Sinkhole on 46th Avenue in Portland, Oregon

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Sinkhole on 46th Avenue in Portland, Oregon

Postby David Owen » Thu May 09, 2013 7:37 pm

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Photo: David Owen/ Artifice Images (creative commons attribution)

A sink hole spontaneously developed in the 1700-block of 46th Avenue in Portland, Oregon on Thursday, May 9. The exposed hole, which seemed to offer views into a much larger cavity, at least several feet deep, developed sometime before 4PM in the middle of the block between NE Broadway and NE Hancock streets.

As of around 4PM Portland Police were on the scene and had erected a cordon around the immediate vicinity of the hole. Police cars and tape were also blocking access to 46th at its intersections with Broadway and Hancock.

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Photo: David Owen/ Artifice Images (creative commons attribution)

Image
Photo: David Owen/ Artifice Images (creative commons attribution)
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Re: Sinkhole on 46th Avenue in Portland, Oregon

Postby David Owen » Fri May 10, 2013 1:05 pm

City of Portland utility workers report that the sinkhole is the result of erosion caused by of a ruptured sewer line. In the morning of May 10, crews were working to clear the line of debris to make room for remote inspection of the sewer line using a telescoping camera unit.
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Re: Sinkhole on 46th Avenue in Portland, Oregon

Postby WalkerARCHITECTS » Sun May 12, 2013 12:48 am

Quite a hole.
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Re: Sinkhole on 46th Avenue in Portland, Oregon

Postby phansford » Mon May 27, 2013 7:23 am

David - I'd be interested to know if this event encouraged the City to review other areas for potential problems. Most cities now have sophisticated monitoring systems that alert them of leaks or pressure losses for their water supply system, not sure there is anyway to do the same for the sanitary system other than running cameras on the lines.
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Re: Sinkhole on 46th Avenue in Portland, Oregon

Postby Helenni » Tue May 28, 2013 5:51 am

dangerous , sorry to hear that .


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Re: Sinkhole on 46th Avenue in Portland, Oregon

Postby David Owen » Thu May 30, 2013 2:54 pm

Phansford, that's exactly what happened! They had a team with a large vacuum truck sucking out the sanitary line through a manhole cover on one side of the sinkhole. While from the other side, they had a camera truck doing remote observation of the line.

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A vacuum truck cleans out the sanitary line. Photo: David Owen/Artifice Images


ImageWorkers initially blocked access to the street. Photo: David Owen/Artifice Images

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Following initial excavation, while remote observation was under way, steel plates were installed over the hole. Photo: David Owen/Artifice Images
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Re: Sinkhole on 46th Avenue in Portland, Oregon

Postby phansford » Fri May 31, 2013 7:43 am

David, Thanks for the update.

This ties into the issue of the nation's infrastructure. We have 100 year old plus water, storm, and sanitary systems throughout the country. Just as bridges and highways are important to the safety of personal travel and business health, so are these systems. Many industries relies on clean plentiful water (Beer brewing being the most important :lol: ) and reliable sanitary systems for waster removal.

We seem to be reactive rather than proactive in the care and feeding of infrastructure. It also doesn't help when communities compete for these industries and provide tax incentives that only hinder maintenance of our infrastructure.
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