Rock Lake 10 & 15, located in Lyon County, Minnesota, are vital structures owned and regulated by the local government for flood risk reduction along the Cottonwood River. These rockfill dams, completed in 1988, stand at a height of 12.5 feet and have a storage capacity of 500 acre-feet. With a drainage area of 26 square miles, they play a crucial role in mitigating flood hazards in the region.

Managed by the Minnesota Department of Natural Resources, these dams have a low hazard potential and are inspected every 8 years to ensure their structural integrity. While the condition assessment is currently marked as 'Not Rated,' these dams have been serving their primary purpose effectively for over three decades. With state permitting, inspection, and enforcement in place, Rock Lake 10 & 15 are key components in the flood management infrastructure of the area.

The dams' association with the St. Paul District of the US Army Corps of Engineers highlights their importance in local water resource management. Despite being unlisted as USACE structures, Rock Lake 10 & 15 contribute significantly to the overall flood risk reduction efforts along the Cottonwood River. As climate change continues to impact water resources, these dams remain crucial in safeguarding the community against potential flooding events.