Muir Dam, located in Greene County, Iowa, is a privately owned structure designed by the USDA NRCS and completed in 1978. With a primary purpose of fire protection and serving as a stock or small fish pond, this earth dam stands at 30 feet tall and stretches 555 feet in length. The dam has a storage capacity of 60 acre-feet, with a normal storage level of 45 acre-feet and a surface area of 5.7 acres.

Managed by the Iowa Department of Natural Resources, Muir Dam is regulated, permitted, inspected, and enforced by state authorities to ensure its safety and compliance with regulations. The dam poses a low hazard potential and has a moderate risk assessment rating, indicating a moderate level of risk associated with its operation and maintenance. With a spillway type of uncontrolled, the dam does not have outlet gates or associated structures, and its condition is currently not rated.

Water resource and climate enthusiasts can appreciate Muir Dam for its role in fire protection and as a habitat for small fish and wildlife. Located along TR-Greenbrier Creek, this earth dam not only provides essential services but also serves as a key component of the local ecosystem. Its construction and management by the Natural Resources Conservation Service demonstrate a commitment to sustainable water resource management and environmental stewardship in the region.