       12   0.080      40   0.26  0.27
29   858.18  858.16    27162      0       12   0.240      10   0.03  0.02
30   858.16  858.18    27186      0       11   0.230      30   0.02  0.10
31   858.19  858.19    27198      0       13   0.160      30   0.20  0.31

TOTAL                             0     4839   7.550    4991   7.96  7.42
AVERAGE   858.80                  0      156             161 NORMAL= 5.30

MAXIMUM   862.18       32183   DATE= 7    TOP CONSERVATION POOL    858.00
MINIMUM   858.13       27126   DATE=26    TOP FLOOD POOL           867.50

                      INFLOW VOLUME=     9899 AC-FT



REPORT IS SUBJECT TO CHANGE AND/OR REVISION