Tomson Dam, located in Nashua, Iowa, was completed in 1997 and is classified as a private earth dam with a height of 19 feet and a length of 780 feet. The dam serves multiple purposes including fire protection and as a stock or small fish pond, with a storage capacity of 79 acre-feet and a surface area of 4.2 acres. It is regulated by the Iowa Department of Natural Resources and undergoes regular inspections to ensure its safety.

The dam, designed by NRCS, is situated on the TR- Cedar River and is within the jurisdiction of Chickasaw County. Despite its low hazard potential, it has a moderate risk assessment rating. The dam has an uncontrolled spillway type and is equipped with outlet gates. While the condition assessment is currently listed as "Not Rated", the dam meets state permitting and inspection requirements, providing necessary safeguards for the surrounding area in the event of an emergency.

In terms of climate and water resource management, Tomson Dam plays a crucial role in providing water storage and protection for the local community. Its presence helps mitigate the risk of flooding and supports environmental conservation efforts in the region. With its strategic location and design, the dam stands as a testament to sustainable water infrastructure development in Iowa.