Hertha, also known as Seven Lakes, is a privately owned irrigation structure located in Larimer County, Colorado. Managed by the Natural Resources Conservation Service, this Earth-type dam was completed in 1958 and stands at a height of 32 feet with a hydraulic height of 24 feet. With a storage capacity of 2447 acre-feet, Hertha serves the primary purpose of irrigation and covers a surface area of 116 acres. Despite being uncontrolled, the dam has a spillway width of 13 feet to manage potential overflow.

The dam's condition was last assessed in August 2020 and was found to be satisfactory, with a significant hazard potential. Regular inspections are conducted every two years to ensure its structural integrity. The risk assessment for Hertha is moderate, with measures in place to manage any potential risks. Located in the Dry Creek watershed, this dam plays a crucial role in water resource management in the region and contributes to the overall agricultural landscape in Berthoud.

Hertha's presence highlights the importance of efficient water management in the face of changing climate patterns. As a key piece of infrastructure in the Omaha District, this dam showcases the collaborative efforts between private owners, regulatory agencies, and designers to ensure the safety and sustainability of water resources in Colorado. With its storied history and ongoing maintenance efforts, Hertha stands as a testament to the resilience of water structures in the face of environmental challenges.