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33-528: The Marquam Bridge / ˈ m ɑːr k əm / is a double-deck, steel-truss cantilever bridge 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. The upper deck carries northbound traffic;

66-423: A balanced cantilever ; when they attach to a solid foundation, the counterbalancing arms are called anchor arms . Thus, in a bridge built on two foundation piers, there are four cantilever arms: two which span the obstacle, and two anchor arms that extend away from the obstacle. Because of the need for more strength at the balanced cantilever's supports, the bridge superstructure often takes the form of towers above

99-505: A bridge that could handle differential settlement of the foundations. Engineers could more easily calculate the forces and stresses with a hinge in the girder. Heinrich Gerber was one of the engineers to obtain a patent for a hinged girder (1866) and is recognized as the first to build one. The Hassfurt Bridge over the Main river in Germany with a central span of 124 feet (38 metres)

132-516: A large theatre, as well as a box office , four parking garages, a 40,000-square-foot (3,700-square-meter) convention facility, several restaurants and bars, and a large public space, the Rose Quarter Commons . The Moda Center is a 785,000-square-foot (7.29-hectare), 19,980-seat multipurpose arena. The arena is divided into two major sections, an upper and lower bowl, separated by a level of luxury boxes . The arena opened in 1995, and

165-664: 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. Cantilever bridge The steel truss cantilever bridge was a major engineering breakthrough when first put into practice, as it can span distances of over 1,500 feet (450 m), and can be more easily constructed at difficult crossings by virtue of using little or no falsework . Engineers in

198-494: Is available to support the tension in the upper chord of the span during construction, usually limiting this method to the spanning of narrow canyons. World's longest cantilever bridges (by longest span): Rose Quarter The Rose Quarter is a 30-acre (12-hectare) sports and entertainment district located in Portland's Lloyd District on the east bank of the Willamette River , just east of downtown . The Rose Quarter

231-764: Is bounded on the west by NE Interstate Avenue, on the north by NE Broadway and NE Weidler Streets, on the east by Interstate 5 , and on the south by NE Holladay Street. The site contains two multipurpose arenas, the Moda Center and the Memorial Coliseum . Nearby landmarks include the Steel and Broadway bridges, the Oregon Convention Center , and the Eastbank Esplanade . The Rose Quarter contains two multipurpose arenas and

264-638: Is located south of the arena, in an underpass where the tracks cross under Interstate 5. A separate station, the Interstate/Rose Quarter station, is located on the western side of the Rose Quarter campus and serves riders on the Yellow Line . Tri-Met also operates several bus lines which serve the arena as well as C-Tran's express routes 105 and 105X. The Rose Quarter offers over 2,600 parking spaces for Rose Quarter patrons on

297-533: Is still actively used for Portland Winterhawks hockey games. The arena is also used for concerts, circuses, rodeos, ice shows, and conventions, and hosted the 2007 Davis Cup final between the United States and Russia. The Coliseum is known as the "Glass Palace". Two MAX Light Rail stations serve the Rose Quarter area. The Rose Quarter Transit Center is located on the Red , Blue and Green Lines, and

330-870: Is the current home of the Portland Trail Blazers of the National Basketball Association . The Moda Center previously hosted home games for the Portland Winterhawks of the Western Hockey League , and the Portland LumberJax of the National Lacrosse League . It is also used for concerts, circuses, rodeos, ice shows, and conventions. The Veterans Memorial Coliseum is a 12,888-seat multipurpose arena located on

363-653: The Fremont Bridge . 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." The bridge crosses over and runs parallel to parts of the now named Vera Katz Eastbank Esplanade . Options to replace the bridge historically considered have been to reroute I-5 over

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396-465: The Navajo Bridge ) are built using pure cantilever spans from each side, with neither falsework below nor temporary supporting towers and cables above. These are then joined with a pin, usually after forcing the union point apart, and when jacks are removed and the bridge decking is added the bridge becomes a truss arch bridge . Such unsupported construction is only possible where appropriate rock

429-435: The 19th century understood that a bridge that was continuous across multiple supports would distribute the loads among them. This would result in lower stresses in the girder or truss and meant that longer spans could be built. Several 19th-century engineers patented continuous bridges with hinge points mid-span. The use of a hinge in the multi-span system presented the advantages of a statically determinate system and of

462-684: The City owns the remainder of the Rose Quarter premises. VSE are responsible for managing all Rose Quarter properties. Management and operation of the Rose Quarter is contracted out to AEG. Who is under contract to run the Garden until August 2008. The Rose Quarter was created in 1993, when significant parts of the parking lot of the Memorial Coliseum were transferred to the Oregon Arena Corporation , an operating company owned by Paul Allen , to facilitate construction of

495-624: The Rose Garden Arena, later renamed the Moda Center . As part of the agreement, the Oregon Arena Corporation would be given the right to jointly manage both the new arena and the existing Coliseum, as well as other facilities and amenities on the grounds. The new arena would soon be christened the "Rose Garden", and the grounds of the Coliseum would be reborn as the Rose Quarter . The City of Portland hoped that

528-460: The Rose Garden and the underlying land, together with the rights to manage other Rose Garden properties; and formed a new corporation, Portland Arena Management LLC ("PAM") to manage the property acquired in the bankruptcy proceedings. PAM soon hired Global Spectrum to operate the arena and the remainder of the Rose Quarter. In 2007, Allen repurchased the arena from the creditors, along with

