Tag Archives: narrows

Tacoma Narrows Bridges

Ask any engineering student about famous bridges and the Tacoma Narrows has a great chance of coming up.  The original bridge failed pretty spectacularly due to aeroelastic issues.  It was replaced and the bridge has stood since without significant issues other than overcrowding.  Consequently, a second Bridge was added a few years ago.  The pair span the narrows and provide a roadway for the busy local traffic.

The hike around Point Defiance Park takes you out onto the overlooks the narrows and, as you move along the trail, you get differing views of the bridges.  The further south you get in the park, the clearer the view is of the whole span.  I grabbed a few shots of the water and the bridges and also shot some closer shots to make a pano when I got home.

Tacoma Narrows Bridge

wpid10997-AU0E6747.jpgAny engineering student will be familiar with the Tacoma Narrows Bridge. Built in the early part of the twentieth century, this bridge was susceptible to wind induced oscillations which, in certain conditions could set up a resonance condition. Not too long after it was completed, this got out of hand and the bridge bucked and twisted in dramatic fashion until the materials could take it no longer and the structure disintegrated crashing down into the water below. If you want to see this because you are unfamiliar with it (or because it never gets old watching it), the video below will show you what happened.

https://www.youtube.com/watch?v=j-zczJXSxnw

The bridge was rebuilt and has lasted since that day although it could no longer manage the volumes of traffic so was joined by a second bridge alongside it relatively recently. I have been over both bridges. However, as we flew past Tacoma, I could see them off in the distance. No great architectural photos here but just something for you engineers out there!