Lower Dunbar Dam, located in Greene, Iowa, was completed in 1996 and serves primarily for recreational purposes. Designed by Eric Horlyk, this earth dam stands at 7 feet high and spans a length of 3200 feet, with a storage capacity of 189 acre-feet. Situated on the TR-WILLOW CREEK, this dam is state-regulated by the Iowa Department of Natural Resources, ensuring its inspection, permitting, and enforcement are in compliance with state regulations.

With a low hazard potential and a moderate risk assessment rating of 3, Lower Dunbar Dam is considered to be in good condition, though it has not been formally rated. Despite its uncontrolled spillway type and lack of outlet gates, this dam provides a vital recreational resource for the community, offering a surface area of 52 acres for various water activities. With its picturesque location and scenic surroundings, Lower Dunbar Dam is a popular spot for water resource and climate enthusiasts to explore and enjoy the outdoors.