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Portland Water Bureau

From forest to faucet, we deliver the best drinking water in the world.

GENERAL INFORMATION: 503-823-7404

1120 SW Fifth Ave, Suite 600, Portland, OR 97204

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Forest Park Low Tank Reservoir Project

  • Forest Park Low Tank Reservoir Project

    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. (July 2014 photo)

  • Meeting Future Water Needs

    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. (July 2014 photo)

  • Improving the City’s Century Old Water System

    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 July 2014. (July 2014 photo)

PROJECT UPDATES

August 15, 2014
PROJECT COMPLETE
The 1.3-million gallon reinforced-concrete underground drinking water reservoir, located on City property off NW Skyline Boulevard near NW Hawkins Boulevard, is now connected to the live water system and fully operational.

The newly-completed Forest Park Low Reservoir will provide additional storage and serve customers in the Northwest Hills service areas. Alongside the Mt. Calvary and Greenleaf Tanks, the Forest Park Low Reservoir will strengthen the overall supply system in the Northwest Hills, offering more operational flexibility and a better ability to meet peak day and fire flow demands now and in the future.

July 21, 2014
**RESCHEDULED DUE TO WEATHER**
Section of NW Skyline Boulevard Reduced to One Lane for Paving During Week of July 21, Expect Delays


The Portland Water Bureau will be alternating the closure of the west and eastbound lanes of NW Skyline Boulevard, between NW Hawkins Boulevard and NW Cornell Road, from 7 a.m. to 6 p.m. on Wednesday, July 23 through Thursday, July 24. The alternating lane closure will allow crews to repave about 150-feet of roadway at the NW Hawkins and NW Skyline boulevards intersection. All traffic lanes will reopen when the work day ends.

WHAT YOU NEED TO KNOW:

  • Flaggers will be stationed to pass traffic through safely.
  • Motorists may experience a 15- to 20-minute delay.
  • Motorists are asked to stay alert and use caution as traffic may suddenly stop.
  • To avoid traffic delays, motorists should use alternate routes around the work site.

In May, the Water Bureau excavated a space under the westbound lane of NW Skyline Boulevard to connect a pipeline from the newly constructed Forest Park Low Reservoir to the water system.  The final step in the process to restore the roadway will be to repave the NW Hawkins intersection from curb to curb.

July 18, 2014 
In October 2012, contractor Emery & Sons Construction, Inc. began work with oversight from the Portland Water Bureau’s Engineering Services Group to construct the Forest Park Low Reservoir, a 1.3-million gallon reinforced-concrete underground drinking water reservoir and an adjacent 1,408 square-foot pump station on City property off NW Skyline Boulevard, near NW Hawkins Boulevard.

In just under two years, the project is nearing completion.  By the end of July, the reservoir will be connected to the live water system and fully operational. Take a look back at all the progress!

June 5, 2014 

Aerial View of Forest Park Low Reservoir & Pump Station (May 2014) Aerial View of Forest Park Low Reservoir & Pump Station (May 2014)

The Portland Water Bureau’s Forest Park Low Reservoir construction project to build a 1.3-million gallon reinforced-concrete underground drinking water reservoir and a 1,408 square-foot pump station in northwest Portland is close to completion. 

Reservoir
Crews are backfilling the 73-foot in diameter reservoir ensuring that if settling does occur, the foundation soil grade does not shift any locations. Within a month’s time, the reservoir will disappear from sight, being covered and compacted with layers of soil and eventually native grasses.

Concurrent with the backfill process work, the reservoir is in the process of being filled with water and will soon be connected to the water system.  The reservoir will is slated to serve the current and future needs of the residents living at higher elevations in the area and improve water capacity for emergency fire protection.

Forest Park Low Reservoir & Pump Station
Forest Park Low Reservoir & Pump Station (May 2014)

Pump Station
The build of the adjacent pump station is almost finished as well.  The structure has a green metal roof and cinderblock walls and foundation, making the station durable, energy efficient and insulated against cold and heat.

Road Repave & Restoration
In May 2014, the Water Bureau excavated a space under the westbound lane of NW Skyline Boulevard to connect a pipeline from the reservoir to the water system.  In mid-June, crews will repave and restore that patch of the city street.

May 16, 2014
Two-Day Pipe Connection Project on NW Hawkins Boulevard Scheduled for the Week of May 19: During the week of May 19, 2014, a contractor for the Portland Water Bureau is scheduled to complete a two-day pipe project on NW Hawkins Boulevard, west of NW Skyline Boulevard, weather depending.

DETAILS:
The project will include excavating down into the street in order to make a pipe connection by the curb in the 8000 block ofNW Hawkins Boulevard. In order to complete this work, the contractor will need to temporarily block access during work hours in and out of the residence’s driveway at 8026 NW Hawkins Boulevard for up to two days. The resident will be asked to park on the street during the day but will be able to access the driveway after work hours.

