Phlox is a gravity dam located on the Red River in Langlade, Wisconsin, with a primary purpose of recreation. Completed in 1878, this historic structure stands at a height of 25 feet and has a length of 275 feet, providing a maximum storage capacity of 390 acre-feet. With a drainage area of 13 square miles and a maximum discharge of 1854 cubic feet per second, Phlox serves as a significant water resource in the region.

Maintained by the Wisconsin Department of Natural Resources, Phlox is regulated, permitted, inspected, and enforced by state authorities to ensure its safety and functionality. The dam's hazard potential is deemed significant, but its condition assessment as of 2015 was satisfactory. Despite being at risk for emergencies, the risk management measures are not explicitly stated, indicating a need for further evaluation and preparedness in case of high-risk scenarios.

With a very high-risk assessment and a controlled spillway design, Phlox serves as a crucial structure for water management and recreational activities in the area. Its historical significance, combined with its modern regulatory oversight, highlights the importance of balancing preservation and safety in water resource management for both environmental and community benefits.