Conde McCullough’s Arch Bridge & The Municipal Elevator: Engineering Across the Gorge
Explore Conde McCullough's 1922 gunite rainbow Arch Bridge and the iconic 1955 Oregon City Municipal Elevator—North America's only vertical street.
A Note from Klaus the AI (Local History Synthesizer): This architectural and engineering study was developed using the proprietary research methodology — Carlos-guided archival research, AI-synthesized ODOT engineering blueprints, and 100% human-fact-checked bridge preservation archives.
30-Second Historical Snapshot
Built in 1922 by master designer Conde McCullough, the Oregon City–West Linn Arch Bridge replaced early wooden crossings, operating alongside Oregon City’s 1955 Municipal Elevator—North America's only vertical street—to connect river-level mills with cliffside neighborhoods.
1. McCullough’s Masterpiece: The 1922 Gunite Arch Bridge
Before 1922, crossing between Oregon City and West Linn required a slow wooden ferry or an aging 1888 suspension bridge that rattled under heavy wagon loads. Oregon State Highway Department Chief Bridge Engineer Conde B. McCullough designed a revolutionary 745-foot steel through-arch structure encased entirely in shotcrete (gunite).
McCullough encased the structural steel in gunite to protect the bridge from the corrosive sulfur fumes emitted by adjacent paper mills. Featuring classical Gothic and Art Deco pylons, open spandrel arches, and curved bracketed sidewalks, the bridge opened to statewide celebration on December 28, 1922, instantly becoming an engineering icon of the Pacific Highway (Highway 99E).
2. America’s Only Vertical Street: The Municipal Elevator
Oregon City is geologically divided into two distinct levels: a narrow basalt river terrace housing mills and rail lines, and a towering 90-foot basalt cliff holding residential neighborhoods. For decades, workers climbed grueling wooden stairways containing 722 steps to return home each evening.
In December 1915, the city built its first hydraulic water-powered elevator. In May 1955, it was replaced by the current 130-foot modernist saucer-topped structure designed by Gordon E. Trapp. Designated officially as "Elevator Street," it is the only municipal elevator in North America that serves as a legally designated public roadway, carrying over 200,000 riders annually free of charge.
3. The Cliffside Promenade & Bridge Restoration
From the top elevator portal, visitors step out onto the historic Grand Avenue Cliffside Promenade, offering panoramic views across the gorge to Willamette Falls and West Linn.
In 2012, ODOT completed a meticulous $15 million restoration of McCullough's Arch Bridge, repairing the historic gunite casing and restoring historic pedestrian streetlamps. Today, cyclists and pedestrians can ride smoothly across the arch span directly to the elevator base.
"Then & Now" Geo-Physical Mapping
Historic Site (1922/1955): The 1922 McCullough Arch Bridge span and 1955 Municipal Elevator tower.
Modern Rider Landmark: Ride directly across the bridge from West Linn on Highway 43 to Oregon City's lower portal at 7th and Railroad Avenue, then take your e-bike directly up the elevator to the bluff!
Frequently Asked Questions
Why is the Oregon City Municipal Elevator called a "Vertical Street"?
Because it is officially registered as a public highway in the municipal road system, connecting lower Railroad Avenue with upper 7th Street.
Can you bring bicycles on the Oregon City Municipal Elevator?
Yes. Standard bicycles and electric bicycles are fully permitted inside the spacious elevator cabin.
← Return to the Master Willamette Falls & West Linn History Guide