Clackamas River trolley bridge tilting

The Old Trolley Bridge is in danger of collapsing on the Clackamas River, March 6, 2014 (KOIN 6 News)
The Old Trolley Bridge is in danger of collapsing on the Clackamas River, March 6, 2014 (KOIN 6 News)

PORTLAND, Ore. (KOIN) – The Old Trolley Bridge is in danger of collapsing at any time on the Clackamas River after engineers noticed “significant and alarming” movement Thursday morning.

Boaters were warned not to pass under the abandoned bridge between Gladstone and Oregon City after it began noticeably tilting.

The abandoned Old Trolley Bridge across the Clackamas River in Gladstone, Ore. The bridge's piling appeared to shift Thursday, March 6, 2014. (Clackamas County Sheriff's Office)
(Clackamas County Sheriff’s Office)

Crews working near the Old Trolley Bridge, about one mile upriver from the confluence with the Willamette River, observed its piling shifting. Within a few hours, the top of the piling had shifted 4 feet towards Oregon City, the Clackamas County Sheriff’s Office said.

County engineers brought in to examine the bridge assessed the “significant and alarming” movement, according to a sheriff’s office new release. There are significant stability concerns for the bridge.

The abandoned Old Trolley Bridge across the Clackamas River in Gladstone, Ore. The bridge's piling appeared to shift Thursday, March 6, 2014. (Clackamas County Sheriff's Office)
The abandoned Old Trolley Bridge across the Clackamas River in Gladstone, Ore. The bridge’s piling appeared to shift Thursday, March 6, 2014. (Clackamas County Sheriff’s Office)

Officials are advising boaters to avoid passing underneath the bridge. They should instead use boat launches at either the above Riverside Park or the below Meldrum Bar Park.

The bridge is an abandoned trolley line that was operated by the now-defunct Portland Traction Company that connected Oregon City with Portland in early 1900s. It is now owned by Union Pacific Railroad, whose engineers are evaluating the situation.

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