Big Cliff Dam, located on the North Santiam River in Oregon, was completed in 1954 and serves as a key hydroelectric facility managed by the US Army Corps of Engineers. Standing at 172 feet tall with a gravity design, the dam provides essential water storage for the region, with a maximum storage capacity of 5,930 acre-feet. Despite being labeled as a high hazard potential structure, a recent risk assessment conducted by USACE in 2012 categorized the dam's risk level as low.

The risk assessment highlighted potential challenges posed by extreme earthquake events that could damage the spillway gates, leading to uncontrolled releases and downstream flooding. However, USACE has implemented various risk management measures, including routine inspections, instrumentation for monitoring dam performance, and an Emergency Action Plan (EAP) to guide response in emergency situations. The agency also collaborates with local authorities and community members to increase awareness of flood risks and ensure preparedness for any potential events.

While the Willamette Valley dams, including Big Cliff Dam, play a crucial role in reducing flood risks in the region, they cannot completely eliminate the possibility of flooding during extreme weather events. USACE continues to prioritize dam safety and invest in infrastructure maintenance to mitigate risks and safeguard downstream communities from potential flooding impacts.