Johnson is a privately owned dam located in Larimer County, Colorado, with a primary purpose of irrigation. Built in 1944, this earth dam stands at a height of 8 feet and has a length of 450 feet. With a maximum storage capacity of 573 acre-feet and a normal storage of 133 acre-feet, Johnson serves as a vital source of water for the surrounding area.

The dam is situated on Slough Creek-TR and is regulated by the Colorado Division of Water Resources. Despite having a low hazard potential, Johnson's condition assessment in 2014 deemed it unsatisfactory. It has a moderate risk rating and is inspected every 6 years. The spillway, with a width of 200 feet, is uncontrolled, and the dam has a maximum discharge capacity of 2600 cubic feet per second.

In the event of an emergency, it is crucial that proper risk management measures are in place for Johnson to ensure the safety of downstream areas. With its historic significance and importance for irrigation purposes, the maintenance and upkeep of Johnson are essential for water resource and climate enthusiasts to monitor and support.