New London Ledge Lighthouse, Connecticut
A timber crib 52 feet square and 31 feet high was constructed of yellow pine at nearby Groton, Connecticut. On August 18, 1908 the crib was towed out to Southwest Ledge Shoal and filled with concrete, gravel and riprap to sink it in 28 feet of water to serve as the foundation for the lighthouse. The crib was capped with a 3 foot layer of concrete.
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