Green Peter Dam, located on the Middle Santiam River in Oregon, was completed in 1967 by the US Army Corps of Engineers for flood risk reduction, hydroelectric power generation, irrigation, navigation, and recreation purposes. The gravity dam stands at 320 feet tall and has a storage capacity of 430,000 acre-feet, covering a surface area of 3,720 acres. Despite being classified as having a high hazard potential, a recent risk assessment conducted by USACE in 2020 deemed the dam's risk level to be low, with no immediate need for modifications or short-term measures.

USACE continues to monitor and evaluate the condition and risks associated with Green Peter Dam through routine inspections and advanced studies. The dam is equipped with instrumentation for performance monitoring and seismic activity detection. In the event of an earthquake, post-earthquake procedures are in place for inspection and evaluation of any damages. The Emergency Action Plan (EAP) for Green Peter Dam outlines emergency response procedures, and USACE is committed to updating the EAP based on the latest risk assessment results and inundation maps, as well as increasing community awareness of flood risks and dam-related risks.

Although the Willamette Valley dams, including Green Peter Dam, play a crucial role in reducing flood risks for the region, they cannot completely eliminate the potential for flooding during extreme weather events. USACE remains confident in the structural integrity of the dams and their ability to mitigate flood risks, but acknowledges the possibility of flooding downstream in communities along the South Santiam River in the event of extreme rainfall or snowmelt.