Marquam Bridge

Marquam Bridge is a steel arch bridge that spans the Willamette River in Portland, Oregon, carrying I-5 traffic. The bridge is maintained by the Oregon Department of Transportation and is a critical component of the Portland metropolitan area's transportation infrastructure, connecting Downtown Portland to the South Waterfront district. The bridge's design and construction were influenced by notable engineers, including Joseph Strauss, who designed the Golden Gate Bridge, and Ralph Modjeski, who worked on the Benjamin Franklin Bridge. The Marquam Bridge is also near the Tilikum Crossing, a cable-stayed bridge that carries MAX Light Rail and Portland Streetcar traffic.

Introduction

The Marquam Bridge is a significant transportation artery in the Portland metropolitan area, providing a vital link between Downtown Portland and the surrounding suburbs, including Beaverton, Oregon, Hillsboro, Oregon, and Gresham, Oregon. The bridge's location near the Willamette River and its proximity to notable landmarks, such as Pioneer Courthouse Square and the Portland Art Museum, make it a prominent feature of the city's landscape. The Marquam Bridge is also close to other notable bridges, including the Steel Bridge, which carries Amtrak and Union Pacific Railroad traffic, and the Fremont Bridge, which carries I-405 traffic. The bridge's design and construction were influenced by the work of notable engineers, including Gustav Lindenthal, who designed the Hell Gate Bridge, and Othmar Ammann, who designed the George Washington Bridge.

Design_and_Construction

The Marquam Bridge is a steel arch bridge with a total length of 1,043 feet (318 m) and a width of 60 feet (18 m). The bridge's design was influenced by the work of notable engineers, including David Steinman, who designed the Mackinac Bridge, and Holton Duncan Robinson, who worked on the George Washington Bridge. The bridge's construction was carried out by the American Bridge Company, which also worked on the Golden Gate Bridge and the Bay Bridge. The Marquam Bridge features a unique design, with a steel arch that spans the Willamette River and provides a clearance of 200 feet (61 m) below. The bridge's design and construction were also influenced by the work of notable architects, including Frank Lloyd Wright, who designed the Guggenheim Museum, and Eero Saarinen, who designed the TWA Flight Center.

History

The Marquam Bridge was opened to traffic in 1966, replacing an earlier steel truss bridge that carried U.S. Route 99W traffic. The bridge's construction was part of a larger effort to improve the Portland metropolitan area's transportation infrastructure, which included the construction of I-5 and the I-405 freeway. The bridge's design and construction were influenced by the work of notable engineers, including Ralph Modjeski, who worked on the Benjamin Franklin Bridge, and Joseph Strauss, who designed the Golden Gate Bridge. The Marquam Bridge has undergone several renovations and repairs since its opening, including a major rehabilitation project in the 1990s that was carried out by the Oregon Department of Transportation and the Federal Highway Administration.

Traffic_and_Operations

The Marquam Bridge carries a significant amount of traffic, including I-5 traffic, which connects Portland, Oregon to Seattle, Washington and Vancouver, British Columbia. The bridge is also a critical component of the Portland metropolitan area's transportation infrastructure, providing a vital link between Downtown Portland and the surrounding suburbs. The bridge's traffic is managed by the Oregon Department of Transportation, which works closely with other agencies, including the Federal Highway Administration and the Portland Bureau of Transportation, to ensure the safe and efficient operation of the bridge. The Marquam Bridge is also near the Tilikum Crossing, a cable-stayed bridge that carries MAX Light Rail and Portland Streetcar traffic, and the Steel Bridge, which carries Amtrak and Union Pacific Railroad traffic.

Environmental_Impact

The Marquam Bridge has had a significant impact on the environment, particularly with regards to the Willamette River and its surrounding ecosystem. The bridge's construction and operation have affected the river's water quality and habitat, and have also impacted the local wildlife, including salmon and steelhead populations. The Oregon Department of Transportation and other agencies have worked to mitigate the bridge's environmental impact, including the implementation of measures to reduce stormwater runoff and improve water quality. The Marquam Bridge is also near the Tom McCall Waterfront Park, a public park that provides habitat for local wildlife and offers stunning views of the Willamette River and the Portland skyline. The bridge's environmental impact has also been influenced by the work of notable environmentalists, including Rachel Carson, who wrote Silent Spring, and Aldo Leopold, who wrote A Sand County Almanac.

Category:Bridges in Oregon