Dedicated to restoring and maintaining a healthy

Stillaguamish River Watershed since 1990

www.stillaguamishwatershed.org

The mission of the Stillaguamish Watershed Council (SWC) is to maintain a healthy, functioning Stillaguamish Watershed by

providing a local forum in which agencies, organizations, communities, and the public

can engage in a collaborative watershed based process of decision making and

coordination.This slideshow highlights the work of the SWCwww.stillaguamishwatershed

.org

Steelhead Haven Fine Sediment Reduction Project Sponsored by the Stillaguamish Tribe of Indians

Location

This project built a wood revetment 500 feet from the toe of the Steelhead haven landslide thereby reducing fine sediment inputs into the North Fork Stillaguamish. A sediment retention pond was also constructed to capture surface erosion off of the landslide, also reducing fine sediment inputs into the NF Stillaguamish.

Steelhead Haven Fine Sediment Reduction Project Sponsored by the Stillaguamish Tribe of Indians

Project Site Plan

This project built a wood revetment 500 feet from the toe of the Steelhead haven landslide thereby reducing fine sediment inputs into the North Fork Stillaguamish. A sediment retention pond was also constructed to capture surface erosion off of the landslide, also reducing fine sediment inputs into the NF Stillaguamish.

Expected Channel Migration

Expected Head cut

Expected Change

Log Cribwall Placement

Steelhead Haven Fine Sediment Reduction Project Sponsored by the Stillaguamish Tribe of Indians

This project built a wood revetment 500 feet from the toe of the Steelhead haven landslide thereby reducing fine sediment inputs into the North Fork Stillaguamish.

Cribwall 1,300 feet long, 25 feet high

What the river will see

Steelhead Haven Fine Sediment Reduction Project Sponsored by the Stillaguamish Tribe of Indians

This project built a wood revetment 500 feet from the toe of the Steelhead haven landslide thereby reducing fine sediment inputs into the North Fork Stillaguamish.

Left: Aerial view of the wood revetment backfilled with wood debris Below: Close up of backfill

Steelhead Haven Fine Sediment Reduction Project Sponsored by the Stillaguamish Tribe of Indians

A sediment retention pond was also constructed to capture surface erosion off of the landslide, also reducing fine sediment inputs into the NF Stillaguamish.

20 Acre-feet of storage During the first flooding event the river migrated toward the

structure as designed

For more information about the Stillaguamish Watershed Council visit

our website at:

www.stillaguamishwatershed.org