Claassen Lagoon Dam, located in Jefferson County, Nebraska, is a privately owned earth dam that was completed in 2011. With a height of 28 feet and a length of 1050 feet, this dam serves a primary purpose of "Other" and has a storage capacity of 74.1 acre-feet. The dam is regulated by the Nebraska Department of Natural Resources and undergoes regular inspections to ensure its safety and functionality.

The dam, situated on TR-Cub Creek, has a low hazard potential and is deemed to be in satisfactory condition as of the last assessment in April 2019. With a normal storage capacity of 56.9 acre-feet and a surface area of 4.23 acres, Claassen Lagoon Dam plays a crucial role in managing water resources in the area. Climate enthusiasts will appreciate the role this dam plays in maintaining water levels and supporting the local ecosystem.

Managed by a private owner, Claassen Lagoon Dam is an essential infrastructure in the region, contributing to flood control and water conservation efforts. With its low hazard potential and satisfactory condition, this dam represents a key component in the water management system of Jefferson County, Nebraska, making it a noteworthy site for water resource and climate enthusiasts to explore and study.