Griswold Creek Stream Study through the Lake Erie Protection Fund 

Griswold Creek is as a cold water habitat stream that flows through Chester and Russell Townships and enters the Chagrin River in Hunting Valley. Griswold Creek maintains a unique biological community and a cold stream temperature due to significant amounts of groundwater feeding the stream. Griswold Creek is home to the redside dace (Clinostomus elongates), a declining fish species in Ohio. In addition, steelhead trout have been observed spawning in the lower reaches of Griswold Creek. Ohio EPA has determined that Griswold Creek is in partial attainment of the CWH use at Fairmount Road, but the lower reach at Falls Road is in nonattainment.
 
Griswold Creek's bed and banks are severely eroding, causing excessive sediment inputs to the State Scenic Chagrin River and ultimately Lake Erie. CRWP compiled a summary that highlights the erosion problems of Griswold Creek landowners. To address the erosion problems, Ohio Lake Erie Commission awarded CRWP a grant to conduct stream surveys and develop conceptual stream restoration designs along Griswold Creek. 
 
To determine appropriate restoration opportunities and details for Griswold Creek, Chagrin River Watershed Partners, Inc. (CRWP) and our selected subcontractor, EnviroScience, Inc. collected data on channel dimensions and slope in stable and impaired sections of Griswold Creek. The investigation documented and summarized existing conditions and identifies possible restoration measures to restore natural stream function and stability. EnviroScience developed a longitudinal profile that shows slope changes over the length of the stream and a regional curve that relates the cross-sectional area of the channel to the drainage area of the watershed. EnviroScience used this information to prepare conceptual restoration plans for two sites on Griswold Creek. The conceptual plan for the upstream site involves building up the streambed to its former elevation to reconnect it with its floodplain and promote stormwater storage in the existing riparian wetland. The conceptual plan for the downstream site incorporates streambank stabilization techniques with floodplain expansion. The conceptual plans include graphics, conceptual engineering details, and cost estimates.  The results of this study were presented at a public meeting held on August 22, 2013. Click here for the meeting presentation.  The full text of the stream study report can be found here.
This project was funded in part through the Lake Erie Protection Fund, administered by the Ohio Lake Erie Commission.  The Lake Erie Protection Fund is supported by the voluntary contribution of Ohioans who purchase Lake Erie license plates.