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King County enters into Interlocal agreements (ILAs) with other public agencies in the interest of cooperatively sharing resources for their mutual benefit, in accordance with RCW 39.34. This Web page provides access to some of the County’s Interlocal Agreements. ILAs that were recorded with the King County Recorder’s Office are accessible from the Recorder’s Office website.

Use the search box below to most effectively search for items on this page.

For copies of the original ILAs, or for questions about the ILAs, please contact the King County agency that is party to the agreement.

Date Party 1 Party 2 Party 3 Regarding Document image
1/1/2007 King County City of Woodinville   Provision of District Court services Signed document (PDF, 1.13MB)
Exhibits (PDF, 1MB)
Amendment to Exhibit E (PDF, 277KB)
4/28/2009 King County Flood Control Zone District City of Auburn   Opportunity Fund Projects Signed document (PDF, 482KB)
9/19/2009 King County Flood Control Zone District Town of Beaux Arts Village   Opportunity Fund Projects Signed document (PDF, 477KB)
10/16/2009 King County Flood Control Zone District City of Bellevue   Opportunity Fund Projects Signed document (PDF, 465KB)
7/17/2009 King County Flood Control Zone District City of Black Diamond   Opportunity Fund Projects Signed document (PDF, 439KB)
9/28/2009 King County Flood Control Zone District City of Bothell   Opportunity Fund Projects  Signed document (PDF, 485KB)
5/26/2009 King County Flood Control Zone District City of Carnation   Opportunity Fund Projects Signed document (PDF, 482KB)
6/20/2009 King County Flood Control Zone District City of Covington   Opportunity Fund Projects Signed document (PDF, 470KB)
6/4/2009 King County Flood Control Zone District City of Des Moines   Opportunity Fund Projects  Signed document (PDF, 475KB)
5/14/2009 King County Flood Control Zone District City of Duvall   Opportunity Fund Projects  Signed document (PDF, 477KB)
6/11/2009 King County Flood Control Zone District City of Enumclaw   Opportunity Fund Projects  Signed document (PDF, 475KB)
7/2/2009 King County Flood Control Zone District City of Federal Way   Opportunity Fund Projects  Signed document (PDF, 489KB)
5/4/2009 King County Flood Control Zone District Town of Hunts Point   Opportunity Fund Projects Signed document (PDF, 477KB)
10/5/2009 King County Flood Control Zone District City of Issaquah   Opportunity Fund Projects Signed document (PDF, 477KB)
5/5/2009 King County Flood Control Zone District City of Kenmore   Opportunity Fund Projects Signed document (PDF, 477KB)
6/17/2009 King County Flood Control Zone District City of Kent   Opportunity Fund Projects Signed document (PDF, 592KB)
4/13/2010 King County Flood Control Zone District King County   Opportunity Fund Projects Signed document (PDF, 478KB)
9/18/2009 King County Flood Control Zone District City of Kirkland   Opportunity Fund Projects Signed document (PDF, 477KB)
8/5/2009 King County Flood Control Zone District City of Lake Forest Park   Opportunity Fund Projects Signed document (PDF, 481KB)
8/27/2009 King County Flood Control Zone District City of Maple Valley   Opportunity Fund Projects Signed document (PDF, 493KB)
5/7/2012 King County Flood Control Zone District City of Medina   Opportunity Fund Projects Signed document (PDF, 576KB)
11/26/2012 King County Flood Control Zone District City of Mercer Island   Opportunity Fund Projects Signed document (PDF, 571KB)
5/14/2009 King County Flood Control Zone District City of Normandy Park   Opportunity Fund Projects Signed document (PDF, 478KB)
8/5/2009 King County Flood Control Zone District City of North Bend   Opportunity Fund Projects Signed document (PDF, 480KB)
5/12/2009 King County Flood Control Zone District City of Pacific   Opportunity Fund Projects Signed document (PDF, 478KB)
6/5/2009 King County Flood Control Zone District City of Redmond   Opportunity Fund Projects Signed document (PDF, 471KB)
6/11/2009 King County Flood Control Zone District City of Renton   Opportunity Fund Projects Signed document (PDF, 482KB)
