Tuesday - May 19, 2015

Crews to Begin Tunneling Under Railroad Tracks on Bonita Road for Water Pipeline

Released May 18, 2015

Beginning next week, crews will start excavating and constructing an entry shaft in the center lane of Bonita Road, near 74th Avenue, for a tunnel underneath the railroad tracks. Once complete, a new waterline will be installed through the tunnel.

This deep shaft will be present 24 hours a day, seven days a week for about two months. Crews will install concrete barriers and other traffic control devices to safely guide traffic around the construction site. The site will also house a large crane and excavator. Active work hours at the shaft are 8 p.m. to 5 a.m., Monday through Friday.

While the shaft is in place, no left turns will be permitted from 74th Avenue onto Bonita Road. Two-way traffic on Bonita Road will be maintained.

This work is a key component to the construction of approximately 3,000 feet of water pipeline along Bonita Road, between Milton Court and Bangy Road. This pipeline will connect Tigard’s new Bonita Pump Station to the water system in Lake Oswego.

Crews have already begun construction activities along the pipeline alignment and are currently installing pipe just past 72nd Avenue working towards the temporary staging area at Sequoia Parkway.
Last week, crews completed the process of tunneling under I-5 and installed the pipeline from the area near Paul Schatz Furniture Store in Tigard, to the area near Ethan Allen in Lake Oswego, just off Bangy Road. To minimize traffic impacts, portions of the water pipeline in Bonita Road are being installed at night, from 8 p.m. to 5 a.m., Sunday through Thursday

During construction, commuters can expect to see and hear excavators, loaders, pipe, steel plates, gravel and dump trucks. Equipment will be stored in the right-of-way, along the shoulders of Bonita Road and at the temporary staging area at Sequoia Parkway. Final paving will occur after the pipe is tested and disinfected, likely in fall 2015.

The cities of Tigard and Lake Oswego formed a partnership in 2008 to share the costs of upgrading Lake Oswego’s water infrastructure and share high-quality drinking water year-round. These water pipelines connect Tigard with Lake Oswego’s water system and serve both communities. Other partnership facilities under construction include a new river intake pump station on the Clackamas River in Gladstone, a new state-of-the-art water treatment plant in West Linn, a new 3.5 million gallon water storage reservoir in Lake Oswego, a new pump station on Milton Court in Tigard and more than ten miles of new large-diameter water transmission mains connecting all these facilities. These critical water supply systems have been designed to remain operable even when subjected to a large earthquake and to allow water to move from Tigard to Lake Oswego, further enhancing resiliency in emergencies.

For the most up-to-date construction information, sign up to the “water pipelines in Tigard” email list or visit the project website at www.lotigardwater.org, email lotwater@ci.oswego.or.us, follow @LOTWater on Twitter, or call the project hotline at 503-697-6502.