Crews are scheduled to work on this project from 8:00 am to 4:00 pm. Residents immediately adjacent to the project work will be notified during the week of May 19 as to what day exactly the project is set to begin.

WHAT YOU NEED TO KNOW:
*  During non-work hours, crews will place a temporary steel road plate over the work.
*  After the pipe connection is made, street paving and restoration will occur.
*  No other access into residences’ driveways in the area will be affected during this project.
*  Residents are encouraged to allow for extra travel time and drive cautiously through the work zone.

May 15, 2014
Traffic Advisory for Travelers on NW Skyline Boulevard: A short stretch of NW Skyline Boulevard near NW Hawkins Street will be reduced to one-lane of alternating traffic starting Monday, May 19 through Wednesday, May 28, 2014, from 7:00 am to 5:00 pm. Both traffic lanes will reopen when the work day ends.

WHY?
The Water Bureau will be excavating a space under the westbound lane of NW Skyline Boulevard and then connecting a pipeline from the newly-constructed Forest Park Low Reservoir to the water system. The pipe connection is part of the Water Bureau’s project to add a new 1.3 million gallon underground reservoir to better serve the current and future water needs of residents living at higher elevations in the Northwest Hills district. It will also help to improve water capacity for emergency fire protection.

WHAT YOU NEED TO KNOW:
* Flaggers will be stationed to pass traffic through safely.
* Motorists may experience a five to 10 minute delay
* Stay alert and use caution as traffic may suddenly stop.
* Alternate routes are encouraged for motorists to avoid traffic delays.

April 29, 2014

Aerial photos of worksite from February 2013 to January 2014
Aerial photos of work site from February 2013 to January 2014

The intricate system of piping running from the tank and connecting to the water main under NW Skyline Boulevard has been installed. The pipelines will soon undergo pressure testing to ensure the integrity and soundness of the pipes and joints within the pipeline. The walls and floor of the pump station have been constructed. Using gravel, crews have backfilled around the rectangular-shaped pump station. The project is scheduled for completion in late May 2014.

February 26, 2014
The Portland Water Bureau’s construction project to build a 1.3-million gallon reinforced-concrete underground drinking water reservoir and a 1,408 square-foot pump station in northwest Portland was previously slated for completion in March 2014.  

Due to inclement weather in December 2013 and January 2014, the project was slightly delayed and is now expected to be complete in May 2014, under normal weather conditions.

Currently, crews are working to backfill the reservoir, built 41-feet into the ground, and the adjacent pump station. Soon, the reservoir will be covered and compacted with layers of soil and eventually native grasses. For the remainder of the project, the Water Bureau does not anticipate impacts or disruptions to traffic on NW Skyline Boulevard.

January 17, 2014

January 2013 aerial photo of worksite January 2013 aerial photo of worksite

Just over a year ago in October 2012, contractor Emery & Sons Construction, Inc. began work with oversight from the Portland Water Bureau’s Engineering Services Group to construct a 1.3-million gallon reinforced-concrete underground drinking water reservoir and a 1,408 square-foot pump station on City property off NW Skyline Boulevard, near NW Hawkins Boulevard.
Identified in the city’s water system as the Forest Park Low Reservoir, the 73-foot diameter reservoir and adjacent pump station are part of an overall plan 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.

January 2014 aerial photo of worksite 

January 2014 aerial photo of worksite

In the past 12 months, crews have made significant progress, completing on schedule the following phases of construction:

  • Clearing and grubbing the site
  • Building a maintenance access road
  • Excavating the site for the reservoir and pump station
  • Drilling and grouting 320 soil nails to stabilize the soil slope
  • Installing a detention vault that will assist in managing excess water runoff
  • Pouring the reservoir floor and 50-foot tall walls
  • Pouring the nine interior columns to support the roof
  • Reinforcing the reservoir walls with a tensioned wrap of steel cable
  • Applying shotcrete to the exterior of the reservoir
  • Pouring the reservoir roof
  • Installing an underground vault that houses electrical facilities to power the reservoir
  • Testing reservoir for water tightness

Backfilling around tank

Currently, crews are working to backfill the reservoir which was built 41-feet into the ground. They are also constructing the neighboring 1,408 square foot pump station, already completing the excavation and form placement and working to now complete floor and wall pours for the structure. The project is on track for full completion in May/June 2014. 

October 25, 2013
Traffic Advisory: A short stretch of NW Skyline Boulevard near NW Hawkins Street will be reduced to one lane of alternating traffic from Tuesday, October 29 through Wednesday, October 30, 2013, from 7:00 am to 5:00 pm. Both traffic lanes will reopen when the work day ends.

The Portland Water Bureau will be repaving a one-fourth mile stretch of road beginning at NW Hawkins Boulevardand down the hill on NW Skyline Boulevard to the NW Cornell Road intersection. 

