GENERAL INFORMATION: 503-823-7404
1120 SW Fifth Ave, Suite 600, Portland, OR 97204
In October 2012, a contractor for the Portland Water Bureau began preliminary work to construct a 1.3 million gallon water storage tank and a 1,408 square foot pump station. (November 2013 photo)
The 73-foot in diameter water tank will help to better serve the current and future water needs of residents living at higher elevations in the area and improve water capacity for emergency fire protection. (November 2013 photo)
The concrete cylindrical tank will be located underground on City property off NW Skyline Blvd. near NW Hawkins Blvd. Construction is slated for completion in March 2014. (November 2013 photo)
October 25, 2013
On Wednesday, August 21st, sub-contractor DN Tanks completed the steel cable wrapping and shotcrete application to the exterior of the Forest Park Low Tank Reservoir.
The next step in the process will be to apply a waterproof coating to the buried portion of the 1.3 million-gallon reinforced concrete reservoir.
Inside the tank, nine concrete columns support the roof of the reservoir. Each of the columns is 30” in diameter and about 40’ tall.
Soon, the reservoir interior will be disinfected and then the structure will be covered and compacted with layers of soil and eventually native grasses.
August 2, 2013
On Friday, July 26th, crews successfully completed a full-roof pour, capping off the 1.3 million-gallon concrete Forest Park Low Tank Reservoir. The new reservoir is part of an overall plan to increase water supply in the NW Portland Hills.
A vibrating device was utilized during the pour to remove any air bubbles that were present in the concrete. The concrete was continually smoothed using a concrete trowel.
The curing process included ensuring the newly poured roof slab was continually kept wet to control the evaporation of moisture from the surface. Over time, the concrete gradually produced a chemical reaction that hardened and set the concrete.
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.
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.
In October 2012, a contractor for the Portland Water Bureau began preliminary work to construct a 1.3 million gallon water storage tank and a 1,408 square foot pump station. The concrete cylindrical tank will be located underground on City property off NW Skyline Blvd. near NW Hawkins Blvd. Construction is slated for completion in March 2014. The Forest Park Low Tank Reservoir Project will safely place the 73-foot in diameter structure to a depth of approximately 41 feet. There will be no planned interruption of Portland Water Bureau customer’s water service during this work. After construction, the site will be replanted with native grasses. The tank is needed to better serve the current and future water needs of residents living at higher elevations in the area. It will also help to improve water capacity for emergency fire protection.
During construction, there will be intermittent street work to install pipes to connect to existing pipelines.
The work will affect the intersection of NW Skyline Blvd. at NW Hawkins Blvd. This work will require that traffic be channeled into one lane around the work zone from 9:00 AM to 3:00 PM. Electronic message signs will provide notice of the dates. Traffic will be managed through flaggers and safety barriers as required. All traffic lanes will be open when no work is underway. Motorists are encouraged to plan alternate routes to avoid delay.
There may be noticeable construction noise from heavy vehicles and machinery working on the bluff. There will be dump truck and cement mixer truck traffic on NW Skyline Blvd. Typically, work hours are 7:00 AM to 5:00 PM, Monday through Friday.
For information about this project, contact Lindsay Wochnick, Public Information, at 503-823-3028.
Thank you for your patience and cooperation as the Portland Water Bureau works to improve the city’s century old water system.