5/20/2009 King County Flood Control Zone District City of Sammamish   Opportunity Fund Projects Signed document (PDF, 483KB)
6/2/2009 King County Flood Control Zone District City of Seatac   Opportunity Fund Projects Signed document (PDF, 477KB)
7/7/2009 King County Flood Control Zone District City of Seattle   Opportunity Fund Projects Signed document (PDF, 473KB)
6/2/2009 King County Flood Control Zone District City of Shoreline   Opportunity Fund Projects Signed document (PDF, 465KB)
8/11/2009 King County Flood Control Zone District Town of Skykomish   Opportunity Fund Projects Signed document (PDF, 478KB)
7/9/2012 King County Flood Control Zone District City of Snoqualmie   Opportunity Fund Projects Signed document (PDF, 592KB)
10/1/2009 King County Flood Control Zone District City of Tukwila   Opportunity Fund Projects Signed document (PDF, 485KB)
5/29/2009 King County Flood Control Zone District City of Woodinville   Opportunity Fund Projects Signed document (PDF, 442KB)
5/14/2009 King County Flood Control Zone District Town of Yarrow Point   Opportunity Fund Projects Signed document (PDF, 472KB)
9/9/2009 City of Duvall   King County   Zoning for Burhen Property Addition to Urban Growth Area Signed document (PDF, 168KB)
2/23/2010 King County City of Maple Valley   Adopting the joint plan for Summit Place Signed document (PDF, 2.24MB)
8/11/2010 King County City of Issaquah       Third amendment to Grand Ridge Joint Amendment     Signed document (PDF, 714KB)
6/1/2011 City of Kirkland King County   Annexation of the Juanita-Finn Hill-Kingsgate Annexation Area Signed document (PDF, 7.57MB)
6/6/2011 King County Woodinville Fire and Rescue   Administration of an annual fire inspection program Signed document (PDF, 278KB)
10/10/2011 King County City of Bellevue Fire Department   Administration of an annual fire inspection program Signed document (PDF, 340KB)
10/19/2011 King County Ferry District King County   Purchase of Flexpass Signed document (PDF, 286KB)
10/19/2011 King County King County Ferry District   Supplementary water taxi service Signed document (PDF, 711KB)
10/31/2011 King County King County Ferry District   Administrative and support services (third addendum) Signed document (PDF, 87KB)
2/22/2012 King County Flood Control District King County City of Bellevue  Transfer of assets and responsibilities of the former South West Lake Sammamish Flood Control Zone District    Signed document (PDF, 2MB)
10/18/2012 King County City of Auburn   Provision of road related maintenance services Signed document (PDF, 665KB)
11/1/2012 King County City of Auburn   For provision of District Court services Signed document (PDF, 3MB)
12/26/2012 King County King County Flood Control Zone District   Flood protection services, third amendment Signed document (PDF, 156KB)
12/26/2012 King County King County Ferry District   Administrative and support services Signed document (PDF, 3.2MB)
1/31/2013 King County Flood Control Zone District City of Algona   Opportunity Fund Projects Signed document (PDF, 726KB)
1/25/2013 King County City of Lake Forest Park   Provision of limited in-custody District Court services  Signed document (PDF, 312KB)
5/30/2013 King County City of Auburn   Provision of services by the King County Road Services Division Signed document (PDF, 648KB)
5/31/2013 King County City of Tukwila   Transfer of a drainage facility Signed document (PDF, 425KB)
6/6/2013 City of Kent King County Flood Control Zone District   Levee Construction, Operation and Maintenance (Briscoe-Desimone Levee) Signed document (PDF, 7MB)
2/15/2013 City of Auburn King County King County Flood Control Zone District Conveyance of easements associated with Reddington Levee Extension and Setback Project Signed document (PDF, 1MB)
12/18/2006 Federal Highway Administration King County Road Services Division   King County Mount Si Bridge Replacement Project Signed document (PDF, 137KB)
2/27/1990 King County City of Seatac   Provision of Road Services Signed document (PDF, 747KB)
Amendment to Exhibit 3 (PDF, 25KB)
