Marquam Bridge: Difference between revisions

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The '''Marquam Bridge''' {{IPAc-en|ˈ|m|ɑr|k|əm}} is a double-deck, [[cantilever bridge|steel-truss cantilever bridge]]<ref name="Bottenberg">{{Cite book |url={{Google books |laTfY36RfY0C |pg=PA97 |plainurl=yes}} |last=Bottenberg |first=R. |date=2007 |title=Bridges of Portland |publisher=Arcadia Publishing |access-date=June 20, 2012}}</ref> that carries [[Interstate 5]] traffic across the [[Willamette River]] from south of downtown [[Portland, Oregon]], on the west side to the industrial area of inner [[Southeast Portland, Oregon|Southeast]] on the east. It is the busiest bridge in [[Oregon]], carrying 140,500&nbsp;vehicles a day as of 2016.<ref>{{Cite journal |title=Historical Traffic Data |url=https://www.oregon.gov/ODOT/Data/Documents/TVT_2016.pdf |journal=2016 Traffic Volumes on State Highways |publisher=Oregon Department of Transportation |access-date=July 3, 2018}}</ref> The upper deck carries northbound traffic; the lower deck carries southbound traffic. The Marquam also has on and off ramps for Interstate 405 on the south end of the bridge, while the terminus on the east bank of the river is near the interchange with [[Interstate 84 in Oregon|Interstate 84]].
The '''Marquam Bridge''' {{IPAc-en|ˈ|m|ɑr|k|əm}} is a double-deck, [[cantilever bridge|steel-truss cantilever bridge]]<ref name="Bottenberg">{{Cite book |url={{Google books |laTfY36RfY0C |pg=PA97 |plainurl=yes}} |last=Bottenberg |first=R. |date=2007 |title=Bridges of Portland |publisher=Arcadia Publishing |access-date=June 20, 2012}}</ref> opened in 1966 that carries [[Interstate 5]] traffic across the [[Willamette River]] from south of downtown [[Portland, Oregon]], on the west side to the industrial area of inner [[Southeast Portland, Oregon|Southeast]] on the east. It is the busiest bridge in [[Oregon]], carrying 140,500&nbsp;vehicles a day as of 2016.<ref>{{Cite journal |title=Historical Traffic Data |url=https://www.oregon.gov/ODOT/Data/Documents/TVT_2016.pdf |journal=2016 Traffic Volumes on State Highways |publisher=Oregon Department of Transportation |access-date=July 3, 2018}}</ref> The upper deck carries northbound traffic; the lower deck carries southbound traffic. The Marquam also has on and off ramps for Interstate 405 on the south end of the bridge, while the terminus on the east bank of the river is near the interchange with [[Interstate 84 in Oregon|Interstate 84]].


