Atlas Feed Mill, also known as Long Trade Lake, is a gravity dam located in Polk, Wisconsin, along the Trade River. Built in 1874 for recreational purposes, this dam stands at a height of 14 feet with a hydraulic height of 11 feet and a structural height of 14 feet. It has a length of 92 feet and a storage capacity of 1610 acre-feet, with a normal storage level of 1100 acre-feet and a drainage area of 45 square miles.

The dam has a significant hazard potential and is classified as having a very high risk level. Despite its fair condition assessment in 2020, the dam has been modified in 1921 and 1994 for various reasons. The last inspection was conducted in November 2019, with a frequency of every 3 years. The dam is state regulated by the Wisconsin Department of Natural Resources (WIDNR) and has state permitting, inspection, and enforcement in place to ensure its safety and compliance with regulations.

With its historical significance dating back over a century and its importance for recreation and hydroelectric purposes, Atlas Feed Mill serves as a vital structure in the region. As water resource and climate enthusiasts, understanding the intricacies of this dam and its management by local government agencies can provide valuable insights into the intersection of water management, infrastructure safety, and environmental stewardship in the area.