1/10/2012 King County City of Renton   Improvements to Renton Avenue South between 75th Avenue South and 76th Avenue South - Phase 1A Signed document (PDF, 205KB)
2/28/2012 King County Muckleshoot Indian Tribe   Transfer of county roads located on the Muckleshoot Indian Reservation Signed document (PDF, 229KB)
6/8/2012 Washington State Department of Transportation King County Department of Transportation   Bridge Inspection Signed document (PDF, 212KB)
9/21/2012 City of Redmond King County   Right-of-way use authorization Signed document (PDF, 1MB)
10/3/2013 City of Seattle King County   Regional transfer of development rights and tax increment financing of infrastructure Signed document (PDF, 1.6MB)
1/6/2014 King County King County Flood Control Zone District   Fourth Amendment to agreement regarding flood proection services Signed document (PDF, 69KB)
3/27/2014 King County King County Transportation District   Funding for transportation improvements Signed document (PDF, 1.5MB)
4/9/2014 King County Department of Natural Resources and Parks / Parks and Recreation Division City of Maple Valley   Contribution of funds towards the design, development, and construction of Combination Fields #1 and #2 and related infrastructure at Ravensdale Park Signed Document (PDF, 929KB)
4/10/2014 City of Kent King County Flood Control Zone District   Levee construction, operation and maintenance of the Russell Road Upper Levee - North Reaach and South Reach, River Mile 19.25 to 20.4, Right Bank Signed document (PDF, 925KB)
5/15/2014 King County City of Bellevue
Provision of services by the King County Road Services Division Signed document (PDF, 266KB)
7/23/2014 King County City of Tukwila
Landmark Designation and Protection Services Signed document (PDF, 297KB)
9/18/2014 King County King County Ferry District   Administrative and Support Services (Addendum) Signed document (PDF, 236KB)
10/13/2014 King County City of Seattle   Seattle Streetcar System Signed document (PDF, 2.18MB)
11/19/2014 King County City of Burien   Design, Construct, Operate and Maintain Lake to Sound Trail, Segment B, Within City Boundaries Signed document (PDF, 2MB)
11/19/2014 King County City of Seatac   Design, Construct, Operate and Maintain Lake to Sound Trail, Segment B, Within City Boundaries Signed document (PDF, 5MB)
12/19/2014 Washington State Department of Transportation, Ferries Division King County Ferry District   Reimbursement Agreement No. GCB 1934 Re: Certain Pre-Construction Work for New Passenger-Only Ferry Terminal at Seattle Multimodal Terminal Signed document (PDF, 1.8MB)
12/23/2014 Washington State Department of Transportation, Ferries Division King County Ferry District   Design Phase Agreement No. GCB 1951 For New Passenger-Only Ferry Terminal at Seattle Multimodal Terminal Signed document (PDF, 9.2MB)
8/18/1994 King County City of Carnation   Landmark Designation and Protection Services Signed document (PDF, 526KB)
3/17/2005 King County City of Des Moines   Landmark Designation and Protection Services Signed document (PDF, 731KB)
3/20/1995 King County City of Auburn   Landmark Designation and Protection Services Signed document (PDF, 589KB)
7/24/1995 King County City of Black Diamond   Landmark Designation and Protection Services Signed document (PDF, 570KB)
12/2/2013 King County City of Burien   Landmark Designation and Protection Services Signed document (PDF, 269KB)
7/3/2000 King County City of Issaquah   Landmark Designation and Protection Services Signed document (PDF, 553KB)
11/15/1999 King County City of Kirkland   Landmark Designation and Protection Services Signed document (PDF, 173KB)
4/2/2008 King County City of Sammamish   Landmark Designation and Protection Services Signed document (PDF, 745KB)
5/12/2010 King County City of Seattle   Historic and Archaeological Resource Review Services Signed document (PDF, 911KB)
4/10/2000 King County City of Woodinville   Landmark Designation and Protection Services Signed document (PDF, 764KB)
1/13/2015 King County King Conservation District   Natural Resource Conservation Signed document (PDF, 6MB)
