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The bay is very, very shallow[1]. Off hand, the average depth is less than 7 feet. Most of the depth is around the golden gate itself.

Around the king tides, an island forms just off of Ashby Ave, in Berkeley.

[1] http://makerandmoss.com/wp-content/uploads/2013/04/81ackqtij...

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You're not wrong about the bay being mostly shallow. To clarify though, the bay's average depth in the southern and northern areas is closer to 15-17 ft and near the Golden Gate Bridge and Treasure Island area is closer to 40ft[1]. Maybe the median depth is closer to 7 feet.

[1] http://omp.gso.uri.edu/ompweb/doee/science/descript/baysfran...

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