Foster No. 1 Dam 1a (2nd Enl.) is a privately owned earth dam located in Park, Wyoming, along the Sage Creek. Built in 1953 by designer Howard F. Bell, this dam primarily serves the purpose of irrigation, with a storage capacity of 783 acre-feet. Standing at a height of 24 feet, the dam spans 465 feet in length, providing essential water resources for the surrounding area.

Despite being classified as having a low hazard potential, the dam is regularly inspected and maintained, with the last assessment conducted in August 2019 showing a fair condition. The dam features an uncontrolled spillway with a width of 20 feet and a single valve outlet gate. While the risk assessment is moderate, with a rating of 3, the dam has not had any significant modifications or emergency preparedness measures in place, indicating a need for continued monitoring and potential updates to ensure its safety and efficacy in the face of changing climate conditions.

Situated in a picturesque location and playing a crucial role in supporting local agriculture through irrigation, Foster No. 1 Dam 1a (2nd Enl.) stands as a testament to the importance of sustainable water resource management in the region. With its historical significance and ongoing commitment to regulatory compliance and maintenance, this dam serves as a vital infrastructure asset for the community, highlighting the intersection of water resource management and climate resilience in the Wyoming landscape.