4/8/2015 King County King County Flood Control Zone District   Sixth Amendment to Interlocal Agreement Regarding Flood Protection Services Signed document (PDF, 76KB)
4/20/2015 City of Kent King County Flood Control Zone District
Revised Agreement for Levee Construction, Operation and Maintenance. Russell Road Upper Levee - North Reach and South Reach, River Mile 19.25 to 20.24, Right Bank Signed document (PDF, 1MB)
4/27/2015 Washington State Department of Ecology King County Flood Control Zone District   Amendment Number One to Grant Number G1300118 Signed document (PDF, 168KB)
6/1/2015 King County King County Flood Control Zone District   Flood Protection Services, 7th Amendment Signed document (PDF, 73KB)
7/30/2015 King County, Department of Natural Resources and Parks, Parks and Recreation Division
City of Enumclaw
  For providing funds for the City for the King County Fair
Signed document (PDF, 615KB)
7/29/1997 King County Department of Transportation, Road Services Division
Washington State Department of Transportation
  Public Works Emergency Mutual Aid
Signed document (PDF, 6MB)
12/2/2015 King County
City of Carnation, City of Duvall, City of North Bend, City of Snoqualmie, Snoqualmie Tribe, Town of Skykomish, Tulalip Tribes,
  Snoqualmie and South Fork Skykomish Watersheds within Water Resource Inventory Area 7
Signed document (PDF, 717KB)
12/29/2015 King County
King County Flood Control Zone District
  Flood Protection Services
Signed document (PDF, 807KB)
12/18/2015 King County
Town of Beaux Arts Village, City of Bellevue, City of Bothell, City of Clyde Hill, City of Edmonds, Town of Hunts Point, City of Issaquah, City of Kenmore, City of Kent, City of Kirkland, City of Lake Forest Park, City of Maple Valley, City of Medina, City of Mercer Island, City of Mill Creek, City of Mountlake Terrace, City of Mukilteo, City of Newcastle, City of Redmond, City of Renton, City of Sammamish, City of Seattle, City of Shoreline, Snohomish County, City of Woodinville, Town of Woodway, Town of Yarrow Point

For the Watershed Basins within Water Resource Inventory Area 8
Signed document 
(PDF, 1.1MB)
3/14/2016 King County
City of Buckley, City of Enumclaw, Washington State Department of Transportation, Pierce County
  Cooperative Planning, Design, and Construction of a Foothills Trail Non-Motorized Bridge Across the White River
Signed document (PDF, 4MB)
Exhibit A (PDF, 972KB)
Amendment 1 (PDF, 1MB)
2/22/2016 King County
City of Algona, City of Auburn, City of Black Diamond, City of Burien, City of Covington, City of Des Moines, City of Enumclaw, City of Federal Way, City of Kent, City of Maple Valley, City of Normandy Park, City of Renton, City of Seatac, City of Seattle, City of Tacoma, City of Tukwila
  Green River, Duwamish River and Central Puget Sound Watersheds within the geographic planning area of Water Resource Inventory Area 9
Signed document (PDF, 1MB)
6/28/2016 City of Kent
King County Flood Control Zone District
  Alternatives and Property Acquisition, Milwaukee II Levee Improvement Project, River Mile 24.04 to 24.25, Right Bank
Signed document (PDF, 599KB)
6/14/2016 King County
City of Kenmore
  Provision of Surface Water Services and Transfer of Drainage Facilities and Properties, First Amendment
Signed document (PDF, 188KB)
2/3/2017 King County
City of Normandy Park
  Provision of Road Services
Signed document (PDF, 776 KB)
1/13/2017
King County
Washington State Department of Natural Resources
  Trailhead Agreement - Granite Creek Trailhead
Signed document (PDF, 4.1MB)
6/29/2017
King County
City of Enumclaw
  providing funds to the city for the King County Fair
Signed document (PDF, 750KB)
12/11/2017
King County
City of Carnation
  Open Space Acquisition Projects
Signed document (PDF, 583KB)
11/27/2017
King County
City of Bellevue
  Provision of Services by the Road Services Division
Signed document (PDF, 709KB)
11/6/2017
King County
City of Renton
  Landmark Designation and Protection Services
Signed document (PDF, 714KB)
5/5/2017
King County
City of Enumclaw
  Provision of Services by the King County Road Services Division
Signed document (PDF, 1.5MB)