Terry Lake in Larimer, Colorado, stands as a historic Earth dam completed in 1890 primarily for irrigation purposes. With a height of 38 feet and a storage capacity of 9,960 acre-feet, this reservoir on Dry Creek-Tr is a vital water resource in the region. The dam's spillway, uncontrolled in nature, has a width of 300 feet, making it a significant structure in managing water flow.

Despite being privately owned, Terry Lake is subject to state regulation, permitting, inspection, and enforcement by the Colorado Division of Water Resources. With a high hazard potential and satisfactory condition assessment, the dam poses moderate risk, prompting the need for effective risk management measures. The surrounding area boasts a surface area of 500 acres and a drainage area of 4 square miles, making it a crucial site for both irrigation and recreation activities. Enthusiasts of water resources and climate can appreciate the historical significance and functional importance of Terry Lake in the water management landscape of Colorado.