Wednesday - June 10, 2015

Pipeline activities underway on Mapleton Drive

This update includes information about the following topics:

  • Safety reminder – drive slowly and obey flagger directions
  • Highway 43 – final paving set to begin in July
  • Mapleton Drive – pipeline activities underway
  • Helpful guidelines - for Mapleton Drive pipeline construction
  • Neighborhood construction meetings - next meeting June 16

For the most up to date information on construction, follow @LOTwater on Twitter, visit work underway, or contact us.

Safety reminder

To maintain safety, please drive slowly in the work areas on Mapleton Drive and Highway 43, and obey flagger directions in all active construction zones. Crews have placed temporary speed bumps in the construction area at Trillium Creek on Mapleton Drive to encourage traffic to slow down.

Highway 43 – final paving set to begin in July

Final paving of the lane where the pipe has been installed is expected to begin in early July, starting at the intersection of Highway 43 and Mapleton Drive, and working north towards Lake Oswego. Striping will be placed shortly after the new pavement is installed. Paving is expected to continue through July, although this is weather dependent.

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. Neighbors can expect an increase in noise during paving.

Mapleton Drive - pipeline activities underway
Auger bore at Trillium Creek

Preliminary activities are underway to prepare for the auger bore (tunnel) under Trillium Creek on Mapleton Drive. Crews are almost finished installing “solider pile” shoring support for the tunnel work pit (pictured right). The pit will be used to tunnel the pipeline under the creek using an auger bore.

Over the next few days, steel plates will be installed in between the newly-placed piles to complete the support walls for the pit. During this work, nearby neighbors should expect an increase in noise and vibration.
Early next week, the work pit will be excavated and dirt removed. Mid-next week, after the pit is excavated, the tunneling subcontractor will mobilize equipment into the area, and begin tunneling and placing the pipe casing under the creek.

During the auger bore work at the creek, a single lane closure is in place with flaggers. Please expect some short-term, temporary delays to get through the work zone. Neighbors are encouraged to use Nixon Avenue to avoid traveling through the work area.

Sanitary sewer relocation

Starting late next week, the contractor will relocate a sanitary sewer line near 4020 Mapleton Drive. This 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. The sewer relocation is expected to take about two weeks to complete.

During this time, there will be a single lane closure with flaggers directing traffic. To maintain a single lane of traffic, the contractor will be adding gravel along the shoulders of the existing pavement near the sewer work to temporarily widen the road.

Please drive with caution when traveling through the active work zone and follow flaggers’ directions.

Restoration at the HDD site

Restoration work is almost complete at the horizontal directional drilling site at the end of Mapleton Drive. Landscapers expect to finish by the end of this week.

Open-cut pipeline work

Open-cut trenched pipeline work should begin sometime next month. Crews will 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.

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. In honor of Independence Day, there will be no work on Saturday, July 4.

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 sometime this summer.

Neighborhood construction meetings - next meeting June 16
The neighborhood construction meetings continue to be held twice a month.

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.

The next meeting will be June 16 at 6 p.m. at the Robinwood Station. Please attend to stay up-to-date on construction progress in West Linn and ask the project team questions.

For more information, please contact us or attend a neighborhood construction meeting.