Hill Annex No. 1 is a private dam located in Itasca, Minnesota, specifically in the area of Snowball Creek. This earth dam, completed in 1920, serves as a tailings storage facility with a height of 65 feet and a length of 1500 feet. With a storage capacity of 910 acre-feet, the dam is regulated by the Minnesota Department of Natural Resources and undergoes regular inspections to ensure its structural integrity and safety.

Despite being classified as having a low hazard potential, Hill Annex No. 1 plays a crucial role in the local water resource management system. The dam is situated in a drainage area of 0.9 square miles and is designed to contain tailings material. Although its exact volume is unspecified, the dam's purpose remains vital for environmental protection in the region, underscoring the significance of the ongoing regulatory oversight and maintenance efforts to mitigate any potential risks or hazards associated with its operation.

Owned and operated by a private entity, Hill Annex No. 1 stands as a testament to the collaborative efforts between public and private stakeholders in safeguarding water resources and maintaining infrastructure resilience in the face of changing climatic conditions. With a comprehensive regulatory framework in place, including state jurisdiction, permitting, inspection, and enforcement protocols, the dam exemplifies a commitment to sustainable water management practices that benefit both the local community and the surrounding ecosystem.