Arco Dam, located in Silver Lake, Iowa, was completed in 1968 by the USDA NRCS and is owned and regulated by a private entity. The dam serves multiple purposes, including fire protection and as a small fish pond, with a storage capacity of 233 acre-feet and a surface area of 9 acres. It is situated on the TR-West Branch Little Sioux River and has a low hazard potential, making it a vital resource for the surrounding community.

Managed by the Iowa DNR, Arco Dam is an earth-filled structure with a height of 29 feet and a length of 511 feet. Despite being uncontrolled, the spillway type ensures water release in case of overflow. The dam's risk assessment is moderate, indicating the need for ongoing monitoring and maintenance to ensure its safety and effectiveness in managing water resources in the region.

For water resource and climate enthusiasts, Arco Dam offers a fascinating example of how private entities and state agencies collaborate to manage water infrastructure. With its unique design and multi-purpose functionality, the dam stands as a testament to sustainable water management practices in the region. Its low hazard potential and moderate risk assessment highlight the importance of ongoing inspections and risk management measures to safeguard this critical resource for future generations.