College #3, also known as Brd of Agriculture #3 or College Lake, is a state-owned earth dam located in Larimer, Colorado. Built in 1919, this dam serves primarily for irrigation purposes with a storage capacity of 1461 acre-feet. Situated along the Cache La Poudre River, this dam supports various functions including fire protection, stock, small fish ponds, and fish and wildlife habitat.

With a height of 18 feet and a length of 1075 feet, College #3 has a spillway width of 231 feet and a maximum discharge of 2976 cubic feet per second. Its hazard potential is classified as high, though the dam's condition has been assessed as satisfactory. Regular inspections and maintenance ensure the dam's reliability and safety, with the last inspection occurring in September 2020. Despite moderate risks associated with its operation, College #3 continues to play a vital role in water resource management and climate resilience in the region.

As a key infrastructure within the state-regulated water system, College #3 underscores the importance of effective governance and management in ensuring water security and mitigating potential hazards. With its historical significance and ongoing role in supporting agriculture and ecosystems, this dam stands as a testament to the intersection of water resources, climate adaptation, and sustainable development in Colorado's landscape.