Big Beaver is a privately owned earth dam located in Mesa, Colorado, near the city of Molina. Built in 1947 by designer Frank A. Matteson, this dam serves the primary purpose of irrigation for the surrounding area. With a height of 30 feet and a length of 180 feet, Big Beaver has a storage capacity of 175 acre-feet and a normal storage level of 128 acre-feet.

The dam, situated on Bull Creek-TR, has a significant hazard potential and is classified as having a fair condition assessment as of the last inspection in July 2020. It features an uncontrolled spillway, one slide (sluice gate) outlet gate, and a spillway width of 25 feet. Despite its moderate risk assessment rating, the dam has been deemed safe for operation with state regulation, inspection, and enforcement in place.

Water resource and climate enthusiasts will find Big Beaver an intriguing structure due to its historical significance, efficient irrigation function, and the engineering challenges associated with its design and maintenance. Its location in a picturesque setting in Colorado adds to the allure for those interested in exploring the intersection of human infrastructure and natural resources in the context of water management.