Little Payette Lake Main, also known as Little Payette Main Dam, is a privately owned structure located in Lake Fork, Idaho. Built in 1926, this earth dam stands at a height of 25 feet and has a hydraulic height of 16 feet. With a storage capacity of 10,300 acre-feet and a surface area of 1,450 acres, the dam primarily serves the purpose of irrigation in the region.

Managed by the Idaho Department of Water Resources, the dam has a controlled spillway with a width of 84 feet and a maximum discharge of 3,000 cubic feet per second. Despite being classified as having a high hazard potential, the dam is currently in fair condition, as assessed in September 2020. The risk assessment for the structure is deemed very high, reflecting the importance of ongoing monitoring and maintenance efforts.

Situated in a picturesque setting along the Little Payette Lake and Lake Fork river, this dam plays a critical role in water resource management in Valley County, Idaho. With its historical significance and vital contribution to irrigation in the area, Little Payette Lake Main serves as a focal point for water resource and climate enthusiasts who are passionate about sustainable water infrastructure.