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Clear Lake Winter Levels

The Gopcevic Decree required the development of an operation schedule for the Cache Creek Dam on Cache Creek. Yolo County Flood Control and Water Conservation District must operate the Cache Creek Dam in accordance with the schedule. The Operation Schedule identifies lake levels for different times during the winter to which Clear Lake is allowed to fill. Selected dates and corresponding lake levels are:

Prior to January 8 5.50 Rumsey
January 16 5.96 Rumsey
January 19 6.08 Rumsey
January 24 6.27 Rumsey
February 14 7.10 Rumsey
March 15 7.56 Rumsey

When the actual lake level is below the level indicated in the schedule, no water is allowed to be released at the dam. Should the actual lake level rise above the level indicated in the schedule, the gates in the dam must be opened to lower the lake level. As the actual lake level approaches the level indicated in the schedule for that date, conditions are taken into account so that the dam operation will minimize flooding, while allowing the lake to fill to 7.56 Rumsey. There are two exceptions. When the lake is filling rapidly, water may be released from the dam when the actual lake level is within one-half foot below the level indicated in the schedule. When the lake is falling and no rain is anticipated, the dam may be closed when the actual lake level is within one-half foot above the level indicated in the schedule.


GOPCEVIC DECREE
OPERATION SCEDULE FOR FILLING CLEAR LAKE

MONTH DAY STAGE   MONTH DAY STAGE
January 8 5.50 February 11 6.98
January 9 5.56 February 12 7.02
January 10 5.62 February 13 7.06
January 11 5.68 February 14 7.10
January 12 5.74 February 15 7.12
January 13 5.80 February 16 7.13
January 14 5.86 February 17 7.15
January 15 5.92 February 18 7.16
January 16 5.96 February 19 7.18
January 17 6.00 February 20 7.20
January 18 6.04 February 21 7.21
January 19 6.08 February 22 7.23
January 20 6.12 February 23 7.24
January 21 6.16 February 24 7.26
January 22 6.20 February 25 7.27
January 23 6.23 February 26 7.29
January 24 6.27 February 27 7.31
January 25 6.31 February 28 7.32
January 26 6.35 March 1 7.34
January 27 6.39 March 2 7.35
January 28 6.43 March 3 7.37
January 29 6.47 March 4 7.39
January 30 6.51 March 5 7.40
January 31 6.55 March 6 7.42
February 1 6.59 March 7 7.43
February 2 6.63 March 8 7.45
February 3 6.67 March 9 7.46
February 4 6.71 March 10 7.48
February 5 6.75 March 11 7.50
February 6 6.79 March 12 7.51
February 7 6.82 March 13 7.53
February 8 6.86 March 14 7.54
February 9 6.90 March 15 7.56
February 10 6.94      

Releases may take place when the lake level rises above the scedule.

Exception No. 1:
When the lake level is a few tenths, not more than five, below the schedule, and rains occur of sufficient intensity to indicate a sharp rise in the lake level, then such a rise should be anticipated and the gates opened.

Exception No. 2:
When the lake level is a few tenths, not more than five, above the scedule, and it appears that under to conditions existing at the time, the lake level will join the schedule elevation in a few days, then the gates should be closed.