US Army Corps of Engineers
Seattle District Website

DMMP Disposal Sites

Links to maps, coordinates and monitoring reports.  For more information or to ask about additional monitoring documents, contact the DMMO.

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Contact the DMMO

Seattle District (CENWS)
Dredged Material Management Office
PO Box 3755
Seattle, WA 98124-3755

CENWS-DMMOTeam@usace.army.mil

206-764-6083
206-764-6945
206-764-6550
206-764-6713

 

 

 

       

Water Body

Site Name

Site Type

Status 

Puget Sound

Anderson/Ketron

Nondispersive

Open

Bellingham Bay

Nondispersive

Inactive

Commencement Bay

Nondispersive

Open

Elliott Bay

Nondispersive

Open 

Port Gardner

Nondispersive

Open 

Rosario Strait 

Dispersive

Open 

Port Townsend

Dispersive

Open 

Port Angeles

Dispersive

Open 

Grays Harbor

Point Chehalis

Dispersive; Estuarine

Open

South Jetty

Dispersive; Estuarine

Open 

3.9-Mile SW

Dispersive; Ocean Site

Unused

Willapa Bay

Cape Shoalwater

Dispersive; Estuarine

 Unused

Goose Point

Dispersive; Estuarine

 Unused

 

 

 

 

Dispersive Disposal Site Fate and Transport Analysis

The DMMP investigated the fate and transport of dredged material placed at the dispersive dredged material placement sites within the Strait of Juan de Fuca and Puget Sound using site specific sediment data and a recent numerical model developed for the Puget Sound Basin.  This study, completed in September 2012, was to determine if hydrodynamic conditions indicated the potential for dredged materials to be transported in the vicinity of critical shellfish habitat identified by the Lower Elwha Klallam Tribe (LEKT) near Port Angeles, Sequim, and Port Townsend, Washington.  Links to the final study report are here:

2020 Port Gardner Monitoring Report

The Final Data Report was finalized in July 2021 and is now available:

2020 Pilot Study: DMMP Monitoring of the Port Gardner Non-Dispersive Unconfined Open-Water Dredged Material Disposal Site

Appendix B: SPME Special Study Results

Additional appendices are available upon request. Please contact the DMMO.

2017 Commencement Bay Monitoring Report

The Final Data Report was finalized in March 2018 and is now available:

2017 Tiered-Full Monitoring at the Commencement Bay Non-Dispersive Unconfined Open-Water Dredged Material Disposal Site

Appendices are available upon request. Please contact the DMMO.

2013 Elliott Bay Monitoring Report

The Final Data Report was finalized in August 2014 and is now available:

2013 Partial Monitoring at the Elliott Bay Non-Dispersive Unconfined Open-Water Dredged Material Disposal Site (29 MB)

Appendices are available upon request.  Please contact the DMMO.

2010 Port Gardner Monitoring Report

The Final Data Report was finalized in March 2010 and is available here:

2010 Tiered-Full Monitoring at the Port Gardner Non-Dispersive Unconfined Open-Water Dredged Material Disposal Site

Appendices are available upon request. Please contact the DMMO.