Lake Mary, located in Soda Springs, California, is a privately owned dam designed for flood risk reduction along the Tr Sfk Yuba River. Built in 1926, this earth-type dam stands at 22 feet high and stretches for 600 feet, providing a storage capacity of 172 acre-feet. With a low hazard potential and a satisfactory condition assessment, Lake Mary has been regulated, permitted, inspected, and enforced by the California Department of Water Resources, Safety of Dams division, ensuring its safety and structural integrity.

This tranquil reservoir covers an area of 18 acres and serves multiple purposes, including flood risk reduction, irrigation, and water supply. Despite its modest drainage area of 0.26 square miles, Lake Mary plays a vital role in managing water resources and mitigating potential risks in the region. The dam's last inspection in August 2020 revealed no major concerns, further reinforcing its important role in the community's water management infrastructure.

Managed by private owners, Lake Mary remains a key feature in the landscape of Placer County, California, under the jurisdiction of state regulatory agencies. With its historical significance dating back nearly a century, this dam continues to stand as a testament to responsible water resource management and climate resilience in the face of evolving environmental challenges.