Storm and Surface Water Master Plan

Creek, Stream, Trees

Overview

Issaquah is developing a storm and surface water master plan (SSWMP) to protect the water quality and habitat of local creeks, Lake Sammamish, and Puget Sound by investing in drainage infrastructure and riparian and stream habitat restoration.

Your knowledge of flooding, creeks, and fish habitat in your neighborhood will help us know where to focus our efforts.

Background

Previously, the City completed the Stormwater Management Plan in 2002, and a Stream and Riparian Areas  Restoration Plan was completed in 2006. Issaquah has seen significant growth since these plans were developed and impacts of stormwater runoff on Puget Sound and other waters are becoming more apparent. The SSWMP will provide an analysis of the existing conditions of the City’s streams and drainage infrastructure within its various watersheds and provide a prioritized list of projects that will address water quality, riparian and stream habitat restoration, and localized flooding. To help the City meet these goals, the Washington State Department of Ecology awarded the City a grant to develop a watershed-scale stormwater plan which will support the development of the SSWMP.

Map Stormwater Hotspots

Do you know of a stormwater problem hotspot in Issaquah? Examples include:

  • Street or stream flooding
  • A blocked culvert
  • Habitat loss in a creek
  • A likely source of pollution in a creek or Lake Sammamish

We invite you to answer these questions and map it by February 14, 2020.

Timeline

  • Summer-Winter 2019: Initial data collection on existing conditions
  • December 2019: Workshop with internal City stakeholders and agency/nonprofit partners
  • January-February 2020: Public provides input via “Map Stormwater Hotspots
  • January 2020: Introductory briefing to City Council
  • February/March 2020: Second workshop with internal City stakeholders and agency/nonprofit partners
  • April/May 2020: Third workshop with internal City stakeholders and agency/nonprofit partners
  • June 2020: Public engagement opportunity to review proposed stormwater management solutions
  • June 2020: Fourth workshop with internal City stakeholders and agency/nonprofit partners
  • July 2020: City Council meeting
  • September 2020: Fifth workshop with internal City stakeholders and agency/nonprofit partners
  • September 2020: Public engagement opportunity to review selected capital improvement program
  • October 2020: City Council meeting
  • November/December 2020: State Environmental Policy Act (SEPA) determination
  • January 2021: City Council hearing

Stay Connected

To stay connected on this project, subscribe to the “Sustainability” category via the City’s Notify Me tool.