Logan No. 3 is a concrete hydroelectric dam located in Cache, Utah, along the Logan River. Completed in 1924, this dam serves multiple purposes including flood risk reduction, irrigation, and hydroelectric power generation. With a height of 31.5 feet and a length of 108 feet, it has a storage capacity of 40 acre-feet and a surface area of 14 acres.

Managed by the Utah Division of Water Rights and regulated by the Federal Energy Regulatory Commission, Logan No. 3 has a low hazard potential and a moderate risk assessment rating. Despite its age, the dam is regularly inspected and maintained, with the last inspection conducted in June 2016. Emergency action plans are in place, meeting guidelines set by regulatory agencies to ensure public safety in the event of a dam failure.

Situated in a picturesque location near the city of Logan, this dam stands as a testament to early 20th-century engineering and continues to play a crucial role in water resource management and energy production in the region. For water resource and climate enthusiasts, Logan No. 3 offers a fascinating glimpse into the intersection of nature, infrastructure, and sustainable development.