Raw Water Pipeline

Facility Description

Water collected from the Clackamas River travels through approximately 14,000 feet of pipe from Gladstone, under the Willamette River to the Water Treatment Plant in West Linn. The existing pipe is 27 inches in diameter. It has been in operation for nearly 45 years.

A new drinking water pipeline will be constructed to connect the Partnership’s water intake (in Gladstone) with the water treatment plant (in West Linn). Construction of the new drinking water pipeline is scheduled to take eighteen months.

Lake Oswego’s new 42-inch-diameter pipe will carry up to 38 million gallons of water per day.

Frequently Asked Questions

How will access to neighborhood streets be maintained? Garbage collected? What about emergency vehicles? Residential streets and driveway access will be reestablished at the end of each work day. The contractor will work with residents to make sure garbage can be removed.

Access for emergency vehicles will be maintained at all times.  Construction plans will be coordinated with fire, police and ambulance services.

Where can neighbors park during construction? During pipeline construction there may be occasions when residents may need to park elsewhere for short periods of time. Visitors and delivery vehicles may need to park outside the work zone during work hours.  The Partnership is committed to providing neighbors with advance notice during periods of restricted vehicle access.  

How long will pipeline construction be in one area? We anticipate that the work zone will move about 50 to 100 feet each full work day.   A typical work zone will be about 100 to 130 feet long. 

When will work occur? We expect to work between 7a.m. and 7p.m.

How deep will the new pipeline be? The top of the pipe will be 4 to 8 feet beneath the road surface.

Will the street be returned to its existing condition? Streets damaged by project construction will be improved to meet Gladstone standards.  In most cases, streets will be left in better condition than before pipeline construction.

The new water pipeline will travel under the roadway from Lake Oswego’s water intake through Meldrum Bar Park, under the Willamette River, to the water treatment plant in West Linn.

Gladstone Open House

The Lake Oswego Tigard Water Partnership hosted an open house on March 22, 2012 to consult with Gladstone residents and business owners about construction of a raw (untreated) water pipline through Gladstone. The meeting was held at the Gladstone Senior Center. Click here to read a summary of the Open House.

How to Get Involved

Look Ahead: 

You can find regular updates on the Work Underway page.

Field Updates

Thursday - June 16, 2016

Restoration activities taking place in Lake Oswego

Iron Mountain staging yard.

Lake Oswego Pipeline Construction: Restoration Update

Iron Mountain Boulevard Staging Yard – restoration almost complete

The contractor has been working to restore the Iron Mountain staging yard. This includes removing the rock (gravel) and geotechnical fabric that was placed, mulching, seeding and installing temporary irrigation to help stabilize the seeding. Once the restoration is complete, a third party erosion control inspector will inspect the site to ensure restoration is in compliance with the permit.

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Monday - February 29, 2016

Bonita Road Pipeline Work near Fanno Creek begins March 7

Starting next week, crews will be working on a water pipeline located on Bonita Road, near Fanno Creek, next to the Bonita Villa Apartments. This work involves reconfiguring a portion of existing pipelines, to enable Tigard’s new Bonita Pump Station to be brought completely online.

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Friday - December 18, 2015

Raw water pipe in service next week!

Crews place the carrier pipe in the casing, and prepare to fill the pipe casing with sand.

Crews successfully connected the raw water pipe to the plant.

West Linn Pipeline Construction Update: Mapleton Drive

This update includes information about the following topics. Read more for specific information on each topic:

  • Work hours
  • Trillium Creek Tunnel - pipe installed, work pits backfilled
  • Raw water pipe in service next week!
  • Temporary pavement and cleanup work
  • Finished water pipe installation resumes Jan. 4
  • Neighborhood construction meetings

Read More