Overseas Highway
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The Overseas Highway is a 127.5-mile (205.2 km) long road carrying U.S. Route 1 through the Florida Keys. Large parts of it were built on the former right-of-way of the Overseas Railroad, the Key West Extension of the Florida East Coast Railway. Completed in 1912, the Overseas Railroad was heavily damaged and partially destroyed in the Labor Day Hurricane of 1935. The Florida East Coast Railway was financially unable to rebuild the destroyed sections, so the roadbed and remaining bridges were sold to the State of Florida for $640,000.[2]
The original construction of the Overseas Highway used many of the bridges of the former railroad, including truss bridges, where the roadway was built on top of the trusses. Most of these older bridges built for railroads have been replaced by more modern bridges that are able to accommodate more than two lanes of traffic. The highway included the Seven Mile Bridge, the Bahia Honda Bridge and the Long Key Bridge (although these three original bridges are no longer open to vehicular traffic, except for part of Seven Mile Bridge, they are listed on the National Register of Historic Places and are currently used as fishing piers).
From its opening on March 29, 1938, until the destruction by fire of the Card Sound Bridge in 1944, the Overseas Highway also had the signed designation State Road 4A; after the realignment in 1945 to its current entry onto Key Largo along the old railroad right-of-way (the new segment of Overseas Highway, from Florida City to Key Largo is known locally as "the 18 Mile Stretch"), it received the unsigned designation State Road 5, the same as the entirety of US 1 south of Jacksonville at that time.
Portions of the road were tolled until April 15, 1954; toll booths were located on Big Pine Key and Lower Matecumbe Key. Pigeon Key, roughly the midway point of the Seven Mile Bridge, served as the headquarters for the "Overseas Road and Toll District."[3] The toll for automobiles was $1, plus 25 cents per passenger.[4]
The entire roadway of the Overseas Highway was substantially rebuilt in the 1980s. In recent years, Pigeon Key was used by the University of Miami as an oceanography laboratory, but current efforts to restore the buildings on the island have resulted in the establishment of a railroad museum there. The newer Seven Mile Bridge does not have direct access to Pigeon Key; people going there must walk on 2.2 miles (3.5 km) of the original Seven Mile Bridge from its northern end on Knight's Key, or take a shuttle bus, to reach the island.
Mile Markers
Locations along the Overseas Highway from Key West to Key Largo are commonly given as "Mile Markers". The Florida Department of Transportation maintains mile marker signs every mile along the highway. Numbering starts in Key West, and increases towards the East and Northeast up the path of the highway over the keys. Businesses along the highway began listing their locations by "Mile Markers", adding decimal parts to more precisely indicate locations between mile marker signs. Outside of Key West and the City of Marathon, street addresses along the highway are based on the "Mile Markers", using a four to six digit number (with no decimal point), so that a building between Mile Markers 88 and 89 might have an address of 88650.[5]
Trail
In 2001, the Monroe County commission, the Florida Department of Environmental Protection's Office of Greenways and Trails, and the Florida Department of Transportation entered into a Memorandum of understanding to create the Florida Keys Overseas Heritage Trail.[6] The trail will be a world-class, multi-use bicycle and pedestrian facility that will traverse the Florida Keys from Key Largo to Key West. Upon completion, the FKOHT will include an integrated system of educational kiosks, roadside picnic areas, scenic overlooks, fishing piers, water access points, and bicycle and jogging paths. The development of the trail will provide a mechanism for the preservation and use of the historic Flagler Railroad Bridges, 23 of which still exist and are mostly intact. Several alternatives exist for trail alignment, including cutting down the 22-foot (6.7 m) wide 1940's era roadway to its original 12-foot (3.7 m) spandrel width, or using the 22-foot (6.7 m) wide roadway as is, particularly in multi-use areas. In all cases, original bridgework will be repaired or rebuilt, and the breaks created during the 1980s fishing pier conversion will be reconnected. Where the original roadway no longer exists, the trail will be temporarily cantilevered on the side of the current US 1 highway bridge, until new 12-foot (3.7 m) wide trail bridge sections can be built. The new sections will be built to match the historical character of the original bridges.
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