Monday - April 20, 2015

Major Water Pipeline Construction Along Bonita Road in Tigard Begins at the End of April

This month, crews will begin construction of approximately 3,000 feet of water pipeline along Bonita Road, between Milton Court and Bangy Road. The pipeline will connect the new Bonita Pump Station with the water system in Lake Oswego.

“This is exciting progress as Tigard moves closer to securing its own water supply,” said Dennis Koellermeier, Tigard’s project director. “The Bonita Road pipeline work is an important step that connects the communities of Lake Oswego and Tigard together, and helps assure we can meet the future water supply needs of our residents.”

The new water pipeline will be installed at night along Bonita Road to Sequoia Parkway. East of Sequoia Parkway, the pipeline will be installed outside of the travel lanes in the right-of-way next to the freeway overpass, and under I-5 to Bangy Road. To minimize traffic impacts, the majority of construction on Bonita Road will be conducted from 8 p.m. to 5 a.m., Sunday through Thursday. Work outside of the travel lanes will occur during the day from 7 a.m. to 6 p.m., Monday through Friday.

Crews have already begun preliminary construction activities along the pipeline alignment, between the railroad tracks, near 74th Avenue, and 72nd Avenue to locate utilities and switch water services for a few businesses along Bonita Road.

At the end of the month, a deep shaft will be excavated near I-5 in the area by the Paul Schatz Furniture Store during the day, from 7 a.m. to 6 p.m., Monday through Friday. This shaft will provide an entry point for a boring machine to create a tunnel underneath I-5. Once the tunnel is complete, crews will install the new water pipe through the tunnel into Lake Oswego.

Two additional shafts will be constructed—one in the center lane of Bonita Road near 74th Avenue, and another between 72nd Avenue and SW Sequoia Parkway—to tunnel and install pipeline under the railroad tracks as well as a 96-inch storm water culvert on Bonita Road. These shafts will be present 24 hours a day, seven days a week for about two months each. While the shaft is in place near 74th Avenue, there will be no left turns permitted from 74th Avenue onto Bonita Road.

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 and along the shoulders of Bonita Road. Crews also have a temporary staging area off the road near SW Sequoia Parkway. After crews install the pipeline, the road will be temporarily patched. Final paving will occur after the pipe is pressure tested and disinfected, likely in early fall.

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, 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, email us, follow @LOTWater on Twitter, or call the project hotline at 503-697-6502.