MAILING ADDRESS: 1120 SW 5th Ave, Room 1000, Portland, OR 97204
Environmental Services will soon begin construction on a project to repair or replace up to 6,800 linear feet, over one mile, of public sewer pipes and manholes in downtown Portland that are in deteriorating condition. Some of the pipes were among the first built in Portland, before the 1880s. These improvements will protect water quality, public health, and the environment by reducing the possibility of sewage releases to buildings and streets.
The project is generally located in the Portland State University (PSU) area and is bounded by SW Mill Street to the north, I-405 to the south and west, and SW Harbor Drive to the east. The project also includes work on W Burnside and SW Columbia streets.
Pre-construction activities are anticipated to begin this February or March. Major pipe repairs will follow in the spring when weather is more conducive to pipe lining work. The project is expected to take about a year to complete.
Before the major pipe repair work begins, crews will be in the area preparing for construction. Pre-construction activities may include inspecting pipes and manholes to verify conditions, locating underground utilities and marking them with paint on sidewalks and pavement, fencing trees for protection, tree trimming, setting up traffic controls, moving equipment and materials into the area, and setting up the sewer bypass system necessary to maintain sewer service during repairs.
Regular work hours will be 7 a.m. to 6 p.m. Monday through Friday, and Saturdays as needed. To reduce public impacts and complete the work as quickly as possible, the Portland Noise Office granted Environmental Services a Noise Variance to enable the construction contractor to work both days and nights. Work at each location will take less than a week, including up to three nights to complete the pipe lining sewer repair work. The noisiest work will be done during the day.
Equipment that generates noise will include sewer cleaning trucks, compressors, light trucks, generators, pumps, and ventilation fans. Night work will require lighting of the work zone.
This project will include both trenchless and trench excavation construction methods:
The CIPP sewer pipe lining process will insert a liner to strengthen and reinforce the pipes, making them last for many years. Pipe lining work will occur after 6 p.m. and before 7 a.m., when flows in the pipes are low. Doing this work at night will reduce traffic congestion and allow time for the sewer pipe lining to harden. Some setup and inspections will occur during the day.
The CIPP process will occur in phases:
This project will also require sawcutting and jackhammering to install cleanouts in multiple locations. Cleanouts are typically installed near the curb, but may also be placed in the sidewalk or near the building. They will be used to maintain sewer service during repairs and to provide access for future maintenance. This noisier work, along with any trench excavation, will be done during the day.
Click here for more details and photos about construction methods.
You can expect the following activities and impacts when construction begins:
Businesses and residents should expect periods of inactivity between phases of work, ranging from a few days to a few weeks. In areas where the repair requires a trench, temporary pavement will be applied to the site until permanent pavement can be applied at a later date.
Environmental Services is committed to keeping residents and businesses informed. We encourage you to sign up now for the project’s email update list.
Including the project description, map and schedule
Check out current and previous communications about the project