Located in Angus, Minnesota, the Angus-Oslo 4 dam is a vital structure designed for flood risk reduction along the Red River-TR. Completed in 2000, this earth dam stands at a height of 22 feet with a hydraulic height of 18 feet, serving as a crucial defense against potential flooding in the region. With a storage capacity of 8,068 acre-feet and a surface area of 960 acres, the dam plays a pivotal role in managing water flow and mitigating flood risks in Polk County.

Managed by the Minnesota Department of Natural Resources, the Angus-Oslo 4 dam is subject to regular inspections and maintenance to ensure its structural integrity and functionality. Classified as having a low hazard potential and a satisfactory condition assessment, the dam is equipped with an uncontrolled spillway with a width of 4,800 feet to manage excess water discharge effectively. Despite its moderate risk assessment rating, the dam continues to be a reliable asset in the local government's efforts to protect the community from potential flooding events.

As a key component of the flood risk reduction infrastructure in Minnesota, the Angus-Oslo 4 dam stands as a testament to effective water resource management and climate resilience. With its strategic location and design, this earth dam serves as a critical barrier against flooding along the Red River-TR, safeguarding the surrounding areas and populations from the impacts of extreme weather events. Through regular oversight and maintenance, the dam remains a valuable asset in the state's efforts to enhance water security and adapt to changing climate conditions.