Rainbow Diversion, located on Stoney Creek in Colusa, California, is a federal water infrastructure project managed by the Bureau of Reclamation. Completed in 1913, this concrete dam stands at 54 feet tall and stretches 271 feet in length, with a primary purpose of irrigation. With a storage capacity of 100 acre-feet, Rainbow Diversion serves as a crucial component of the region's water management system.

This low-hazard dam features an uncontrolled spillway with a width of 160 feet and has a moderate risk assessment rating. Despite its age, the condition assessment of Rainbow Diversion is currently marked as "Not Available," underscoring the need for regular inspection and maintenance. The emergency action plan for the dam is also listed as not prepared, emphasizing the importance of ensuring the safety and security of this vital water resource in the face of potential climate-related challenges.

As a key structure in the Bureau of Reclamation's portfolio, Rainbow Diversion plays a significant role in supporting agricultural irrigation in the region. With its historical significance and ongoing operational importance, this dam represents a critical piece of California's water infrastructure, highlighting the intersection of water resource management and climate resilience in the state.