Warren Diversion, located in Valley, Idaho, is a privately owned irrigation structure on Big Creek and Payette River that was completed in 1924. With a dam height of 19 feet and a hydraulic height of 13 feet, this earth dam with stone core serves the primary purpose of irrigation within the region. The diversion has a storage capacity of 100 acre-feet and covers a surface area of 25 acres, supporting a drainage area of 56 square miles.

Despite being categorized as having a significant hazard potential, Warren Diversion is currently in fair condition as of the last assessment in July 2018. Inspections are conducted every four years to ensure the structure's safety and integrity. With a very high risk assessment ranking, it is important to monitor and manage any potential risks associated with the diversion to protect the surrounding community and environment. Overall, Warren Diversion plays a crucial role in water management and agriculture in the Cascade area of Idaho.