| 词条 | US 31–Pentwater River Bridge |
| 释义 |
| bridge_name = US 31–Pentwater River Bridge | native_name = | native_name_lang = | image = | image_size = | alt = | caption = | official_name = | other_name = | carries = Oceana Drive | crosses = | locale = | owner = | maint = | id = | website = | architect = | designer = | engineering = | design = | material = | length = {{convert|270|ft|m}} | width = {{convert|63.1|ft|m}} | height = | mainspan = {{convert|102|ft|m}} | spans = 3 | pierswater = | load = | clearance = | below = | life = | builder = | fabricator = | begin = | complete = | cost = $266,564 | open = | inaugurated = | toll = | traffic = | preceded = | followed = | heritage = | collapsed = | closed = | replaces = | map_cue = | map_image = | map_alt = | map_text = | map_width = | coordinates = {{coord|43.7075|-86.3559|region:US-MI_type:landmark|display=inline,title}} | lat = | long = | references = [1] | extra ={{Infobox NRHP |embed=yes | name = US 31–Pentwater River Bridge | nrhp_type = | image = | caption = | location= | coordinates = {{coord|43.7075|-86.3559|region:US-MI_type:landmark|display=inline}} | locmapin = Michigan#USA | built = | architect = | architecture = | added = December 20, 1999[1] | area = | governing_body = | mpsub = | refnum = 99001534[2] }}}} The US 31–Pentwater River Bridge is a three-span steel bridge that carries Oceana Drive (Old US Highway 31) over the Pentwater River in northern Hart, Michigan. It is listed on the National Register of Historic Places. HistoryPrior to the construction of the current span, US 31 spanned the river in Hart on a bridge that had become a significant bottleneck by the early 1950s. In 1954, a replacement structure was designed by the Michigan State Highway Department. The bridge was designated as a Federal Aid project and the contract for construction was awarded to Gene Fewell. The bridge was completed the next year for $266,564.[1] Since construction, the bridge has been altered little and has undergone repairs only for maintenance reasons.[1] In 1988, the bridge was rehabilitated by replacing the pins and hangers of the non-redundant suspended spans.[3] The bridge was listed on the National Register of Historic Places on December 20, 1999,[4] and the Michigan Department of Transportation placed it on their list of historic bridges.[5] DesignThe bridge has three spans and a total length of {{convert|270|ft|m}}. The two anchor spans are {{convert|84|ft|m}} long and cantilever over the piers to support the {{convert|102|ft|m|adj=on}} center span, {{convert|60|ft|m}} of which is suspended. The deck is {{convert|56|ft|m}} wide and the total width of the bridge is {{convert|63.1|ft|m}}.[1] The bridge is essentially two separate bridges, each with its own structure, separated by a {{convert|4|ft|m|adj=mid|-wide}} divider strip and connected by a {{convert|1|in|cm}} joint along the bridge's length.[1][3] The bridge has two lanes in each direction and the sidewalks are {{convert|2.5|ft|m}} wide.[3] The steel girder design of the US 31–Pentwater River Bridge was widely used by State Highway Department in the 1930s and 1940s. The department used similar designs as early as 1905, but it was not until about 1930 that steel manufacturing techniques could produce a span greater than {{convert|45|ft|m}}.[1] See also{{portal|Michigan|National Register of Historic Places|Bridges}}
References1. ^1 2 3 4 5 6 {{cite web|author=Staff|url=http://www.mcgi.state.mi.us/hso/sites/1821.htm|title=US-31 (Old)/Pentwater River Bridge|work=State Historic Preservation Office|publisher=Michigan State Housing Development Authority|accessdate=September 17, 2012|deadurl=yes|archiveurl=https://archive.is/20121224091703/http://www.mcgi.state.mi.us/hso/sites/1821.htm|archivedate=December 24, 2012|df=}} {{DEFAULTSORT:US 31-Pentwater River Bridge}}2. ^{{NRISref|2009a|dateform=mdy}} 3. ^1 2 {{cite web|title=Old U.S. 31 Over Pentwater River: B01 of 64012|url=http://www.michigan.gov/documents/MDOT-Bows-FC-64012_65617_7.pdf|work=Non-Redundant Fracture-Critical Bridge Inspection Manual|publisher=Michigan Department of Transportation|accessdate=November 3, 2012|format=PDF|page=2|archiveurl=https://web.archive.org/web/20110102150958/http://www.michigan.gov/documents/MDOT-Bows-FC-64012_65617_7.pdf|archivedate=January 2, 2011 |deadurl=no}} 4. ^{{cite web|title=Weekly List of Actions Taken on Properties: 12/20/99 Through 12/23/99|url=http://www.nps.gov/nr/listings/991230.htm|work=National Register of Historic Places|publisher=United States Department of the Interior|accessdate=November 3, 2012}} 5. ^{{cite web|title=US-31 / Pentwater River|url=http://www.michigan.gov/mdot/0,4616,7-151-9620_11154_11188-29216--,00.html|work=Michigan's Historic Bridges|publisher=Michigan Department of Transportation|accessdate=September 6, 2012}} 11 : Transportation in Oceana County, Michigan|Road bridges on the National Register of Historic Places in Michigan|Road bridges in Michigan|Bridges completed in 1956|Steel bridges in the United States|U.S. Route 31|Bridges on the United States Numbered Highways|National Register of Historic Places in Oceana County, Michigan|Cantilever bridges in the United States|Girder bridges in the United States|Buildings and structures in Oceana County, Michigan |
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