==History==
==History==
Planning for the span started in 1956 as the last link in Oregon for the new [[Interstate Highway System]] for the main north-south route through the state.<ref name="hallman2015"/> Even prior to construction, it was decided to name the span after [[Philip Augustus Marquam|Philip Marquam]].<ref name="HAER"/> Marquam was a state legislator and [[Multnomah County]] judge, who owned much of [[Marquam Hill, Portland, Oregon|Marquam Hill]] where [[Oregon Health & Science University]] and the [[Veterans Affairs Medical Center]] now stand.<ref name="hallman2015">{{Cite news |last1=Hallman Jr. |first1=Tom |title=Marquam Bridge lacks beauty and basic amenities but excels in function: 'Spanning Oregon' |url=https://www.oregonlive.com/portland-bridges/2015/10/the_marquam_bridge_lacks_beaut.html |access-date=July 10, 2022 |work=Oregonlive / The Oregonian |date=October 24, 2015 |language=en}}</ref> Construction on the bridge's support piers began in January 1962.<ref>{{Cite news |last=Wood |first=Sharon M. |date=May 14, 1984 |title=Marquam Bridge signals new life in the fast lane |page=B5 |work=The Oregonian}}</ref> Construction on the bridge finished on February 28, 1966.<ref name="HAER"/> The lower southbound deck was opened on October 4, 1966, and the upper northbound deck on October 18, 1966.<ref name="HAER"/>
Planning for the span started in 1956 as the last link in Oregon for the new [[Interstate Highway System]] for the main north-south route through the state.<ref name="hallman2015"/> Even prior to construction, it was decided to name the span after [[Philip Augustus Marquam|Philip Marquam]].<ref name="HAER"/> Marquam was a state legislator and [[Multnomah County]] judge, who owned much of [[Marquam Hill, Portland, Oregon|Marquam Hill]] where [[Oregon Health & Science University]] and the [[Veterans Affairs Medical Center]] now stand.<ref name="hallman2015">{{Cite news |last1=Hallman Jr. |first1=Tom |title=Marquam Bridge lacks beauty and basic amenities but excels in function: 'Spanning Oregon' |url=https://www.oregonlive.com/portland-bridges/2015/10/the_marquam_bridge_lacks_beaut.html |access-date=July 10, 2022 |work=Oregonlive / The Oregonian |date=October 24, 2015 |language=en}}</ref> Construction on the bridge's support piers began in January 1962.<ref>{{Cite news |last=Wood |first=Sharon M. |date=May 14, 1984 |title=Marquam Bridge signals new life in the fast lane |page=B5 |work=The Oregonian}}</ref> Construction on the bridge finished on February 28, 1966.<ref name="HAER"/> The lower southbound deck was opened on October 4, 1966, and the upper northbound deck on October 18, 1966.<ref name="HAER"/>
[[File:MarquamBridgeHill.jpg|thumb|left|The Marquam Bridge over the Willamette River, viewed from the southwest, atop Marquam Hill]]
 
[[File:MarquamBridgeHill.jpg|thumb|left|The Marquam Bridge over the Willamette River, viewed from the southwest, atop [[Marquam Hill, Portland, Oregon|Marquam Hill]]]]


The bridge was designed and built by the [[Oregon Department of Transportation]] at a cost of $14&nbsp;million, equivalent to ${{Formatprice| {{Inflation|US|14000000|1966|r=-3}} }} today. Funds for the project came from the [[Federal-Aid Highway Act of 1956|Federal Highway Transportation Act]].<ref name="HAER"/> The bridge was redecked in 1983.<ref name="HAER"/> In 1990, the approach lanes from both the east and west were widened to allow four lanes of traffic and an off-ramp to Water Avenue was built.<ref name="HAER"/> Due to its importance, the Marquam was the first Portland bridge to undergo a [[seismic retrofit]] in 1995, which included installation of Italian made [[Rolling-element bearing|bearings]] add to the piers.<ref>{{Cite web |title=Seismic Protection Devices Study – Marquam Bridge |url=https://www.oregon.gov/ODOT/Programs/ResearchDocuments/SeismicProtection.pdf |publisher=Oregon Department of Transportation |access-date=July 10, 2022 |date=April 2000}}</ref>
The bridge was designed and built by the [[Oregon Department of Transportation]] at a cost of $14&nbsp;million, equivalent to ${{Formatprice| {{Inflation|US|14000000|1966|r=-3}} }} today. Funds for the project came from the [[Federal-Aid Highway Act of 1956|Federal Highway Transportation Act]].<ref name="HAER"/> The bridge was redecked in 1983.<ref name="HAER"/> In 1990, the approach lanes from both the east and west were widened to allow four lanes of traffic and an off-ramp to Water Avenue was built.<ref name="HAER"/> Due to its importance, the Marquam was the first Portland bridge to undergo a [[seismic retrofit]] in 1995, which included installation of Italian made [[Rolling-element bearing|bearings]] add to the piers.<ref>{{Cite web |title=Seismic Protection Devices Study – Marquam Bridge |url=https://www.oregon.gov/ODOT/Programs/ResearchDocuments/SeismicProtection.pdf |publisher=Oregon Department of Transportation |access-date=July 10, 2022 |date=April 2000}}</ref>

