Grace Main is a privately owned dam located in Caribou, Idaho, serving the primary purpose of irrigation. Built in 1908, this Timber Crib type dam stands at a height of 51 feet and has a storage capacity of 1100 acre-feet. The dam, situated on the Bear River, plays a crucial role in providing water for agricultural needs in the region.

Managed by the Idaho Department of Water Resources, Grace Main is regulated and inspected by various state agencies to ensure its safety and compliance with regulations. With a significant hazard potential and moderate risk assessment, the dam's emergency action plan is periodically reviewed and updated to meet guidelines. The dam has an uncontrolled spillway and a maximum discharge capacity of 12500 cubic feet per second, making it an essential piece of infrastructure for water resource management in the area.

The Federal Energy Regulatory Commission oversees the regulatory aspects of Grace Main, highlighting its importance in both irrigation and hydroelectric purposes. With its location in a picturesque setting surrounded by nature, Grace Main stands as a testament to the vital role dams play in water resource management and climate resilience efforts.