Manzanita Diversion, also known as Manzanita Lake, is a private hydroelectric structure located in North Fork, California. Built in 1917, this concrete dam stands at a height of 30 feet and has a length of 205 feet. With a storage capacity of 168 acre-feet and a maximum discharge of 1500 cubic feet per second, it plays a crucial role in managing water resources in the area.

Managed by the Federal Energy Regulatory Commission, Manzanita Diversion is state-regulated and subject to inspections, permitting, and enforcement. The dam's primary purpose is hydroelectric generation, utilizing the flow of the North Fork Willow Creek to produce energy. Despite its high hazard potential, the risk assessment for this structure is moderate, indicating a manageable level of risk.

As a key component of the region's water infrastructure, Manzanita Diversion serves as both a water storage facility and a source of renewable energy. With its historical significance dating back over a century, this dam continues to play a vital role in water resource management and climate resilience efforts in California.