The U.S. Cavalry used enlisted Apaches and Yavapais to maintain peace between the community and the Army. The average salary of a scout was $100 per month. In the late 1800s, scouts were used to pursue escaped Apaches from the San Carlos military camp near present day San Carlos. Old San Carlos is located in the bottom of present-day Collidge Dam that was built in 1912. Scouts were crucial in providing critical data to the Army by monitoring the movement of Apaches and the Yavapai in Verde Valley.