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On California Ave., it was the water tower for the old Libby's cannery, which legend says, is where fruit cocktail was invented. The tower is probably about 150 up in the air, with the 'can' about 25 feet tall, 15 feet across.
When the cannery was torn down, the water tower was spared. The city named it a local historical landmark. I've been told the Federal Aviation Administration also stressed the importance of the landmark, citing its use as a navigational landmark. Libby's is gone but the can is painted like their original fruit cocktail can.