Sodus 4 S is a local government-owned structure located in Lyon, Minnesota, designed for roadway retention. This dam is regulated by the Minnesota Department of Natural Resources and is permitted, inspected, and enforced by state authorities. The dam sits on Meadow Creek-TR and is classified as a Buttress dam with a height of 33 feet and a length of 1000 feet. It has a storage capacity of 480 acre-feet and serves a drainage area of 2.2 square miles.

Despite its low hazard potential, Sodus 4 S has not been rated for its condition assessment. The last inspection took place in April 2019, with a frequency of once every 8 years. Emergency action plans, risk assessments, and inundation maps for the dam are not currently available. The structure does not have any associated locks or spillways, and its operations and maintenance are not funded or regulated by federal agencies. Sodus 4 S presents an essential piece of infrastructure in managing water resources in the area.

For water resource and climate enthusiasts, Sodus 4 S offers a fascinating case study in local dam management and regulation. With its unique design and purpose, this structure plays a crucial role in flood control and water retention in the region. Understanding the intricacies of its ownership, regulation, and maintenance provides valuable insights into the complexities of managing water infrastructure in a changing climate. As efforts continue to assess and improve the condition of Sodus 4 S, it serves as a reminder of the importance of sustainable water resource management for communities and ecosystems alike.