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King County's Barton CSO Control project constructed 91 roadside rain gardens on 15 blocks in West Seattle. The project, completed in 2015, is a type of green stormwater infrastructure.

King County is responsible for regular maintenance of the roadside rain gardens year round. You can expect to see crews onsite at least monthly performing regular maintenance. Expect more frequent visits before and after large storms, and during the summer growing season.

raingarden maintenance

Here is what crews will be doing:

  • Monitoring plant health
  • Removing weeds
  • Monitoring drainage
  • Removing debris and trash
  • Clearing curb inlets and gutters
  • Caring for the pipes and deep wells
  • Gathering ongoing information on the performance of roadside rain gardens

Download the Roadside Rain Garden Maintenance Schedule and Tasks , which includes two schedules (pages 2 and 3):

  • Establishment Maintenance Schedule - through Summer 2017
  • Routine Maintenance Schedule - starting Fall 2017

Operations and Maintenance (O&M) Manual, September 14, 2015. This document is available to download as two separate files:

The long-term goal is to maintain the roadside rain gardens in line with the “acceptable maintenance .

24-hour maintenance hotline, 206-263-3801King County has installed curb markers on every block with information on how to contact the County with questions or concerns about the rain gardens. Please call 206-263-3801 if you see:

  • Ponding water that lasts longer than 24 hours after it has stopped raining
  • Vandalism
  • Spills or contamination
  • Other major concerns

Roadside rain garden neighbors

If you see a piece of trash, please pick it up. Thank you for your ongoing care of the roadside rain gardens in your neighborhood. You are doing your part to protect the health of Puget Sound!

raingarden maintenance

Janice Johnson
CSO Control Program