Johnson Dam, located in Ida Grove, Iowa, was completed in 1996 by the USDA NRCS and serves multiple purposes including fire protection and as a small fish pond. The dam is of earth type construction with a height of 28 feet and a length of 265 feet, providing a storage capacity of 20 acre-feet and covering a surface area of 1 acre. It is situated on the TR- MAPLE RIVER and is owned by a private entity.

The dam has a low hazard potential and a moderate risk assessment rating. It has not been inspected or assessed for condition, and there is no Emergency Action Plan in place. Despite its small size and limited capacity, Johnson Dam plays a vital role in water resource management in the area, serving as a source of water for fire protection and supporting local biodiversity through its function as a fish pond. Enthusiasts of water resources and climate will find this structure intriguing for its design and multi-functional use in a rural setting.