Converted to an artificial reef

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Flagler Memorial Bridge (Old) (Palm Beach County, Florida)
Built 1938 ; 2016
Deckplate girder bascule bridge over Intracoastal Waterway on FL A1A in Palm Beach
Replaced by a new bridge

Hathaway Bridge (Bay County, Florida)
Built in 1945 ; replaced by the 1960 St. Andrews Bay Bridge
Lost Through truss bridge over St. Andrews Bay on US 98 a truss span was moved and Submerged in the Gulf Used as an Artifical Reef at N 30° 02.676 W 085° 43.752
Replaced by new bridge and at least 1 span section was moved and submerged into the Gulf as an Artifical Reef

Old East Bay Bridge (Bay County, Florida)
Built 1927; All spans removed 2008; 3 spans sunk to become an artificial reef
Parker through truss bridge over East Bay on Oakshore Drive (old alignment of US 98)
Removed

Overseas Highway - Seven Mile Bridge (Monroe County, Florida)
Originally built by the railroad in 1912. Replaced and swing span removed 1982; Part of the bridge now used for fishing.
Concrete Arch and Deck Girder bridge over Moser Channel on Old US 1 with a through truss swing span (removed), now used as a Fishing Pier and observation deck in Marathon


Pine Island Road Bridge (Old) (Lee County, Florida)
Built 1968 replaced with new single leaf bascule
Bascule bridge over Matlacha Pass on Pine Island Road in Cape Coral
Replaced by a new bridge

Ponquogue Bridge (Old) (Suffolk County, New York)
Built 1930; Replaced 1986 with main span being dumped at the Shinnecock artificial reef and the approaches being reused as fishing piers; Section of fishing pier damaged by Hurricane Sandy 2012; Aforementioned section removed 2013
Lost Bridge over Shinnecock Bay on Lighthouse Road
Replaced by a new bridge

Tappan Zee Bridge (Rockland County, New York)
Opened to traffic December 15, 1955. Closed to traffic on October 12, 2017
Lost Cantilevered through truss bridge over Hudson River on I-87/I-287/New York State Thruway in South Nyack
Demolished 2018/2019, Bridge was taken apart and may be reused: See: http://www.wellsvilledaily.com/news/20171207/parts-of-tappan-zee-bridge-to-be-repurposed-in-allegany-county