Mesa Creek #3, also known as Mesa Lake or Fish Lake, is a privately-owned irrigation structure located in Mesa, Colorado. Built in 1890, this Earth dam stands at a height of 20 feet and has a storage capacity of 400 acre-feet, primarily used for irrigation purposes. Despite being in fair condition, with a significant hazard potential, the dam has undergone structural modifications in 1970 to ensure its continued functionality.

Situated on Mesa Creek, this dam plays a crucial role in water management in the region, with a normal storage capacity of 239 acre-feet and a maximum discharge of 325 cubic feet per second. The dam also serves recreational purposes and spans a length of 140 feet, with a spillway width of 12 feet. The inspection frequency for Mesa Creek #3 is every two years, with the last assessment conducted in June 2020, indicating a moderate risk level.

Owned by private individuals, this dam is regulated by the Colorado Department of Water Resources and is subject to state permitting, inspection, and enforcement. With a designated emergency action plan, Mesa Creek #3 remains a vital component of the local water infrastructure, ensuring water availability for irrigation and recreational activities while managing the risk associated with its significant hazard potential.