Pit #1 Diversion, located in Fall River Mills, California, is a privately owned structure that plays a crucial role in flood risk reduction and hydroelectric power generation along the Fall River. Completed in 1922, this gravity dam stands at a height of 15 feet and has a storage capacity of 50 acre-feet. With a low hazard potential and a satisfactory condition assessment, Pit #1 Diversion is regulated and inspected by the California Department of Water Resources to ensure its safety and effectiveness in managing water resources in the region.

Despite its age, Pit #1 Diversion continues to serve its primary purpose of flood risk reduction, showcasing the enduring engineering ingenuity that went into its design and construction nearly a century ago. With a drainage area of 676 square miles and a surface area of 9 acres, this dam plays a significant role in regulating water flow and mitigating potential flood events in the surrounding area. Additionally, its proximity to the Fall River makes it a vital component of the local water infrastructure, highlighting its importance in maintaining water security and ecological balance in the region.

As a key feature in the water management system of Shasta County, Pit #1 Diversion stands as a testament to the enduring impact of early 20th-century engineering on modern-day water resource management. With its historical significance, functional efficiency, and ongoing regulatory oversight, this gravity dam continues to play a crucial role in safeguarding communities and ecosystems against the threat of flooding while also supporting sustainable hydroelectric power generation in the region.