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Salmon Bay Outfall Replacement

Seattle Public Utilities (SPU) will be replacing an outfall pipe at the foot of 24th Ave. N.W., where an existing 30-inch diameter wooden pipe carries stormwater into Salmon Bay.

During heavy rain storms, the capacity of the old pipe cannot handle the combined volume of stormwater and sewage, allowing some raw sewage to be released into Salmon Bay. The outfall pipe originally extended approximately 62 feet from shore. It has deteriorated so severely that today it extends only about ten feet from shore.

Workers will be taking boring samples from the bay sediments and from the immediate upland area. The data they collect will be used for the preliminary engineering of a project to replace the existing pipe and install a new manhole just upland from it. That work is currently scheduled for the summer of 2014.

For more information, contact Jerry Waldron, Project Manager, at (206) 684-5061 or

SEPA Status

SEPA Checklist and Determination of Non-Significance (DNS) were issues on September 12, 2013.

SEPA Checklist (pdf)

SEPA Determination of Non-Significance (pdf)