Colter is a privately owned earth dam located in Greer, Arizona, along the Little Colorado River. Built in 1908 for irrigation purposes, the dam stands at 19 feet high and spans 400 feet in length, with a storage capacity of 732 acre-feet. Despite its historical significance, Colter is classified as a high hazard potential structure with a poor condition assessment, last inspected in September 2020.

The dam's spillway is uncontrolled with a width of 40 feet, and it has a maximum discharge capacity of 3300 cubic feet per second. Situated in Apache County, Arizona, Colter is regulated by the Arizona Department of Water Resources and falls under state jurisdiction for permitting, inspection, and enforcement. The risk assessment for Colter is moderate, and emergency action plans and inundation maps are yet to be prepared, raising concerns for the surrounding community's safety in the event of a dam failure.

With its significant role in irrigation and water resource management, Colter serves as a crucial infrastructure within the region. However, its deteriorating condition and lack of updated emergency preparedness measures highlight the need for continued monitoring and maintenance to ensure the safety and integrity of this essential water resource structure.