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The Mountains to Sound Greenway Trust is a public-private partnership of citizens, private landowners, public agencies and local governments working together to protect and enhance the green landscapes along Interstate 90 connecting Puget Sound with the Cascade Mountains.
The Compost Regreening Program, coordinated by the Trust, involves local and international youth groups and other volunteers to revegetate harvested mountain slopes and unsightly, erosion-prone road scars.
Heavy equipment is used to restore the natural slopes and drainages. Biosolids compost is then blended into the soil surface.
At right is an example of log terraces used to hold the recontoured slope in place. Grass seed is mixed into the compost and straw may be layered on top to help stabilize soils.
Grass establishes quickly, preventing erosion by rain and snow during the following months. The next season, volunteers will return to plant tree seedlings.
The restored roadway, visible as a green "x" in the lower left of this picture, contrasts with an un-restored road on the slope above.
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