Located in La Plata, Colorado, Johnson Reservoir, also known as Lake Durango, is a private water supply dam designed by HARRY GOFF and completed in 1982. The dam stands at a height of 41 feet, with a hydraulic height of 46 feet and a structural height of 55 feet. With a storage capacity of 1320 acre-feet and a surface area of 55 acres, Johnson Reservoir serves as a vital source of water for the surrounding area.

Managed by the Colorado Division of Water Resources, Johnson Reservoir is regulated and inspected regularly to ensure its safety and structural integrity. The dam has a spillway type of Uncontrolled, with a spillway width of 102 feet to manage potential overflow. Despite being classified as having a high hazard potential, the dam's condition assessment currently rates as fair, indicating a moderate risk level. The dam's emergency action plan (EAP) was last revised in February 2017, demonstrating proactive measures in place for emergency situations.

With its strategic location on the Coal Gulch-TR river system and its essential role in water supply, Johnson Reservoir is a key component of Colorado's water infrastructure. As a private dam, it plays a crucial role in water management and supports the local community's water needs. Enthusiasts of water resources and climate will find Johnson Reservoir an intriguing example of sustainable water management practices in action, highlighting the importance of dam safety and regulation in ensuring water security for the region.