Lake Delhi Dam, located in Hopkinton, Iowa, serves as a recreational haven nestled along the Maquoketa River. Built in 1922, this gravity dam stands at a height of 55 feet and spans 750 feet in length, with a storage capacity of 9,920 acre-feet and a surface area of 440 acres. The dam's primary purpose is recreation, offering locals and visitors alike a tranquil escape for various water activities.

Managed by a private owner, Lake Delhi Dam is regulated and inspected by the Iowa Department of Natural Resources, ensuring its structural integrity and safety for the surrounding community. Despite being classified as having a significant hazard potential, the dam's condition is deemed satisfactory as of the last inspection in July 2020. With a risk assessment rating of very high, measures are in place to mitigate potential risks and ensure the dam's resilience in the face of climate challenges.

As a vital component of the local landscape, Lake Delhi Dam not only provides recreational opportunities but also plays a crucial role in water resource management within the region. With its controlled spillway and rock and soil foundations, this historic dam continues to stand as a testament to engineering ingenuity and environmental stewardship, attracting water resource and climate enthusiasts to appreciate its significance in sustaining the surrounding ecosystem.