Nashua Milldam, located in Nashua, Iowa along the Cedar River, was completed in 1917 and serves as a recreational site for water resource and climate enthusiasts. Managed by the local government, the dam stands at a height of 20 feet with a gravity design and rock foundation. With a storage capacity of 5,242 acre-feet and a surface area of 405 acres, the dam provides opportunities for leisure activities in the surrounding area.

Despite its low hazard potential and satisfactory condition assessment, Nashua Milldam is regulated by the Iowa Department of Natural Resources, with state permitting, inspection, and enforcement in place to ensure its safety and functionality. The dam features a controlled spillway with a width of 260 feet, and its risk assessment indicates a very high level of risk, possibly due to its age and the potential impact of climate change on water levels in the Cedar River. As a site of historical significance and natural beauty, Nashua Milldam continues to be a popular destination for outdoor enthusiasts and water resource advocates alike.