Flaggers will be stationed to pass traffic through safely. Motorists are reminded to stay alert and use caution as traffic may suddenly stop. Alternate routes are encouraged for motorist to avoid traffic delays. This asphalt paving work requires dry weather. The work will be re-scheduled under wet conditions.

August 21, 2013

Cable wrapping machine

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.

Tension wrapping on the tank wall is completed

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.

The reservoir will be filled to full capacity with water next month to visually inspect for leaks at the base of the structure.  

Take a Look Inside!

The temporary stair access scaffold

Inside the tank, nine concrete columns support the roof of the reservoir. Each of the columns is 30” in diameter and about 40’ tall.

The interior tank lid after stripping and shoring removal  The permanent stair landing ledge and pedestal

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 8, 2013
On July 26th, Emery & Sons Construction, Inc completed a full-roof pour in less than three hours, capping the 1.3 million-gallon concrete Forest Park Low Tank Reservoir. The new reservoir is part of an overall plan to increase water supply especially for fire protection in the Northwest Portland Hills. 

Beginning Monday, August 12th, equipment will mobilize at the construction site and crews will begin preparing the concrete tank to be reinforced with a tensioned wrap of steel cable. 

Starting on Friday, August 16th and continuing on Monday, August 19th, more than 10 miles of cable will be used to wrap the reservoir. The cable will then be covered with a layer of sprayed-on concrete applied through a hose at high velocity. 

The steel cable wrapping will serve as a multi-layered encasing that adds support and reinforces the reservoir’s walls. Wrapping will be one of the last parts of the tank construction process. The next steps include backfilling the reservoir, water testing and building the adjacent pump station. The project is on-track for completion in May/June 2014. 

During the cable wrapping process, residents are reminded to be cautious of the construction zone area. 

Beginning of the tank lid pour

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.

Crews overseen by Emery & Sons Construction started work early due to projected high temperatures. Using a crane, 230 yards of concrete mixture was pumped, poured and spread through the framework of the 79.5 foot-diameter circular roof.

Surface finishing of the tank lid

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.

After the concrete was placed and smoothed, crews worked against time and the hot weather to maintain a satisfactory moisture content and temperature. This process, known as curing, is vital to quality concrete.

Water curing the tank lid with rain birds

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.

The next steps in the project include external cable wrapping, backfilling the reservoir, water testing and building the adjacent pump station. The project is on-track for completion in May/June 2014.

July 22, 2013
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.

July 18, 2013
The Portland Water Bureau and Emery & Sons Construction, Inc are making some minor schedule changes as the summer weather pattern continues to bring hot weather that impacts pouring concrete. The construction of the new 1.3 million gallon water reservoir on City property off NW Skyline Boulevard near NW Hawkins Boulevard requires large quantities of concrete that is sensitive to temperature and humidity.

As a result of hot summer temperatures, concrete work to pour the roof of the reservoir will start at 5:00 am from Friday, July 26 to Wednesday, July 31, 2013. The Portland Water Bureau and Emery & Sons Construction, Inc thank you for your help and cooperation in keeping the project on schedule.

May 29, 2013
Due to rainy weather conditions, the paving project on NW Hawkins Blvd.scheduled for the week of May 27, 2013 has been rescheduled to occur during the week of June 10, 2013. The paving will replace a temporary asphalt patch that was applied to the street after new water mains and sewer pipes were installed in 2012.

Crews will be working from 8:00 am to 5:00 pm over the course of one to two days, dependent on weather conditions. In order to complete this work, the contractor will limit street parking and conduct temporary roadway closures on NW Hawkins Blvd.(maintaining local and emergency vehicle access).

There will be signed detours and flaggers to assist drivers and pedestrians through the area and residents should allow for extra travel time when driving through the work zone.

The paving project may again be postponed due to inclement weather.

October 15, 2012
Water work to impact short section of NW Hawkins Boulevard: Starting October 18, 2012, a contractor for the Portland Water Bureau will be installing water and sewer pipelines in a 500 foot section of NW Hawkins Boulevard. The work will require that access off of NW Skyline Boulevard be closed. Traffic onto NW Hawkins Boulevard will be detoured to the next street. Crews will work in several sites along NW Hawkins Boulevard at different time over the coming months.

Also, intermittently, over the coming months, traffic on NW Skyline Boulevard will be flagged a work zone. The contractor will be installing two new manholes and water and sewer pipe. To accommodate rush hour traffic, the lane closure will only be from 9:00 AM to 3:00 PM, Monday through Friday.  Flaggers will safely direct traffic past the work zone. All traffic lanes will be open when no work is underway.  Motorists and bicyclists are encouraged to find alternate routes to avoid possible delays. Future intermittent lane closures will occur through to May/June 2014. Electronic message signs will provide advanced notice of the dates.

Project Background
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 May/June 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.

Public Impacts
During construction, there will be intermittent street work to install pipes to connect to existing pipelines.

Traffic Management
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.

Work Hours
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.

Additional Information
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.