Latest revision as of 14:24, 19 June 2025

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The Marquam Bridge Template:IPAc-en is a double-deck, steel-truss cantilever bridge[1] opened in 1966 that carries Interstate 5 traffic across the Willamette River from south of downtown Portland, Oregon, on the west side to the industrial area of inner Southeast on the east. It is the busiest bridge in Oregon, carrying 140,500 vehicles a day as of 2016.[2] The upper deck carries northbound traffic; the lower deck carries southbound traffic. The Marquam also has on and off ramps for Interstate 405 on the south end of the bridge, while the terminus on the east bank of the river is near the interchange with Interstate 84.

History

Planning for the span started in 1956 as the last link in Oregon for the new Interstate Highway System for the main north-south route through the state.[3] Even prior to construction, it was decided to name the span after Philip Marquam.[4] Marquam was a state legislator and Multnomah County judge, who owned much of Marquam Hill where Oregon Health & Science University and the Veterans Affairs Medical Center now stand.[3] Construction on the bridge's support piers began in January 1962.[5] Construction on the bridge finished on February 28, 1966.[4] The lower southbound deck was opened on October 4, 1966, and the upper northbound deck on October 18, 1966.[4]

File:MarquamBridgeHill.jpg
The Marquam Bridge over the Willamette River, viewed from the southwest, atop Marquam Hill

The bridge was designed and built by the Oregon Department of Transportation at a cost of $14 million, equivalent to $Template:Formatprice today. Funds for the project came from the Federal Highway Transportation Act.[4] The bridge was redecked in 1983.[4] In 1990, the approach lanes from both the east and west were widened to allow four lanes of traffic and an off-ramp to Water Avenue was built.[4] Due to its importance, the Marquam was the first Portland bridge to undergo a seismic retrofit in 1995, which included installation of Italian made bearings add to the piers.[6]

Design

The main span of the bridge is Template:Convert long and the two side spans are Template:Convert each for a total length of Template:Convert.[3] Vertical clearance of the lower deck is Template:Convert and the upper deck is Template:Convert above the lower. The Marquam was designed by Ivan D. Merchant and Pieter Kiewit Sons Company served as the general contractor.[4] At the eastern end of the bridge, on the lower deck, is a ramp stub which was intended to connect to the later abandoned Mount Hood Freeway project.[7] The bridge was designed with four lanes in each direction.[4] It was the first double-deck freeway bridge in the state.[4] Part of the design process also utilized computers for various calculations.[8]

The Marquam Bridge was built with economy in mind and the public at large reacted unfavorably to the structure's bland aesthetics, which included a formal protest from the Portland Arts Commission.[9] (In particular, it blocked the view of downtown from the Union Avenue Viaduct.) This led to public input in the design of the Fremont Bridge.[3] During Mayor Vera Katz's State of the City address in 2001, she said, "It’s like having the Berlin Wall dividing east and west, with all the subtle charm of the Daytona 500 smack dab in the middle of our city."[10] The bridge crosses over and runs parallel to parts of the now named Vera Katz Eastbank Esplanade.

Future

File:Marquam Bridge Portland.jpg
A view of the bridge at dusk

Options to replace the bridge historically considered have been to reroute I-5 over the existing I-405 alignment, connecting I-84 to I-5 at the Fremont Bridge interchange, following the US 30 alignment, and removing the Marquam permanently. Another option would build a tunnel under the Willamette River approximately following the existing I-5 alignment, and remove the Marquam Bridge permanently.Script error: No such module "Unsubst".

Proposals have been made to replace the Eastbank Freeway portion of I-5 with a tunnel, connecting with the existing alignment at the Marquam Bridge and the Rose Quarter. This would free up space along the Willamette River for development.[11]

See also

References

Template:Reflist

External links

Template:Sister project

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Template:South Portland, Portland, Oregon

  1. ↑ Script error: No such module "citation/CS1".
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  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
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