Johnson Dam, located in Fairfield, Iowa, is a private earth dam completed in 1991 with a height of 20 feet and a length of 375 feet. The dam serves multiple purposes including fire protection and creating a stock or small fish pond. With a storage capacity of 63 acre-feet, the dam is situated on TR-Cedar Creek and is regulated by the Iowa Department of Natural Resources.

Despite its low hazard potential, Johnson Dam has a moderate risk rating of 3. The dam has not been rated for its condition assessment, and there is limited information available on emergency preparedness measures, such as the existence of an Emergency Action Plan (EAP) or updated contact information. The risk management measures and potential inundation maps for the dam are also not readily available.

Water resource and climate enthusiasts interested in Johnson Dam should note its significance in providing water for fire protection and recreational activities. The dam's location in Jefferson County, Iowa, along with its regulated status and moderate risk rating, highlight the importance of ongoing monitoring and maintenance to ensure the safety and effectiveness of this essential water infrastructure.