Petchulat Dam, located in Johnson County, Iowa, is a private earth dam designed by USDA NRCS and completed in 1993 for fire protection, stock watering, and small fish pond purposes. With a height of 36 feet and a length of 240 feet, the dam has a storage capacity of 78 acre-feet and covers a surface area of 4.9 acres. Situated on the TR-Iowa River in Coralville Reservoir, the dam is regulated by the Iowa Department of Natural Resources and is subject to state permitting, inspection, and enforcement.

Despite its low hazard potential and moderate risk assessment, Petchulat Dam has not been rated for its condition assessment. The dam features an uncontrolled spillway and is primarily constructed on soil foundations. While it has not undergone recent inspections or maintenance, the dam remains in operation for its intended purposes. The surrounding area, which includes the city of Coralville Reservoir, benefits from the water resource provided by the dam for fire protection and agricultural needs.

Water resource and climate enthusiasts would find Petchulat Dam a fascinating example of private dam infrastructure in Iowa, contributing to local water management and ecosystem support. The dam's design by USDA NRCS, state regulation by Iowa DNR, and its critical role in fire protection and stock watering highlight the interconnectedness of water resources, infrastructure, and environmental stewardship. With its location on the TR-Iowa River and its modest storage capacity, Petchulat Dam represents a valuable asset for the community and a reminder of the importance of sustainable water resource management practices.