| Interstate 405 |
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| Stadium Freeway |
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Interstate 405, also know as the Stadium Freeway, rims the downtown Portland area. The freeway runs between Interstate 5 (across the Fremont Bridge) in the north, connects via the Vista Ridge Tunnel with U.S. 26 (Sunset Highway) to the west, and then rejoins I-5 near the western end of the Marquam Bridge, for a total length of just 4.2 miles.
Most of the I-405 was completed and opened to traffic on February 25, 1969. Its final link, the Fremont Bridge, was opened on November 11, 1973, completing Portland’s “Inner Loop.” Almost 113,000 vehicles travel over the Freemont Bridge on I-405 on an average day.
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| Interesting Facts |
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Most expensive interstate spur
The clearing of densely developed commercial structures near the heart of downtown Portland, land acquisition, multiple grade crossings, and the depressed (below city streets) construction of Interstate 405 combined to make it, per mile, one of the single most expensive interstate projects in Oregon’s history — with a cost of $121 million.
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