Holbrook is a privately owned dam located in Valley, Idaho, along the Little Squaw Creek and Squaw Creek. Built in 1955 by the USDA NRCS, this Earth-type dam stands at 17 feet tall and has a storage capacity of 71 acre-feet for irrigation purposes. With a low hazard potential and satisfactory condition assessment, Holbrook plays a crucial role in managing water resources for agriculture in the region.

Managed by the Idaho Department of Water Resources, Holbrook is subject to state regulation, permitting, inspection, and enforcement to ensure its safety and functionality. The dam has a moderate risk assessment rating and is equipped with an uncontrolled spillway with a width of 12 feet. Despite its age, Holbrook has been maintained to meet regulatory standards, with its last inspection conducted in June 2017, highlighting its commitment to safe water management practices.

Located within the jurisdiction of the Walla Walla District, Holbrook serves as a vital infrastructure for the local community, contributing to the sustainable use of water resources for irrigation purposes. With its strategic design and operational oversight, Holbrook continues to support the agricultural sector in Valley, Idaho, while adhering to state regulations and ensuring the safety of surrounding areas from potential risks associated with dam operations.