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Information for Shoreline

Green Stormwater Infrastructure

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Rain Garden 1
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Overview and History

“Greenworks” was the name given to an innovative City of Shoreline pilot program for stormwater management. This program, active from 2010 to 2015, sought to increase awareness and application of Green Stormwater Infrastructure (GSI) – also known as Low Impact Development (LID) stormwater or natural drainage facilities -- techniques by installing GSI/LID retrofits to existing storm drain systems within the public right-of-way.

The Greenworks pilot program was part of a larger ongoing effort to implement GSI/LID stormwater facilities city-wide, above and beyond the requirements of the City’s NPDES Stormwater Permit and as guided by the Washington State Department of Ecology’s Stormwater Management Manual for Western Washington. GSI/LID stormwater facilities, such as the bioretention cells and swales and rain gardens installed under the Greenworks program, generally use soils and vegetation to mimic pre-development hydrologic processes of infiltration, filtration, storage evaporation, and transpiration. These processes can mitigate the ecologically damaging impacts of urban runoff by removing pollutants and reducing peak flows downstream.

Greenworks projects were typically implemented at locations selected to provide maximum effectiveness by improving poor drainage conditions in addition to providing water quality treatment and flow control. Other recent capital projects, such as the Aurora Corridor Project, have installed LID stormwater retrofits on a larger scale.

Residents are encouraged to view our Greenworks Facilities Operations & Maintenance Guidelines for Residents to learn more about how Greenworks/GSI facilities work and if interested in volunteering to provide basic care to ensure optimal function and health for a GSI/LID facility. More information about rain gardens can be found with our Rain Gardens brochure. The City offers the Soak It Up LID Rebate Program providing funding assistance for eligible GSI/LID stormwater projects on private property.

City of Shoreline GSI/LID Stormwater Facilities, by year of construction


  • Green Street “Complete Street” Demonstration Project
  • Greenworks bioretention facilities at:
    • 12th Avenue NE, 17000 block
    • N 149th St and Linden Ave N
    • N 149th St between Westminster Way N and Evanston Ave N
    • Wallingford Ave N, 15200 block 


  • Ashworth Ave N from N 185th St to N 192nd St


  • North Fork Thornton Creek Low Impact Development (LID) Stormwater Retrofit Project


  • Rain garden at Firlands Way N and N 188th St
    Greenworks bioretention facilities at:
    • N 188th St and Densmore Ave N
    • NE 148th St and 5th Ave NE 


  • Greenworks bioretention facilities at:
    • 32nd Avenue NE and NE 147th Street
    • Stone Avenue N and 157th Street

Future (date to be determined)

NE 148th St Infiltration Facilities
10th Ave NE Drainage Improvements

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