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Scope/Content: Abstract: Project Summary: The Ferson-Otter Creek Watershed drains about 50 square miles of rapidly developing agricultural land. The two subject dams are located about three miles upstream of the stream's confluence with the Fox River near St. Charles, Illinois. The presence of these dams prevents fish migration between the 50 square mile Ferson-Otter Creek watershed and the Fox River. The Forest Preserve District of Kane County (FPDKC) and the Kane County Department of Environmental Management (KCDEM) are cooperating on this project to restore fish passage to Ferson-Otter Creek. With funding supplied by the U.S. Fish and Wildlife Service and KCDEM, these two dams will be demolished in place. The total project budget, including engineering and construction is less than $ 15,000. Sediment transport of existing in-stream bedload following removal of the dams is expected to be minimal as the dam pool above the dam was scoured clean during the flood event of September 2008, leaving only sand, gravel, and cobbles. This condition, combined with the short construction window (2 to 3 days), greatly reduces the potential for sediment disturbance and mobilization. The work is also scheduled for early October, a low-flow period. The shallow water depth of the channel downstream of the project site precludes the use of any in-stream SESC measures, such as a turbidity curtain. Due to the limited funding available, no riparian buffer is proposed at this time. However, the FPDKC is in the process of developing a Master Plan for this site, and they are very aware of the benefits of native stream buffers. Similarly, due to the minimal impact of the project and its location on publicly owned property, no formal management and monitoring plan has been prepared. However, this adaptive management plan was developed to address any unexpected streambank erosion that may occur post dam modification.
Pre- and post-project monitoring Dams Dam retirement
Ferson-Otter Creek, IL Davoust Dam and Creek Bend Forest Preserve Dam