Upper Salmon Falls Dam, also known as Snake River Diversion/B-Plant (Upper) Diversion, is a private-owned concrete gravity dam located in Gooding, Idaho. Completed in 1937 by EBASCO, this dam serves primarily for hydroelectric purposes, with a normal storage capacity of 600 acre-feet and a maximum discharge of 48,000 cubic feet per second. The dam stands at a height of 23 feet with a hydraulic height of 32.3 feet and a length of 1620 feet, controlling the flow of the Snake River.

Managed and regulated by the Federal Energy Regulatory Commission, Upper Salmon Falls Dam has a controlled spillway with a width of 730 feet and is equipped with six Tainter (radial) outlet gates. Despite its low hazard potential, the dam poses a very high risk due to its age and lack of updated condition assessment information. With a drainage area of 32,200 square miles and a surface area of 50 acres, the dam plays a crucial role in water resource management and hydroelectric power generation in the region.

Water resource and climate enthusiasts will find Upper Salmon Falls Dam to be a significant structure in the Snake River basin, providing both recreational opportunities and essential energy production. Its historical significance, coupled with its current risk management challenges, highlight the importance of ongoing monitoring and maintenance to ensure the safety and sustainability of this vital infrastructure in Idaho.