South Park bike and pedestrian trail improvement is underway — 7th Ave S and S Portland Street intersection to be closed for four weeks

An intersection in Seattle’s South Park neighborhood—Seventh Avenue South and South Portland Street—will be closed for approximately four weeks starting as early as Wednesday, July 16, to accommodate major drainage improvements. Through traffic approaching the intersection will be detoured one block in advance of the intersection. Pedestrians and bicyclists will be allowed to continue through the work zone.

The improvements are part of a project to extend the West Duwamish Trail for bicyclists and pedestrians. A contractor working for the Seattle Department of Transportation will extend the trail from where it currently ends at South Holden Street and Second Avenue South, to Eighth Avenue South and South Kenyon Street. The trail will be 10 feet wide along the south side of Portland Street, with a three and one-half foot buffer separating it from the general traffic roadway which will be 23 feet wide. An existing bicycle route continues south on Eighth Avenue South through South Park. The West Duwamish Trail links to the Alki Trail and to the (low-level) West Seattle bridge trail into downtown Seattle. The trail extension on South Portland Street will provide a safer and more convenient trail connection to South Park.

The project includes drainage improvements in South Portland Street from West Marginal Way South to Eighth Avenue South, pavement on the currently unpaved South Portland Street and new pedestrian lighting. Paving Portland Street, like street paving in much of this neighborhood on the western flank of the Duwamish River, is complicated by low elevation and a high water table, requiring significant drainage improvements. The storm water system will comprise a 30-inch diameter pipe up to 13 feet deep in places.

The contractor started work this week and expects to complete the project by the end of the year.

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