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Location: Portland, Oregon
Fremont Bridge: Finished in 1973, this is Portland's newest bridge over the Willamette.
The double-decked Fremont Bridge connects northbound I-405 and westbound
US-30 to I-5. It weighs 6,000 tons and was lifted 170 feet - a Guinness
Book of World Records entry for heaviest lift ever made at the time.
The tied arch span is 902 feet long and was not built on-site but floated
on the river into place. [1]
References:
[1] Smith, Dwight. Historic Highway Bridges of Oregon. Second
Edition. Portland, Oregon: Oregon Historical Society, 1989. P. 300.