Thea Foss Waterway Shoreline Stabilization

Date: Summer 2026
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Description

The Thea Foss Waterway Sediment Cap Repair project follows up on a 2006 Superfund cleanup that removed or capped polluted sediment. The City of Tacoma project webpage explains that this project will "help contain remaining contaminants, prevent sediment movement, protect groundwater quality, and support aquatic habitat."

Contractor Active Construction explained that the project required working during extreme low tides from the shoreline and from tugs and barges using long stick excavators, cranes, and other equipment.

Materials

1,100 tons of 4″–8″ Quarry Spalls
700 tons of 4" Minus Gravel Borrow
600 tons of 2-Man Landscape Rock
300 tons of 3" Clean
70 tons of 1½" Minus
20 tons of 5/8" Minus

Highlights

Washington Rock supplied contractor Active Construction (ACI) with over 2,700 tons of material for the project. The crushed rock products provide erosion control for the shoreline while gravel borrow provides sediment enrichment.

Shoreline photo courtesy of ACI.