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 University Bridge - Seattle, WA
N 47° 39.164 W 122° 19.221
10T E 551038 N 5277927
University Bridge, a bascule bridge erected in 1919, spans Lake Union Canal and was listed in the National Register of Historic Places in 1982.
Waymark Code: WMWBXH
Location: Washington, United States
Date Posted: 08/10/2017
Views: 2
A very nice article from Historylink.org highlights this bridge and reads:
On July 1, 1919, the University Bridge, which connects Seattle's University District with Eastlake, is dedicated and opens to traffic. The bascule bridge crosses Lake Union where the lake connects with Portage Bay.
A bascule bridge is a drawbridge that operates like a teeter-totter. As the bridge span rises, its counterweight lowers, and as the span lowers the counterweight rises.
During 1932 and 1933, the University Bridge was reconstructed. The timber trestles were replaced with approaches of concrete and steel; the wooden block paving on the deck was replaced with an Irving Open Mesh steel deck, two additional lanes were constructed on the lift span, and the control towers were rebuilt. The reconstructed bridge was re-opened to traffic on April 7, 1933.
New Technology Saves Lives
The use of open steel-mesh grating on the University Bridge was the first use of this technology in the United States. Steel-mesh grating (invented by Walter F. Irving, of the Subway Grating Co. of Long Island, New York), represented a tremendous improvement over timbered bridges. It made the bridge spans lighter and easier to raise and lower. It was safe for horses and cattle (a concern in 1933). Its open-mesh design lets wind through during gales and reduces the chances of the bridge blowing down. It does not have to be replaced every 10 years, as did the surfaces of timber bridges. The steel mesh on University Bridge was replaced once, in 1990.
The steel-mesh is not as slippery as wood in wet weather. In his history of Northwest technology, Adam Woog notes that before the steel-mesh surface was installed, the University Bridge averaged 182 accidents and 6 deaths annually. No deaths or accidents due to a slippery surface have been recorded since the installation of steel-mesh grating.
This bridge looks very similar to another bascule bridge, the Ballard Bridge located west of here. Visit Instructions:
To post a visit log to this waymark you need to visit and write about the actual physical location. Any pictures you take at the location would be great, as well.
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