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1996•Civil engineeringRequires access

PORTLAND'S LIGHT RAIL GOES UNDERGROUND

Philip M. Rice, Joseph P. Gildner

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Abstract

A 29-km extension of Portland’s first modern light rail system nears completion. The extension includes a 4.6 km twin-tunnel section and the deepest transit station in North America. Light rail is important to the city of Portland. Tri-County Metropolitan Transportation District of Oregon (Tri-Met) operates the Max System, a single-route, 24-km line that runs east from downtown, crossing the Willamette River on the 84-year-old Steel Bridge. In 1993,Tri-Met began construction of the Westside Light Rail Project, 29-km westward extension to the town of Hillsboro. Approximately 4.6 km of twin tunnel carries the alignment through the West Hills, which rise several hundred feet at the edge of the city center. Excavation of the tunnels and Washington Park Station presented major construction and mining challenges.

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What this paper is about

A 29-km extension of Portland’s first modern light rail system nears completion. The extension includes a 4.6 km twin-tunnel section and the deepest transit station in North America. Light rail is important to the city of Portland. Tri-County Metropolitan Transportation District of Oregon (Tri-Met) operates the Max System, a single-route, 24-km line that runs east from downtown, crossing the Willamette River on the 84-year-old Steel Bridge. In 1993,Tri-Met began construction of the Westside Light Rail Project, 29-km westward extension to the town of Hillsboro. Approximately 4.6 km of twin tunnel carries the alignment through the West Hills, which rise several hundred feet at the edge of the city center. Excavation of the tunnels and Washington Park Station presented major construction and mining challenges.

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Available abstract

A 29-km extension of Portland’s first modern light rail system nears completion. The extension includes a 4.6 km twin-tunnel section and the deepest transit station in North America. Light rail is important to the city of Portland. Tri-County Metropolitan Transportation District of Oregon (Tri-Met) operates the Max System, a single-route, 24-km line that runs east from downtown, crossing the Willamette River on the 84-year-old Steel Bridge. In 1993,Tri-Met began construction of the Westside Light Rail Project, 29-km westward extension to the town of Hillsboro. Approximately 4.6 km of twin tunnel carries the alignment through the West Hills, which rise several hundred feet at the edge of the city center. Excavation of the tunnels and Washington Park Station presented major construction and mining challenges.

Key concepts: Downtown, Light rail transit, Light rail, Excavation, Metropolitan area, Archaeology, Twin cities, Rail transportation

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