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Up Next for the Forest Park Reservoir Construction: Concrete Roof Pour & Post-Tensioning

By Lindsay Wochnick 7 Comments

In October 2012, a contractor for the Portland Water Bureau began work to construct a 1.3 million gallon underground drinking water reservoir and a 1,408 square-foot pump station. The reinforced concrete cylindrical tank is located on City property off NW Skyline Boulevard, near NW Hawkins Boulevard.

Continuing tank lid form support joist and sheeting install
 

Identified in the city’s water system as the Forest Park Low Reservoir, the 73-foot diameter structure has quickly taken shape. In eight months, the outside walls and concrete floor of the reservoir were poured and the nine interior columns cast and in place, ready to support the roof. Once the reservoir construction is completed, native grasses will be planted that will cover the structure.

 
 

During the rest of July, crews will conduct the first phase of wall “tendon post-tensioning.”  Post-tensioning is a method of reinforcing and strengthening concrete with high-strength steel strands or bars, typically referred to as tendons. 

Forest Park Low Tank Reservoir - July 2013

Following the post-tensioning work, crews will pour the reservoir’s roof, scheduled for Friday, July 26.  Because of the forecasted heat and the need to allow the 230 yards of concrete roof to efficiently cure, the pour will begin early that morning, with preparations starting at 5:00 am.

Later this summer, crews will be constructing the adjacent pump station.

To learn more about the Forest Park Low Tank Reservoir, please visit the project webpage.

Lindsay Wochnick
Community Information & Involvement

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