Johnson Dam, located in Davis County, Iowa, is a privately owned Earth dam designed by the USDA NRCS and completed in 1972 for purposes including fire protection and small fish pond management. The dam stands at a height of 32 feet and spans 328 feet, with a storage capacity of 34 acre-feet. Despite its low hazard potential and moderate risk assessment, the dam has not been rated for its current condition.

Managed by the Iowa DNR, Johnson Dam is subject to state regulation, permitting, inspection, and enforcement. It sits along the TR-North Fork North Fabius River and serves as a vital water resource for the surrounding area. While its spillway type is listed as uncontrolled, the dam has not been modified in recent years and lacks outlet gates.

Although Johnson Dam has not undergone a recent condition assessment or Emergency Action Plan (EAP) preparation, its vital role in water management and conservation in the region makes it a noteworthy structure for water resource and climate enthusiasts to monitor and study.