Overholser is a significant earth dam in Oklahoma City, Oklahoma, built in 1919 across the N. Canadian River for water supply purposes. The dam stands at an impressive 61 feet in height and spans 17,100 feet in length, with a storage capacity of 31,100 acre-feet and a normal storage level of 15,000 acre-feet. The reservoir created by Overholser covers an area of 1,500 acres and serves as a vital water resource for the region, with a drainage area of 738 square miles.

Despite its age, Overholser remains a key component of the local water supply infrastructure, with a controlled spillway and a maximum discharge capacity of 193,013 cubic feet per second. However, the dam is classified as having a high hazard potential and poor condition assessment, indicating the need for ongoing maintenance and potential upgrades to ensure its structural integrity. The risk assessment for Overholser is rated as very high, highlighting the importance of proactive risk management measures to safeguard the surrounding communities and water resources in the event of an emergency.