Simmons, a private dam located in Humphreys, Tennessee, was completed in 1971 and stands at a height of 31 feet with a hydraulic height of 28.6 feet. It holds a maximum storage capacity of 193 acre-feet and covers a surface area of 13.8 acres, with a drainage area of 0.24 square miles. The dam, primarily constructed of earth, spans 650 feet and features an uncontrolled spillway. Despite its significant hazard potential, its condition assessment remains unrated as of the last inspection in January 2016.

The dam on Culvert Branch, under the jurisdiction of the Nashville District, does not have any associated structures or federal agency involvement in its ownership, funding, design, construction, regulation, inspection, or operation. It is not regulated by the state and does not require permitting or enforcement. The risk assessment for Simmons is moderate, with a rating of 3, and it currently does not have an Emergency Action Plan (EAP) in place or meet the guidelines for one. With its historical significance and potential impacts on water resources in the area, Simmons serves as an important structure for water resource and climate enthusiasts to monitor and study.