Rocky Neck State Park in East Lyme, Connecticut, combines a Long Island Sound beach, tidal river, salt marsh, and notable Depression-era architecture within a 710-acre public recreation area. The land had been used for fertilizer operations in the 19th century before conservationists acquired it in 1931 and the state developed it into a park with help from federal relief workers during the Great Depression. Its most prominent structure, the Ellie Mitchell Pavilion, was completed in 1936 by the Works Progress Administration and later listed on the National Register of Historic Places. A 1934 railroad footbridge and the park’s beach, campground, trails, and marshes remain central features.