Lake In The Hills 3 Dam, located in McHenry, Illinois, is a concrete buttress dam completed in 1940 with a primary purpose of recreation. Managed by the local government, this dam on Crystal Creek has a height of 10 feet and a length of 70 feet, providing a storage capacity of 70 acre-feet. With a low hazard potential and moderate risk assessment, the dam is state-regulated and inspected regularly by the Illinois Department of Natural Resources.

Designed by Wight Consulting Engineers, Lake In The Hills 3 Dam serves as a vital recreational resource for the community, offering opportunities for boating, fishing, and other water-based activities. While the dam does not have any associated structures or outlet gates, it plays a crucial role in managing water flow and ensuring the safety of downstream areas. Despite its age, the dam remains in good condition, with a five-year inspection frequency and a commitment to meeting state regulatory guidelines.

With a controlled spillway type and a maximum discharge capacity of 1550 cubic feet per second, Lake In The Hills 3 Dam is an important piece of infrastructure that contributes to the overall water management system in the region. As climate change continues to impact water resources, the proper maintenance and upkeep of dams like this one are essential to safeguarding both the environment and local communities. By staying proactive in risk management and emergency preparedness, the stakeholders involved can ensure the long-term safety and functionality of this critical water resource.