What is this Project?

This project increases system capacity to deliver high-quality drinking water from the Clackamas River to the communities of Lake Oswego and Tigard. Together these two communities can secure long-term access to clean, safe water for less than it would cost them to do it alone. Learn more...

Project News

Wednesday - April 23, 2014

Pipeline Construction Update: Mapleton Drive and Willamette River Crossing

The Lake Oswego Tigard Water Partnership would like to update West Linn neighbors with a few announcements of upcoming pipeline construction related activities at the horizontal directional drilling staging area for the Willamette River pipeline crossing, located at the end of Mapleton Drive, just north of Mary S. Young Park in West Linn.

  • The Partnership intends to issue a Limited Notice to Proceed with construction to Frank Coluccio Construction Co. in early May.
  • The contractor intends to start work on the horizontal directional drilling (HDD) pipeline first, with the remainder of Mapleton Drive pipeline work occurring sometime later this year or next year.
  • From June 2, the contractor will begin preliminary site preparation at the HDD staging area including mobilizing equipment, placing rock in preparation for the arrival of drilling equipment, installing security fencing and placing sound barriers.
  • The HDD pipe drilling will not occur until sometime in late July - early August.
  • The Partnership will hold a ‘Meet the Contractor’ open house in June. Stay tuned for more information about date, location and time. Please join us for this drop-in opportunity to meet the contractor, find out more about the construction process and ask questions.

Tuesday - April 22, 2014

Tigard’s underground ASR reservoirs store water, save money

Tigard has been buying its drinking water from Portland since incorporating as a city in 1961. In 2016, Tigard will join Lake Oswego in receiving drinking water from the Clackamas River.  The communities are working together to ensure customers have enough water when they need it, year round.


Monday - April 21, 2014

Neighborhood WTP Construction Update Meeting: Next Meeting 5/6 at 7:30 a.m.

The 16th bi-monthly water treatment plant neighborhood construction update meeting was held on Tuesday, April 15, at Burgerville in West Linn. Neighbors learned about upcoming construction and asked questions of the project team. All meeting materials are available on the project website under the ‘Past Public Meetings’ page here. A link to the April 15 meeting summary, including discussion and action items can be found here.


Friday - April 11, 2014

Pipeline Construction Update - Lake Oswego

Pipeline installation along Douglas Circle

This update includes construction work in the following areas. Scroll down for specific information on each

  • Lanewood Street
  • Douglas Circle
  • Twin Fir Road
  • Upper Drive
  • Chandler Road
  • Iron Mountain Boulevard
  • B Ave

For the most up to date information on construction and road closures, please visit work underway, call the
hotline on 503-697-6502 or contact us.


Friday - April 11, 2014

Water Treatment Plant Construction Update

Tying rebar and preparing for a concrete pour in the gravity thickener

The auger cast drill rig is continuing to drill piles for all new structures on site, including the mechanical dewatering building and electrical building - over half of the 1,100 auger cast piles have been installed to date!

Last week, work started on backfilling the access ramps into the south side of the clearwell near Mapleton Drive. The backfilling activity requires loaders to pick up and place gravel and rock, and then use a rolling vibratory compactor to compress the fill and gravel. The compaction in this area, and the northeast of the site close to the demolished lagoons will continue intermittently over the next few weeks. Form work and concrete pouring will also continue on-site over the next few weeks, for the clearwell and ballasted flocculation columns, walls and suspended roof.

Neighbors can expect some noise and potential vibration during the fill placement and compaction, auger cast drilling and concrete sandblasting, depending on locations or personal sensitivities. Truck traffic will continue during concrete and grout pouring for the auger cast piles and new foundations.

Work hours are Monday to Friday from 7:00 a.m. to 7:00 p.m. and Saturdays, from 9:00 a.m. to 5:00 p.m. There will be no work on Saturday, April 26.

For more detail about what activities are happening on site please see the table below.

We apologize for the inconvenience construction may cause and thank you for your patience as work progresses.

For more information, please contact us or call the hotline at 503-697-6502.

Construction Tour Reminder

The Partnership holds free WTP construction tours on the fourth Thursday of each month at 10:00 a.m. The next tour will take place on April 24. Space is limited so please sign-up in advance to register a spot by contacting us, calling the hotline or in person at the bi-monthly meetings.