Thursday - July 9, 2015

Trillium Creek tunneling complete

Crews begin grinding a 4-inch deep section of pavement on Hwy. 43 prior to placing new asphalt.

Crews push the last piece of pipe casing through the work pit.

The casing emerges on the other side of Trillium Creek.

West Linn Pipeline Construction Update - Highway 43 and Mapleton Drive

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

  • West Linn emergency intertie connection – complete and fully operational!
  • Highway 43 – final paving over halfway complete
  • Mapleton Drive – auger bore complete, sewer relocation to begin
  • Neighborhood construction meetings - next meeting July 21

West Linn emergency intertie connection - complete and fully operational!

As part of construction of the Partnership’s new water pipeline in West Linn, an important connection from the new pipeline on Highway 43 to West Linn’s emergency intertie pump station at Old River Road was recently installed. This intertie came in handy over this past long—and hot—weekend. During a major water main break in West Linn, Lake Oswego’s water treatment plant provided an emergency backup supply to West Linn residents and businesses through the new intertie connection. Plant staff operated on extended shifts to produce an additional 1 million gallons of water for West Linn. This intertie is a crucial public health and safety benefit for our cities and the region.

Highway 43 – final paving over halfway complete

Final paving of the lane where the pipe has been installed on Highway 43 is over halfway complete! Crews are working north towards Laurel Street in Lake Oswego and have currently paved just passed Holy Names Drive.

Paving is expected to continue through next week. Traffic loops at the signaled intersections on Highway 43, between Hidden Springs Road and Furman Drive, will be placed next week. Final striping will be placed in late July through mid-August, after the new pavement is installed.

Nighttime work hours on Highway 43 are 8 p.m. – 5 a.m., Sunday through Thursday. During work hours, one lane will be open at a time, in most areas, with flaggers guiding traffic in each direction. No traffic will be allowed to drive on the new asphalt until it has completely cooled. Neighbors can expect an increase in noise during paving.

Please drive safely through the work areas and the temporary milled pavement portions on Highway 43. Thank you to businesses, neighbors and commuters for your patience during the paving and restoration work!

Mapleton Drive pipeline activities

Auger bore at Trillium Creek - complete

Late last week, the tunneling subcontractor finished pushing the final piece of the pipe casing through the tunnel under Trillium Creek, completing the auger bore!

The work pit where the tunneling equipment was located will remain intact, covered with steel plates in the roadway to keep the pit secure and drivable until crews return to install the remainder of the large water pipe on Mapleton Drive.

Sanitary sewer relocation - preparation work to begin next week

Crews are planning to start relocating the sanitary sewer line near 4020 Mapleton Drive the week of July 20, however, schedules are subject to change. The sewer relocation involves digging in the road and installing a new sanitary sewer line. To avoid service interruptions, the contractor will use a temporary bypass during the work.

To prepare for the sewer relocation work, late next week crews will mobilize equipment in the right-of-way on Mapleton Drive, set up the temporary storage area on the south side of the plant site, and place tree protection fencing in the active work area. To maintain a single lane of traffic, the contractor will also add gravel along the shoulders of the existing pavement near the sewer work, to temporarily widen the road.

Early next week, crews will also trim some remaining tree branches overhanging in the right-of-way, to prepare for the open-cut pipeline work.

The sewer relocation work is expected to take up to two weeks to complete. During this time, there will be a single lane closure with flaggers directing traffic. Please expect some short-term, temporary delays to get through the work zone. Please drive with caution when traveling through the active work zone and follow flaggers’ directions. Neighbors are encouraged to use Nixon Avenue to avoid traveling through the work area.

Open-cut pipeline work

Open-cut, trenched pipeline work is expected to begin in late July, after the sewer line is relocated, however, schedules are subject to change. Crews plan to start at the eastern end of Mapleton Drive, working toward Nixon Avenue.

Once crews work past the Nixon Avenue and Mapleton Drive intersection, a detour will be in place during work hours. During construction hours, residents located east of the active work zone will need to use the detour route on Nixon Ave and Cedaroak Drive.

Work hours and what to expect

Work hours on Mapleton Drive are Monday to Friday, 7 a.m. - 7 p.m. and Saturdays, 9 a.m. - 5 p.m.

Neighbors can expect to see and hear excavators, generators, loaders, saw-cutters, compressors, pipe, steel plates, gravel and dump trucks in the work area and right-of-way. During work hours, there can be an increase in noise, truck traffic and vibration, depending on neighbors’ locations.

Helpful guidelines

Questions about pipeline construction on Mapleton Drive? Check out these helpful guidelines that were developed in collaboration with a taskforce of neighbors, City of West Linn councilors and staff, TVF&R, Partnership staff and contractor representatives. The guidelines also include a map of the detour route that will be in place soon.

Neighborhood construction meetings - next meeting July 21

The next neighborhood meeting will be held at Robinwood Station on July 21 at 6 p.m., in the downstairs restaurant area. Please attend to stay up-to-date on construction progress in West Linn and ask the project team questions.

Meeting schedule:

  • The first Tuesday of the month at 7:30 a.m., at Burgerville, 18350 Willamette Drive, West Linn.
  • The third Tuesday of the month at 6 p.m., at the Robinwood Station, 3706 Cedar Oak Drive, West Linn.

For the latest information, follow @LOTWater on Twitter. You can also drop-in to a neighborhood construction meeting or contact us.