561-711: The Rose Quarter campus. Built in 1960, it was the original home of the Portland Trail Blazers. Three NBA Finals have been played within its walls, and twice the Larry O'Brien Trophy has been secured on its hardwood, once by the Trail Blazers in 1977, and once by the opposing Detroit Pistons in 1990. It remained the Blazers home court until the team moved into the larger and more modern Rose Garden Arena (since renamed to Moda Center) in 1995. The arena

594-415: The action of the outer foundations. Cantilever Bridge.—A structure at least one portion of which acts as an anchorage for sustaining another portion which extends beyond the supporting pier. A simple cantilever span is formed by two cantilever arms extending from opposite sides of an obstacle to be crossed, meeting at the center. In a common variant, the suspended span , the cantilever arms do not meet in

627-578: The arena is also available. The Rose Quarter is jointly owned by the Vulcan Sports and Entertainment (VSE) and the City of Portland . (VSE) is a subsidiary of Vulcan Inc. , a holding company owned by Paul Allen which manages Allen's various sports-related properties. Tod Leiweke is the current president of Vulcan Sports and Entertainment. VSE owns the Moda Center and the underlying land;

660-412: The building of the arena would lead to other renovation or development in the Rose Quarter district, but as of 2007 this has yet to materialize. Several restaurants and bars operate on the Rose Quarter property. Oregon Arena Corporation managed the entire Rose Quarter, including those portions still owned by the city, until it was dissolved in a 2004 bankruptcy . The arena creditors took possession of

693-423: The center; instead, they support a central truss bridge which rests on the ends of the cantilever arms. The suspended span may be built off-site and lifted into place, or constructed in place using special travelling supports. A common way to construct steel truss and prestressed concrete cantilever spans is to counterbalance each cantilever arm with another cantilever arm projecting the opposite direction, forming

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726-570: 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. Proposals have been made to replace the Eastbank Freeway portion of I-5 with

759-648: The foundation piers. The Commodore Barry Bridge is an example of this type of cantilever bridge. Steel truss cantilevers support loads by tension of the upper members and compression of the lower ones. Commonly, the structure distributes the tension via the anchor arms to the outermost supports, while the compression is carried to the foundations beneath the central towers. Many truss cantilever bridges use pinned joints and are therefore statically determinate with no members carrying mixed loads. Prestressed concrete balanced cantilever bridges are often built using segmental construction . Some steel arch bridges (such as

792-467: 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 . 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. Even prior to construction, it

825-592: The premises. The spaces are distributed among four parking garages and two uncovered parking lots. In addition, arena management operates a pair of off-site parking lots with 1,700 additional spaces, located several blocks from the arena. Both off-site facilities are located on the MAX Light Rail line, which provides service to the Rose Quarter. Parking prices vary depending on the event, typically between US$ 8 and US$ 15 per vehicle. The parking garages are operated by City Center Parking. On-street parking near

858-558: The state. Part of the design process also utilized computers for various calculations. 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. (In particular, it blocked the view of downtown from the Union Avenue Viaduct.) This led to public input in the design of

891-431: The structural principles of the suspended span cantilever by sitting in chairs and supporting their colleague, Kaichi Watanabe , in between them, using just their arms and wooden poles. The suspended span, where Watanabe sits, is in the center. The wooden poles resist the compression of the lower chord , while the outstretched arms support the tension of the upper chord. The placement of the brick counterweights demonstrates

924-428: The upper deck is 20 feet (6.1 m) above the lower. The Marquam was designed by Ivan D. Merchant and Pieter Kiewit Sons Company served as the general contractor. 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. The bridge was designed with four lanes in each direction. It was the first double-deck freeway bridge in

957-593: The upper northbound deck on October 18, 1966. The bridge was designed and built by the Oregon Department of Transportation at a cost of $ 14 million, equivalent to $ 131 million today. Funds for the project came from the Federal Highway Transportation Act . The bridge was redecked in 1983. 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

990-574: Was 275 feet (84 metres) deep and took full advantage of the fact that falsework, or temporary support, is not needed for the main span of a cantilever bridge. The Forth Bridge is a notable example of an early cantilever bridge. This bridge held the record for longest span in the world for twenty-nine years until it was surpassed by the Quebec Bridge . The engineers responsible for the bridge, Sir Benjamin Baker and Sir John Fowler , demonstrated

1023-423: Was built. 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. The main span of the bridge is 440 ft (130 m) long and the two side spans are 301 ft (92 m) each for a total length of 1,043 ft (318 m). Vertical clearance of the lower deck is 130 feet (40 m) and

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1056-550: Was completed in 1867 and is recognized as the first modern cantilever bridge. The High Bridge of Kentucky by C. Shaler Smith (1877), the Niagara Cantilever Bridge by Charles Conrad Schneider (1883) and the Poughkeepsie Bridge by John Francis O'Rourke and Pomeroy P. Dickinson (1889) were all important early uses of the cantilever design. The Kentucky River Bridge spanned a gorge that

1089-572: Was decided to name the span after Philip Marquam . 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. Construction on the bridge's support piers began in January 1962. Construction on the bridge finished on February 28, 1966. The lower southbound deck was opened on October 4, 1966, and

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