Oneida Main is a captivating water resource infrastructure located in Idaho, specifically in the city of Preston. This concrete dam, completed in 1920, serves multiple purposes including irrigation, hydroelectric power generation, and recreation. With a height of 114 feet and a hydraulic height of 95 feet, this structure boasts a storage capacity of 19,000 acre-feet and a normal storage level of 10,880 acre-feet. The dam is situated on the Bear River and has a controlled spillway with a width of 75 feet, capable of handling a maximum discharge of 74,270 cubic feet per second.

Managed by the Federal Energy Regulatory Commission, Oneida Main is regulated, inspected, and enforced by both state and federal agencies to ensure its safety and functionality. The dam's hazard potential is classified as high, with a risk assessment rating of very high (1), indicating the need for stringent risk management measures. The structure features Tainter (radial) outlet gates and is associated with one other structure, ID00068S001. Despite the lack of available condition assessment data, the dam remains a vital component of water resource management in the region, providing essential water supply for irrigation and power generation.

Enthusiasts of water resources and climate will find Oneida Main to be a fascinating example of engineering ingenuity and environmental stewardship. This historic dam not only plays a crucial role in water storage and flood control but also contributes to sustainable agricultural practices through irrigation support. With its impressive storage capacity, high hazard potential, and meticulous regulatory oversight, Oneida Main stands as a testament to the importance of effective water resource management in the face of changing climate conditions.