12th Ave NW Basin Drainage Improvement – July project update
From Seattle Public Utilities
Last month, we reached out with an update on the 12th Ave NW Basin Drainage Improvement project to share that the design for the underground detention pipe and conveyance project elements had been completed and a contractor had been selected. We are now excited to share that construction of the pipe and conveyance elements will begin in late July or early August 2022, and potentially as early as July 25, 2022.
We expect construction to last approximately 6 months, with work taking place Monday through Friday, from 8 am to 5pm. The underground work is expected to be complete in 2022, but this is subject to change due to weather and other factors. Final paving is weather dependent and planned for early 2023.
This work will be done in the public right-of-way along 11th Ave NW between NW 120th and NW 122nd St, 10th Ave NW between NW 122nd and NW 125th St, and along NW 125th St from 10th to 6th Ave NW. See highlighted area on the map below. The contractor expects to start installing underground pipe on 10th Ave NW and proceed north and east along NW 125th Street. Afterward, they will start at the south end of 11th Ave NW and proceed north to their starting point. Tree trimming in the right-of way will take place before underground construction can start.
There is no update on the natural drainage systems element of the project, as it is still being designed and construction has been rescheduled.
Map showing underground pipe and conveyance work area
Anticipated Impacts
During construction you can expect:
- Construction-related noise, dust, vibrations
- Restricted street parking near work zones
- Partial lane closures
- Equipment being stored in the right of way
- Temporary access restrictions and limited access to some driveways during daytime working hours
Pedestrian access and access for essential services (such as emergency vehicles, mail delivery and garbage pickup) will always be maintained.
Any temporary access limitations to driveways will be communicated in advance by the construction management team.
Construction Safety is Everyone’s Job, check out some top safety tips at: www.seattle.gov/utilities/constructionsafety
Contact Us
Direct replies to GovDelivery email messages will not be received by the project team. As always, if you have a question about the project, please feel free to contact the project manager directly by emailing Sierra.Gawlowski@seattle.gov
