Mcarthur is a state-regulated dam located in Boundary County, Idaho, near the city of Naples. Built in 1967, this earth dam stands at a height of 14.7 feet and has a hydraulic height of 10.2 feet. With a storage capacity of 1,085 acre-feet and a surface area of 266 acres, Mcarthur serves various purposes, including flood control and water supply management for the Deep Creek and Kootenai River.

This dam poses a high hazard potential and has been assessed to be in fair condition as of August 2020. The spillway is controlled with a width of 44 feet, and the outlet gates consist of slide (sluice gate) mechanisms. Mcarthur's risk assessment is classified as very high (1), highlighting the importance of proper maintenance and emergency preparedness measures. Despite its age, Mcarthur continues to play a crucial role in water resource management within the region.

Overall, Mcarthur is an essential infrastructure in Idaho, providing vital water resource management functions for the surrounding area. With its fair condition and high hazard potential, ongoing inspections and risk management measures are crucial to ensure the safety and stability of this dam in the face of changing climate conditions. Water resource and climate enthusiasts will appreciate the strategic importance of Mcarthur in maintaining the ecological balance and water security of the region.