Mianus River Railroad Bridge

The Mianus River Railroad Bridge, also known as the Cos Cob Bridge, is a bascule bridge built in 1904 over the Mianus River, in Greenwich, Connecticut. It was listed on the National Register of Historic Places in 1987.[1] The bridge carries the Northeast Corridor, the busiest rail line in the United States, both in terms of ridership and service frequency.[2][3] It is operated by the Metro-North Railroad, successor to Conrail, Penn Central, and the New York, New Haven and Hartford Railroad, which erected it, and is owned by the Connecticut Department of Transportation.

Mianus River Railroad Bridge
Mianus River Bridge, Cos Cob (Fairfield County, Connecticut).jpg
Mianus River Railroad Bridge
Mianus River Railroad Bridge is located in Connecticut
Mianus River Railroad Bridge
Mianus River Railroad Bridge is located in the United States
Mianus River Railroad Bridge
LocationMetro-North Right-of-way at Mianus River, Greenwich, Connecticut
Coordinates41°1′51″N 73°35′41″W / 41.03083°N 73.59472°W / 41.03083; -73.59472Coordinates: 41°1′51″N 73°35′41″W / 41.03083°N 73.59472°W / 41.03083; -73.59472
Area1 acre (0.40 ha)
Built1904 (1904)
ArchitectAmerican Bridge Company
Architectural styleDeck Girder, Bascule
MPSMovable Railroad Bridges on the NE Corridor in Connecticut TR
NRHP reference No.87000845[1]
Added to NRHPJune 12, 1987

It is a rolling lift type moveable bridge, and was prefabricated by the American Bridge Company, to replace a previous unsafe bridge on the site. It has a total length of 1,059 feet (323 m), divided into 11 spans. Seven of these are deck truss spans, while the others are deck girder spans, all set on stone abutments. The main movable span is 107 feet (33 m) long; four of the truss spans are 120 feet (37 m) in length.[4]

Cos-Cob Bridge, Mianus River, looking west, ca. 1849

It is one of eight moveable bridges on the Northeast Corridor through Connecticut surveyed in one multiple property study in 1986.[5] The eight bridges from west to east are: this Mianus River Railroad Bridge, at Cos Cob, built in 1904; Norwalk River Railroad Bridge at South Norwalk, 1896; Saugatuck River Railroad Bridge at Westport, 1905; Pequonnock River Railroad Bridge at Bridgeport, 1902; Housatonic River Railroad Bridge, at Devon, 1905; Connecticut River Railroad Bridge, Old Saybrook-Old Lyme, 1907; Niantic River Bridge, East Lyme-Waterford, 1907; and Thames River Bridge (Amtrak), Groton, built in 1919. The Pequonnock River bridge—also on Metro-North's New Haven Line, as are the Norwalk, Westport, and Devon bridges—has since been replaced.

See alsoEdit


  1. ^ a b "National Register Information System". National Register of Historic Places. National Park Service. March 13, 2009.
  2. ^ "Amtrak Sets Ridership Record And Moves The Nation's Economy Forward - America's Railroad helps communities grow and prosper" (PDF) (Press release). Amtrak. October 14, 2013. Retrieved 2014-09-03.
  3. ^ "Transportation Statistics Annual Report" (PDF). Bureau of Transportation Statistics, U.S. Department of Transportation. November 2005. Retrieved 2007-02-18.
  4. ^ Anne Baggerman (August 10, 1977). "National Register of Historic Places Inventory-Nomination: Mianus River Railroad Bridge / Cos Cob Bridge". National Park Service. and Accompanying two photos, from 1986
  5. ^ Bruce Clouette, Matthew Roth and John Herzan (February 4, 1986). "Movable Railroad Bridges on the NE Corridor in Connecticut TR". National Park Service. Retrieved 2016-02-26.

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