• Basic Bridges: Introductory information about bridge truss types and terminology.

• Bridge Hunter:  A database of historic or notable bridges in the United States, past and present.

• BridgeMapper: This  website provides historic bridge information for structures throughout the country. Webmaster, Todd Wilson.

• Bridges of Metropolitan Cleveland: Compiled in 1981 to chronicle the history of Cleveland’s many bridges.

• Covered Spans of Yesteryear: Documents North America’s lost covered bridges.

• Historic American Engineering Record:  Online presentation of the HAER collections includes engineering drawings,  photographs and data pages with written histories.

• Historic Bridges of Michigan and Elsewhere: Nathan Holth’s excellent website is a major source of information about metal truss bridges. Be sure to check out “An Introduction to Historic Truss Bridges“. Nathan has made numerous contributions to this website.

• Historic and Cultural Resource Preservation Site: a directory of historic preservation websites.

• Historic Bridges of the U.S.:  A great website with coverage of select bridges of all types throughout the U.S.

• “Introductory Guide to Covered Bridges“ prepared by the National Society for the Preservation of Covered Bridges, Inc., click on the link.

• National Bridge Inventory The NBI is an online searchable database compiled from the state bridge inventories. It enables easy searching for technical specifications of public bridges. Caution: since the Ohio Bridge Inventory on which the NBI is based substantially overstates the number of remaining historic truss bridges use this website (not the NBI) as the benchmark for determining the existence of old truss bridges. The 2007 Ohio Bridge Inventory also erroneously identifies most pony truss bridges as through trusses.

• National Society for the Preservation of Covered Bridges  This country’s remaining Covered Bridges are a National Treasure! Even in their sometimes dilapidated or poorly restored condition, these spans bear truthful witness to much that is American Culture and Heritage, and ought thus to be preserved!  The National Society for the Preservation of Covered Bridges, founded in 1950, has been instrumental in saving many historic spans from demolition.

                                                                                                                                                 

• Spans Of Time: A remarkable report on Oklahoma’s historic bridges that has lots of information about all types of metal truss bridges.

• Theodore Burr Covered Bridge Society of Pennsylvania promotes interest and active participation in the preservation and restoration of the remaining historic covered bridges in the Commonwealth of Pennsylvania.

Bibliographies