To protect public health and the environment, King County is building a new 84-inch siphon pipe under Salmon Bay between the Ballard and Interbay areas of Seattle. The new siphon will be installed more than 120 feet underground and connect the Ballard Regulator Station at 5110 Shilshole Avenue Northwest in Ballard to the North Interceptor at West Commodore Way and 24th Avenue West intersection in Interbay

During construction, the northern sidewalk on Shilshole Ave NW between 20th Ave NW and NW Dock Place will be closed and other traffic detours will be necessary along Shilshole Ave NW on the north end of the project and W. Commodore Way on the south side. Crews will typically work from 7 a.m. to 5:30 p.m. Monday through Friday, until construction is complete in late 2013.

Project Web site:  http://www.kingcounty.gov/environment/wtd/Construction/Seattle/BallardSiphon.aspx