City of Sammamish – Long-Term Biological and Water Quality Monitoring of Ebright Creek
From 2014 to 2018, the 48 NORTH team conducted post-construction monitoring of Ebright Creek after the development of both Chestnut Lanes and the Crossing at Pine Lakes housing developments in the City of Sammamish. Ebright Creek is the home to kokanee salmon (Oncorhynchus nerka), the non-anadromous (non-migrating) and smaller form of sockeye salmon.
Our team completed a comprehensive baseline stream habitat assessment to better understand the relationship between stormwater, hydrology, and natural conditions in Ebright Creek as a means to evaluate whether the stream habitat of Ebright Creek was being degraded by any increased erosion and sedimentation resulting from the construction of the housing developments. Our team of biologists mapped habitat units (pools, riffles and other) for each stream reach. We also collected macroinvertebrates during summer-low flow (August) conditions. Our in-house macroinvertebrate biologist identified multiple metrics including taxa richness, predator percent, and percent dominant. 48 NORTH uploaded this data onto King County’s Puget Sound Stream Benthos online database.
The project included extensive water monitoring, to ensure the stream’s water temperature and turbidity limits are not exceeded and that water level fluctuations in the surrounding wetland features do not exceed minimum or maximum limits.
To view the Ebright Creek Monitoring Final Report prepared for the City of Sammamish, please visit: http://www.sammamish.us/departments/publicworks/Default.aspx