Johnson Dam, located in Lucas County, Iowa, is a privately owned earth dam with a primary purpose of fire protection, stock, or small fish pond. Built in 1972 by the USDA NRCS, this dam stands at a height of 31 feet and spans 295 feet in length, with a storage capacity of 38 acre-feet. The dam is regulated by the Iowa DNR and undergoes regular inspections to ensure its safety and compliance with state regulations.

Situated on TR-WHITEBREAST CREEK near RED ROCK RESERVOIR, Johnson Dam serves as a recreational site in addition to its primary functions. The dam has a low hazard potential and a moderate risk assessment rating, indicating a manageable level of risk. While the dam's condition assessment is currently listed as "Not Rated," it is subject to periodic inspections and enforcement to maintain its integrity and safeguard against potential hazards.

Despite being a private structure, Johnson Dam plays a crucial role in water resource management in the region, providing storage capacity, fire protection, and recreational opportunities. With its strategic location and functional design, the dam serves as a vital asset for the community while contributing to the overall sustainability of the area's water resources and climate resilience efforts.