Watershed Assessment of Manzanita
Manzanita watershed on Bainbridge Island presents an opportunity to design and implement stormwater improvements in accordance with landowner willingness, cost effectiveness, and greatest ecological lift.
Other studies have recognized that this watershed has great potential to regain hydrologic balance and provide intact riparian habitat to support Puget Sound recovery.
The city is currently working with their consultant and other project partners to understand the watershed processes through data gathering, GIS analysis and field observations.
- 10/14/2021 Initial Site Review
Staff from the City and Herrera Environmental Consultants visited over 20 sites in the watershed to review the feasibility of conceptual stormwater retrofit ideas. The sites will be further reviewed for infiltration potential, utility conflicts and contributing basin size to establish a ranked list of projects.
8/21/21 Walk the Watershed: Learn about Manzanita watershed planning
City staff will be leading a guided walk on a 2-mile route through the hills and valleys of Manzanita watershed on Saturday, August 21 at 10 AM in support of the Watershed Assessment of Manzanita. This walk will showcase some of the recent successes while highlighting future challenges facing the aquatic habitat of Manzanita Creek. We will visit an inactive gravel mine, wetlands, fish passable culverts and stormwater ponds along the way. Participants will learn about recent legislation regarding streamflow restoration and how the city is using Federal grant funds that address a disrupted hydrologic cycle. The walk is mainly on quiet roads and trails but also crosses a busy road and should last about 2 hours. Participants should dress appropriately and will be asked to fill out a waiver prior to participating. Due to social distancing needs and challenging road crossings, the tour will be capped at 10 participants. Please RSVP for more details by emailing Christian Berg at email@example.com.
- 5/26/21 Steering Committee
Discussed the geology of the watershed, outreach material and approaches to selecting areas for to focus the outreach based on GIS analysis. Geology for infiltration Link
- 3/25/21 Steering committee
Discussed the use of the Puget Sound Watershed Characterization tool and delineated project assessment units for the model.
- 02/25/21 Kick-off Meeting
A project kick-off meeting was held virtually on February 25 with City Staff and the Natural Resource Management Team. see video link here.
- Restore & Protect Presentation by Kate Macneale, King County Presentation:
- WAM Story Map Presentation:
- Stormwater Control Transfer Program Overview:
- National Estuary Program, EPA
- Administered by the Stormwater Initiative, WA DOE
This project has been funded wholly or in part by the United States Environmental Protection Agency under assistance agreement PC-01J18101 to the Washington State Department of Ecology. The contents of this document do not necessarily reflect the views and policies of the Environmental Protection Agency, nor does mention of trade names or commercial products constitute endorsement or recommendation for use.
- WRIA 15 Streamflow Restoration Planning
- King County Restore and Protect
- COBI Surface Water Management Plan 2001
- Near Term Action (NTA) Puget Sound Partnership
- Watershed Assessment of Manzanita - Fact Sheet
- Manzanita Water Flow & Sediment Export Potential Assessment - August 2021
- Manzanita Watershed Analysis Map
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