Sheridan Trunk Sewer Project - Duniway Park
Environmental Services is designing a project to replace approximately 1600 feet of aging, large-diameter public sewer pipes along Duniway Park. Having provided over 100 years of service, the pipes require repairs to maintain reliable sewer service and protect public health and the environment. Construction is currently scheduled to begin late fall 2025 and will take about up to two and a half years to complete.
Per Portland’s Bureau of Environmental Services (BES): “The area we now know as Duniway Park was originally part of Marquam Gulch. Marquam Creek flowed through this gulch down to the Willamette River. In 1912 city engineers designed and built a large sewer collector trunk that followed Marquam Creek’s natural drainage path. This collector is known as the Sheridan Trunk. Building large trunks in this way was typical for the time. We now have large sewer trunk lines following the natural courses of creeks and streams throughout the West Hills.
In the early 1900s, the deep ravine that carried Marquam Creek was filled with waste—a common practice at the time. The dump site primarily contained burnable organic materials and street-sweeping debris. In 1918, Duniway Park was built on top of this fill site with the sewer trunk line lying in the old creek bed at the bottom.
Also included in this project are Bicycle and Pedestrian Safety Improvements Near Duniway Park.
Bikeway and pedestrian lane improvements will be developed before construction begins to allow for construction vehicles to safely enter and exit the park and for pedestrian and cyclist safety and access during construction. Some construction activities may require closing travel lanes for a short period of time.
Construction will create noise, vibration, dust, and other disruptions to normal neighborhood activity. Planned excavations in Duniway Park may also produce occasional odors. The construction may temporarily impact your enjoyment of the park and its surroundings. However, these essential upgrades will strengthen the area’s infrastructure for decades to come and help protect the health of our community and our rivers.”
For more information and to sign up for updates:
https://www.portland.gov/bes/improvements/construction/sheridan-trunk-sewer-project-duniway-park