Twin Granite, also known as Twin Lakes Dam, is a private water resource structure located in Adams County, Idaho. Built in 1920 for irrigation purposes, the dam stands at a height of 24.5 feet and has a hydraulic height of 19.9 feet. With a storage capacity of 600 acre-feet and a surface area of 40 acres, Twin Granite plays a crucial role in managing water resources for agricultural use in the region.

Owned and regulated by the Idaho Department of Water Resources, Twin Granite is classified as a low hazard potential structure with a fair condition assessment. The dam features a controlled spillway with a width of 5 feet and a maximum discharge capacity of 64 cubic feet per second. Despite its age, Twin Granite has undergone regular inspections, with the last assessment conducted in July 2019, ensuring its continued safety and functionality for the community.

Situated along the Twin Lakes and Goose Creek waterways, Twin Granite serves as a vital infrastructure for water management in the area. With its stone core and earth construction, the dam stands as a testament to early 20th-century engineering and continues to play a crucial role in sustaining agricultural activities in the region.