View source for Siuslaw River Bridge

{{Use American English|date=January 2025}}
{{Use mdy dates|date=August 2023}}
{{Infobox bridge
|fetchwikidata=coordinates
|name=Siuslaw River Bridge
|image=Siuslaw_River_Bridge_bascule_type.png
|carries={{jct|state=OR|US|101}}
|crosses=[[Siuslaw River]]
|locale=[[Florence, Oregon]]
|maint=[[Oregon Department of Transportation|ODOT]]
|design=Double [[Tied-arch bridge|tied-arch]] with central [[Bascule bridge|bascule]] draw span
|mainspan={{Convert|140|ft}}
|length={{Convert|1568|ft}}
|open=March 31, 1936
{{Infobox NRHP
  | embed = yes
  | name = Siuslaw River Bridge No. 01821
  | nrhp_type = 
  | image = 
  | caption = 
  | location = OR Coast 9, US101, MP109.98, [[Florence, Oregon]]
  | locmapin = Oregon#USA
  | built = 1935–36
  | architect = [[Conde McCullough|Conde B. McCullough]]
  | builder = Mercer-Fraser Company
  | architecture = Late 19th and 20th Century Revivals, Modern Movement
  | added = August 5, 2005<ref name="OPRD list"/>
  | area = {{convert|2.2|acre}}
  | mpsub = McCullough, C. B., Major Oregon Coast Highway Bridges MPS
  | refnum = 05000816<ref name="OPRD list"/><ref name="nris">{{NRISref|version=2010a}}</ref>
}}
}}

The '''Siuslaw River Bridge''' is a [[bascule bridge]] that spans the [[Siuslaw River]] on [[U.S. Route 101 in Oregon|U.S. Route 101]] in [[Florence, Oregon]]. It was designed by [[Conde McCullough]], built by the Mercer-Fraser Company of [[Eureka, California]], and funded by the Federal Emergency Administration of Public Works (later renamed the [[Public Works Administration]]). It opened in 1936.<ref name="Hadlow">{{Cite book |last1=Hadlow |first1=Robert W. |title=Elegant Arches, Soaring Spans: C. B. McCullough, Oregon's Master Bridge Builder |date=2001 |publisher=Oregon State University Press |isbn=0-87071-534-8 |pages=93–94, 105, 138}}</ref>

The bridge's total length is {{convert|1568|ft|m}}.<ref name="Hadlow"/> When open, the {{convert|140|ft|m|adj=on}} double-leaf bascule provides {{convert|110|ft|m}} of horizontal clearance for boat traffic. The bascule section is flanked by two {{convert|154|ft|m|adj=on}} reinforced concrete tied arches, identical to those used in the original [[Alsea Bay Bridge]].<ref name="Hadlow"/> Four [[Art Deco]]-style [[obelisk]]s house mechanical equipment as well as living quarters for the bridge operator. The total cost of the bridge was $527,000 (equivalent to ${{Inflation|US|0.527|1935|r=1}}&nbsp;million in {{Inflation-year|US}}{{Inflation-fn|US}}).

[[File:Siuslaw River Bridge (32526334940).jpg|thumb|left|The bridge with its bascule draw span opening]]
The bridge was added to the [[National Register of Historic Places]] on August 5, 2005.<ref name="OPRD list">{{Cite web |title=Oregon National Register List |publisher=[[Oregon Parks and Recreation Department]] |url=http://www.oregon.gov/OPRD/HCD/NATREG/docs/oregon_nr_list.pdf |page=22 |date=June 6, 2011 |access-date=June 7, 2013}}</ref>

A new computerized control mechanism for the drawbridge was installed in 2011. It does not require an operator to be present at both the north and south portions to raise the drawbridge like the manual controls do. However, the manual system is still in working order.<ref name="Hadlow"/><ref>{{cite web |last=Mariner |first=Cosmos |date=October 18, 2020 |title=Siuslaw River Bridge |url= https://www.hmdb.org/m.asp?m=113260 |website=hdmb.org |location=The Historical Marker Database |publisher=Andrew Ruppenstein |access-date=August 30, 2025}}</ref>

==See also==
*{{Portal-inline|Transport}}
*{{Portal-inline|Engineering}}
*{{Portal-inline|Oregon}}
*[[List of bridges documented by the Historic American Engineering Record in Oregon]]
*[[List of bridges on the National Register of Historic Places in Oregon]]
*[[List of bridges on U.S. Route 101 in Oregon]]

==References==
{{Reflist}}

==External links==
*{{Commons category-inline}}
*{{HAER |survey=OR-58 |id=or0287 |title=Siuslaw River Bridge, Spanning Siuslaw River at Oregon Coast Highway, Florence, Lane County, OR |photos=25 |color=2 |data=7 |cap=4}}
*{{Structurae|id=20002399|title=Siuslaw River Bridge}}
*{{YouTube|id=AvSq5LNEiDE|title=Video of bridge's bascule span open}}

{{Authority control}}

[[Category:Bridges completed in 1936]]
[[Category:Bascule bridges in the United States]]
[[Category:Road bridges on the National Register of Historic Places in Oregon]]
[[Category:Public Works Administration in Oregon]]
[[Category:U.S. Route 101]]
[[Category:National Register of Historic Places in Lane County, Oregon]]
[[Category:Bridges in Lane County, Oregon]]
[[Category:Tied arch bridges in the United States]]
[[Category:Art Deco architecture in Oregon]]
[[Category:Historic American Engineering Record in Oregon]]
[[Category:Bridges by Conde McCullough]]
[[Category:Bridges of the United States Numbered Highway System]]
[[Category:1936 establishments in Oregon]]
[[Category:Drawbridges on the National Register of Historic Places]]
[[Category:Concrete bridges in the United States]]

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