Design: Bridges

Maps

Google Map with Points on Historical Layout

Resources

Bridge Nomenclature
Massachusetts Bridges
New Hampshire Moveable Bridges
New Hampshire Railroads – History, Stations, Bridges, …

Notes

Where photos of the original bridge are not known, use a bridge of similar type. Basic types are Thru Truss, Deck Truss, Deck plate Girder, and Thru Plate Girder. Sometimes the layout has two tracks where the prototype is one track. Either widen the bridge to include two tracks, or add a separate second bridge as a Deck Plate Girder bridge.

Boston

Layout:

  • Longfellow Bridge 1906, trolley bridge
  • Draw One Bridge 1935, 2 railroad draw bridges with 2 tracks each

Longfellow Bridge, Charles River, 1906, 105 x 1767.5 ft.

Charles River Bridge, Draw One Bridge, 1935-, Bascule Thru Truss

Portsmouth

Dover

Layout:

  • Cocheco River Bridge, prototype 1 track, layout 2 tracks, Deck Truss Bridge

Cocheco River Bridge, Dover

Dover Point Bridge 1865 – 1934 Replaced by Little Bay Bridge / General Sullivan Bridge

B&M Railroad Arch Bridge

https://www.dover.nh.gov/Assets/government/city-operations/library/image/Historical-Images/Bridges-and-Dams/B%20&%20M%20arch.jpg

Rochester

Layout:

  • North Main Street Bridge, Trolley/Road bridge, Stone Arch Bridge
  • East Rochester Railroad Bridge, 2 tracks, Thru Truss Bridge

North Main Street Bridge, Cocheco River, 1883, 50 x 133 ft., Trolley + Road

Cocheco River Bridge, East Rochester

Wakefield/Sanbornville

Wolfeboro – Wolfeboro Falls

Layout:

  • Main Street Bridge, Stone Arch Bridge
  • Smith River Bridge, Deck Plate Girder Bridge
  • Smith River Railroad Bridge, at Berry Mill Dam, 2 tracks
  • Back Bay Causeway, railroad
  • Lake Wentworth Causeway, railroad

Back Bay Causeway (Similar to Crescent Lake Causeway)

Crescent Lake Causeway

Lake Wentworth Causeway (Similar to Crescent Lake Causeway, with tiny Lake Wentworth Station built over water(?), only accessible by boat or train).

Main Street Bridge, Stone Arch Bridge

Smith River Bridge, Center Street

Ossipee

Layout:

  • Whittier Covered Bridge, covered highway bridge, Bearcamp River
  • Bearcamp River Railway Bridge, 146 ft., open deck, thru truss

Whittier Covered Bridge, 1870, 20.5 x 132.5 Ft.

Bearcamp River Railway Bridge, 146 ft., open deck, thru truss

North Conway

Conway Brand Railroad Line

Layout:

  • Saco River Covered Bridge, highway
  • Saco River Railroad Bridge, prototype 1 track, layout 2 tracks, Thru Truss
  • Railroad Bridge

Saco River Bridge, 1890, 30 ft. x 224 ft.

Saco River Railroad Bridge, 1906, Thru Warren Truss

Truss Nomenclature

Through Girder Bridge

Deck Plate Girder Bridge

Stone Arch Bridge

Pile Trestle

Frankenstein Trestle