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Old Posted Sep 12, 2018, 5:55 AM
maccoinnich maccoinnich is offline
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Location: Portland
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Burnside Bridge ideas narrowed to 4 options as county seeks ‘earthquake ready’ crossing

Multnomah County has narrowed its list of ideas for replacing or retrofitting the Burnside Bridge, a project it says is necessary to make sure at least one downtown Willamette River bridge could survive an earthquake, to four options.

According to a draft document published Aug. 31, the county wants to further study the following: Seismically retrofitting the 1926-era structure; building a new bridge without a lift span; replicating the drawbridge in the same height and location; or building a new drawbridge while splitting westbound traffic into a separate approach to address a growing bottleneck at Northeast Couch Street.

All of the options would cost more than $500 million to build. The Burnside Bridge was chosen as the best option to invest in because the street runs 17 miles in between Gresham and Washington County and could provide a significant life-line for the region if a Cascadia Subduction Zone rupture ravages the city.

According to the county, the current bridge is not expected to survive following a magnitude 8 or greater Cascadia Subduction Zone earthquake. A simulation of the expected earthquake destroying the bridge has been viewed in 96 countries and watched more than 74,000 times.
...continues at the Oregonian.
"Maybe to an architect, they might look suspicious, but to me, they just look like rocks"

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Old Posted Jun 16, 2020, 5:23 PM
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MarkDaMan MarkDaMan is offline
Join Date: May 2005
Location: Portland
Posts: 7,151

Burnside Bridge task force recommends 'long span' design, no temporary bridge
The Earthquake Ready Burnside Bridge task force looked at four types of bridges and has chosen the long span alternative for the replacement bridge.
Author: Jeff Thompson
Published: 9:27 AM PDT June 16, 2020
Updated: 9:51 AM PDT June 16, 2020

PORTLAND, Ore. — In the interest of making the upcoming Burnside Bridge replacement resilient to a major earthquake, a task force on Monday recommended moving forward with a long span bridge alternative.

The recommendation came after 18 months of work. The task force and a Multnomah County project team have met 16 times to discuss alternatives for the Earthquake Ready Burnside Bridge Project.

The long span bridge would replace the existing bridge in the same location and alignment, said Multnomah County spokesperson Mike Pullen.

"The long span alternative has the fewest support columns of four alternatives that were studied," Pullen explained. "Fewer columns avoids costly construction in geotechnical hazard zones near the Willamette River, and restricted spaces between lanes of Interstate 5 and the Union Pacific Railroad tracks on the east side."
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Old Posted Jun 29, 2020, 5:30 AM
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urbanlife urbanlife is offline
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Location: Milwaukie, Oregon
Posts: 11,285
Originally Posted by MarkDaMan View Post
That would be a drastic change to an iconic bridge. It will be interesting to see what this new era of the Burnside Bridge ends up looking like. Personally I am really excited to see what happens now that they seem to be set on the long span design, which did make the most sense for a number of reasons.
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