| 词条 | Thomson Road–Air Line Railroad Bridge |
| 释义 |
| name = Thomson Road–Air Line Railroad Bridge | nrhp_type = | image = Thomson Road-Air Line Railroad Bridge.jpg | caption = | location= Thomson Rd. over abandoned RR right-of-way, Howard Township, Michigan | coordinates = {{coord|41|52|53|N|86|11|41|W|display=inline,title}} | locmapin = Michigan#USA | built = {{Start date|1919}} | architect OR builder = | architecture = concrete T-beam | added = December 22, 1999 | area = less than one acre | governing_body = Local | mpsub = {{NRHP url|id=64500271|title=Highway Bridges of Michigan MPS}} | refnum = 99001612[1] }} The Thomson Road–Air Line Railroad Bridge, also known as just the Thomson Road Bridge, is a bridge located on Thomson Road over the abandoned Michigan Air Line Railroad right-of-way in Howard Township, Michigan. It was listed on the National Register of Historic Places in 1999.[1] It is one of the oldest examples of a concrete T-beam bridge in Michigan, and has a rare brick deck. HistoryThe main line of the Michigan Central Railroad, located about {{convert|.5|mile}} west of this site, was constructed through Cass County in 1848.[2] Just after the Civil War, a new rail line known as the Michigan Air Line Railroad was constructed, linking Jackson with the Michigan Central line at Niles; two years later, the route was controlled by the Michigan Central. In 1919, a cutoff was constructed through Howard Township, linking the main Michigan Central line to the Airline. This bridge was constructed at the same time, probably from a design developed by the railroad company. The railroad beneath the bridge has been abandoned for many years and is overgrown.[2] DescriptionThe Thomson Road–Air Line Railroad Bridge is one of the oldest examples of a concrete T-beam bridge in Michigan, and the only historically significant bridge of the type having multiple spans.[2] The entire bridge is {{convert|169|ft}} long and just over {{convert|20|ft}} in width, with five spans of {{convert|35|ft}} in length. The length of the structure is due to the wide right-of-way beneath, which was used as a railroad switchyard known as the "Hump." The bridge has an unusual brick deck,[3] which has a slight arch.[2] The original bridge railings are metal pipe panels strung between concrete posts. The bridge has maintained an excellent integrity. References1. ^1 {{NRISref|version=2010a}} 2. ^1 2 3 {{cite web |url=http://www.mcgi.state.mi.us/hso/sites/1742.htm |title= Thompson Road/Air Line Railroad Bridge |publisher= Michigan State Housing Development Authority: Historic Sites Online|accessdate= December 29, 2013}} 3. ^{{cite web | title = Thomson Road Bridge | publisher = HistoricBridges.org| url = http://www.historicbridges.org/bridges/browser/?bridgebrowser=concrete/thomson/}} External links
6 : Road bridges on the National Register of Historic Places in Michigan|Bridges completed in 1919|National Register of Historic Places in Cass County, Michigan|Road bridges in Michigan|Concrete bridges in the United States|Buildings and structures in Cass County, Michigan |
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