BM - Sulphite Railroad Covered Bridge 29-07-09
The existing structure replaced a framed trestle bridge erected here in 1891 or 1892 by the Franklin and Tilton Railroad. This unusual bridge, built by the Bridge and Building Department of the Boston and Maine Railroad in 1896, appears to be the only deck-covered railroad bridge left in the United States. It was named Sulphite because of the large amounts of sulfur transported over the rail lines for use by the giant pulp and paper mills not far from the bridge. It is also known as the Upside Down Covered Bridge because the railroad track crosses over the top of the structure rather than running through its center. Service over the line was suspended in 1973. The bridge sides are boarded over with 7/8" siding and the ends are closed. There was a fire inside the bridge on October 27, 1980 that is believed to have been arson. Replacement costs could run as high as $500,000. The Sulphite Bridge is listed on the National Register of Historic Places.
- Pratt deck truss bridge over Winnipesautee River on Former Boston & Maine Railroad (Franklin & Tilton Railroad)
- Franklin, Merrimack County, New Hampshire
- Closed to all traffic
- Future prospects
- To be fixed and preserved
- Built 1896 as Covered Pratt Deck Truss, Abandoned 1976, Outer wood burned off by vandals in 1980
- - Boston & Maine Railroad (BM)
- Franklin & Tilton Railroad
- Covered Wooden Pratt Deck Truss
Length of largest span: 65.0 ft.
Total length: 225.0 ft.
Posted to the National Register of Historic Places on June 11, 1975
- Also called
- BM - Upside-Down Covered Bridge
BM - Winnipesautee River Bridge
Upside-Down Covered Bridge
Sulphite Covered Bridge
- Approximate latitude, longitude
- +43.44490, -71.63524 (decimal degrees)
43°26'42" N, 71°38'07" W (degrees°minutes'seconds")
- Approximate UTM coordinates
- 19/286757/4813595 (zone/easting/northing)
- Quadrangle map:
- Inventory numbers
- NRHP 75000130 (National Register of Historic Places reference number)
BH 50592 (Bridgehunter.com ID)
- January 24, 2021: New photos from Josh Schmid
- December 26, 2015: New photos from Mike Garland
- June 11, 2015: New photos from Royce and Bobette Haley
- May 17, 2015: Updated by Luke: Name change via Royce's forum post.
- February 14, 2014: Added by Jack Schmidt
- January 26, 2014: New photo from Luke Harden
- August 10, 2012: Updated by Daniel Hopkins: Added category "Railroad"
- December 18, 2011: Updated by J.P.: Added category "Boston & Maine Railroad"
- December 18, 2011: Photos imported by James Baughn
- J.P. - wildcatjon2000 [at] gmail [dot] com
- HAER NH-36 - Sulphite Railroad Bridge, Former Boston & Maine Railroad (originally Tilton & Franklin Railroad) spanning Winnipesautee River, Franklin, Merrimack County, NH
- Jack Schmidt - jjturtle [at] earthlink [dot] net
- Royce and Bobette Haley - roycehaley111 [at] yahoo [dot] com
- Mike Garland - Rapier342 [at] comcast [dot] net
- Josh Schmid