Nimbus is a federal structure located in Fair Oaks, California, along the American River. Constructed in 1955, this concrete dam stands at a height of 87 feet and serves multiple purposes, including fish and wildlife pond management, hydroelectric power generation, irrigation, and recreation. Managed by the Bureau of Reclamation, Nimbus has a storage capacity of 8,800 acre-feet and covers a surface area of 540 acres.

With a high hazard potential and a very high risk assessment rating, Nimbus plays a crucial role in water resource management and flood control within the Sacramento region. The dam has a controlled spillway with a width of 720 feet and a maximum discharge capacity of 300,000 cubic feet per second. Despite its age, the condition assessment of Nimbus is currently listed as "Not Available", highlighting the need for regular monitoring and maintenance to ensure its continued safety and functionality.

As a key component of the American River watershed, Nimbus is a significant infrastructure asset that supports the local ecosystem, agriculture, and recreational activities. Climate change and increasing water demands necessitate ongoing vigilance and investment in the upkeep of structures like Nimbus to safeguard water resources and mitigate potential risks to surrounding communities.