Rattlesnake Canyon, also known as Rattlesnake Reservoir, is a vital water resource located in Tustin, California. Owned by a public utility, this dam serves multiple purposes including flood risk reduction, irrigation, and water supply. Completed in 1959, the earth dam stands at a height of 79 feet and has a storage capacity of 1480 acre-feet, making it a crucial component of water management in the region.

Managed by the California Department of Water Resources and regulated by the Safety of Dams agency, Rattlesnake Canyon is subject to state permitting, inspection, and enforcement to ensure its safety and functionality. With a drainage area of 2.02 square miles and a surface area of 60 acres, this reservoir plays a significant role in managing water resources in Orange County. Despite its high hazard potential, the dam is assessed to be in satisfactory condition as of the last evaluation in September 2017.

Rattlesnake Canyon's proximity to Rattlesnake Creek and its strategic location in the Los Angeles District underline its importance in water management and conservation efforts. The dam's emergency action plan is regularly updated to meet guidelines, ensuring that it can effectively respond to any potential risks or emergencies. As a key element in California's water infrastructure, Rattlesnake Canyon stands as a testament to the state's commitment to sustainable water resource management in the face of a changing climate.