River Reservoir #3, located in Apache, Arizona, along the Little Colorado River, was completed in 1896 for irrigation purposes. Managed by a private entity, this rockfill dam stands at 58 feet in height and has a storage capacity of 3195 acre-feet, with a normal storage level of 2146 acre-feet. The reservoir covers a surface area of 164 acres and has a maximum discharge rate of 24,000 cubic feet per second.

The dam's spillway, with a width of 300 feet, is uncontrolled, and the outlet gates are also uncontrolled. Despite being rated as having a high hazard potential, the dam is in satisfactory condition as of the last assessment in October 2017. The Arizona Department of Water Resources regulates River Reservoir #3, ensuring compliance with state permitting, inspection, and enforcement requirements. With its historical significance and vital role in irrigation, this reservoir serves as a crucial water resource in the region.

River Reservoir #3's location in the beautiful South Fork area, its association with the USDA NRCS as the designer, and its strategic position along the Little Colorado River make it a noteworthy destination for water resource and climate enthusiasts. Its efficient storage capacity, moderate risk assessment rating, and ongoing regulatory oversight by the Arizona Department of Water Resources highlight its importance in the region's water management infrastructure. Whether for irrigation, recreation, or ecological purposes, River Reservoir #3 remains a key player in sustaining water resources in Apache County, Arizona.