Thurston Lake, located in Lamar, Colorado, is a privately owned reservoir primarily used for recreation and irrigation purposes. Built in 1928, this earth dam structure stands at 20 feet high and spans 4000 feet in length, with a storage capacity of 4550 acre-feet. The lake covers 650 acres and is fed by the Arkansas River-OS, making it an important water resource in Prowers County.

The dam at Thurston Lake is regulated by the Colorado Division of Water Resources, with regular inspections ensuring its fair condition and significant hazard potential. In case of emergencies, the dam has an uncontrolled spillway with a width of 100 feet. The lake has a maximum discharge rate of 1560 cubic feet per second and a normal storage capacity of 1714 acre-feet, serving as a crucial water source for the surrounding area. Despite its age, Thurston Lake continues to play a vital role in water management and recreation activities in the region.

With its scenic surroundings and recreational opportunities, Thurston Lake offers a tranquil escape for water resource and climate enthusiasts. From boating and fishing to wildlife observation, this reservoir provides a diverse range of outdoor activities while also serving as a key irrigation source for the local community. As efforts continue to ensure the dam's safety and efficiency, Thurston Lake remains an essential part of Colorado's water infrastructure and a valuable asset for both residents and visitors alike.