Interstate Bridge, Vertical lift bridge across Columbia River between Portland and Vancouver.
Two identical steel bridges span 3,528 feet across the Columbia River, with center lift spans rising 174 feet high for water traffic passage.
The first span opened in 1917 at a cost of 1.75 million dollars, funded by Clark and Multnomah counties through a five-cent vehicle toll.
The bridge structure demonstrates the engineering capabilities of the early 20th century, connecting two major urban centers across state lines.
The northbound span accommodates 5,700 vehicles per hour, with bridge lifts occurring 20 to 30 times monthly for maritime traffic passage.
The 278-foot lift spans represent the longest vertical lift bridge segments constructed in Washington State.
Location: Portland
Location: Vancouver
Architects: HNTB
Official opening: February 14, 1917
GPS coordinates: 45.60667,-122.68083
Latest update: September 23, 2025 16:45
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