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Clear Lake is California's largest fresh water lake.  It is 1,318.26' above sea level.  This elevation is known as "zero Rumsey".  The level of the lake for flood purposes is measured by how high it is above 0 Rumsey.  Clear Lake is considered "full" when it reaches 7.56' on The Rumsey Gage.
Clearlake-Oaks.com
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