Skip to main content (Press Enter).
US Army Corps of Engineers
Seattle District Website
®
About
History
FAQ
Offices
Engineering
Hydraulics and Hydrology
Water Quality
Water Quality Documents
Operational Projections
Historical Datum Regions
Willapa Bay
Grays Harbor
Western Olympic Peninsula
South Puget Sound
North Puget Sound
Whidbey Island
San Juan Islands
Floodplain Management Services
Geospatial
Levee Safety
Dam Safety
Construction
Construction Specifications
Real Estate
Who We Are
Business With Us
Contracting
Legal
Tort Claims
Freedom of Information Act
Regulatory
Small Business
Forecasted Opportunities
MATOC - SATOC
Historic Preservation
Section 408
Missions
Civil Works
Engineering
Hydrology and Hydraulics
Construction Specifications
Levee Safety
Geospatial Services
Design Criteria
Regulatory
Public Notices
Permit Guidebook
Standard Individual Permits
RGP6
Forms
Jurisdictional Determinations
Permit Decisions/Appeals
Emergencies
Water Resources Development Act Sec. 214
Report a Violation
Contact Us
Adams County
Asotin County
Benton County
Chelan County
Clallam County
Clark County
Columbia County
Cowlitz County
Douglas County
Ferry County
Franklin County
Garfield County
Grant County
Grays Harbor County
Island County
Jefferson County
Kitsap County
Kittitas County
Klickitat County
Lewis County
Lincoln County
Mason County
Okanogan County
Pacific County
Pend Oreille County
Pierce County
San Juan County
Skagit County
Skamania County
Snohomish County
Spokane County
Stevens County
Thurston County
Wahkiakum County
Walla Walla County
Whatcom County
Whitman County
Yakima County
King County
Subscribe
News and Updates
SPNs
Shellfish Aquaculture
Aquaculture Contact Form
FAQs
Locks and Dams
Albeni Falls Dam
Project Recreation
Project History
Chief Joseph Dam
Howard Hanson Dam
Chittenden Locks
Calendar of Events
Volunteer
Botanical Garden
Social Media
Closures
Libby Dam
Mud Mountain Dam
Recreation
Fish Counts
Water Safety
Programs and Projects
Authorities
Continuing Authorities Program
Planning Assistance to States and Tribes
Puget Sound and Adjacent Waters
Estuary Habitat Restoration Act
Section 595
Specifically Authorized Projects
Flood Risk Management
Watershed Management
Ecosystem Restoration
Navigation
Water Supply
Hydroelectric Power
Recreation
Floodplain Management Services
Tribal Partnership Program
Projects
Skokomish River Basin
Tacoma Harbor Navigation Improvement
Puget Sound Nearshore Ecosystem Restoration
Puget Sound and Adjacent Waters
Green/Duwamish River Ecosystem Restoration
Big Spring Creek
Lake Meridian Outlet
Meridian Valley Creek
Mill Creek
North Wind's Weir
Riverview Park
Upper Springbrook Creek
Mud Mountain Dam Fish Passage
Centralia, Chehalis Flood Risk Management
Chehalis River Basin Ecosystem Restoration
Shoalwater
Alki Erosion Control Project Seattle, WA
Stillaguamish Ecosystem Restoration Study (discont
Seattle Harbor
Water Resource Project Agreements
External Links
Contact Us
References
Project Review Plans
Navigation
Debris Recovery
Hydrographic Survey
Seattle
Everett
Grays Harbor
Olympia
Quillayute
Swinomish
Tacoma
Navigation Projects
Grays Harbor
LTMS
Navigation Improvement
Semiannual Dredge Meetings
Dredging
About Us
User Manual
Dioxin
Dioxin Guidelines
Puget Sound PCB/Dioxin Survey
Suitability Determinations
SRM
SMARMs
Program Updates
Reports
Disposal
Current Issues
DMMP
Emergency Operations
Environmental
Environmental Documents
Environmental Resources
Environmental Compliance
Environmental Management
Interagency International Services
Military Mission
Locations
Seattle District Sites
USACE Locations
Careers
Student and Intern Employment Opportunities
EEO
Media
News Stories
News Releases
Fact Sheets
Images
Flagship
Library
Contact
USACE Office Locator
RSS
Coronavirus
Home
/
About
/
Offices
/
Engineering
/
Hydraulics and Hydrology
/
Historical Datum Regions
/
North Puget Sound
/
South Colby
Location
70 - South Colby