Environmental Services continues construction on a project to repair about 800 feet of public sewer pipes in downtown Portland that are 100 to 140 years old and in deteriorating condition. The sewer pipes are showing signs of cracks, breaks, holes, offset pipe connections, and obstructions, putting the pipes at risk of structural failure. Urgent repairs at three locations shown on the map below will protect the public and the environment by reducing the possibility of sewage releases to buildings and streets.
Repairs will be made in three locations (see map).
Construction began mid-February 2018 may continue through September 2018. The timeline is subject to change due to weather, availability of materials, subcontractor schedules, and other circumstances.
This project will include both trenchless and trench excavation construction methods. To repair the main line sewer pipes, the city will employ a process called Cured-in-Place-Pipe Lining (CIPP). This process will insert a liner to strengthen and reinforce the pipes, making them last for many years. This work will occur at night, 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, create a safer work zone, and allow time for the new sewer pipe lining to harden. Some setup and pipe cleaning work will occur during the day.
The CIPP sewer pipe lining process will occur in phases:
- One day to set up the bypass service that will provide uninterrupted sewer service to adjacent buildings
- One night to line the sewer pipe and cure the lining so it hardens in place
- One day or night to reinstate the sewer service lateral connections to adjacent buildings
- One day or night to line the service laterals and remove the bypass service
The spot repair in SW Oak Street just west of SW 1st Avenue will require digging a trench to relocate a water line and repair the sewer pipe. This work has already been completed.
This project may also require some sawcutting and jackhammering to install cleanouts in multiple locations. This noisier work will be done during the day. 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.
Click here for more details about the construction methods.
You can expect the following traffic impacts with this project:
- Accessing the sewer line through manholes will require temporary street closures of one-to-two-block segments on SW Alder, SW Oak, and SW Taylor streets.
- Where needed, local access will be provided by flaggers.
- Access to and from driveways may be delayed.
- Staging areas for materials and construction vehicles will be on cross streets and will require some lane closures and parking removal.
- Bypass pumping to maintain sewer service during construction may require temporary crosswalk closures and pedestrian detours with local access provided by flaggers.