Okeson is a private water resource located in Campbell, Wyoming, specifically in the city of Arvada. This reservoir, completed in 1945, serves multiple purposes including fire protection, stock watering, and as a small fish pond. It has a dam height of 36 feet and a storage capacity of 110 acre-feet, with a normal storage level of 88 acre-feet. The reservoir is situated on the Oliver Draw river and is regulated and inspected by the Wyoming State Engineer's Office.

Despite its age, Okeson has a low hazard potential but is currently in poor condition according to a 2018 assessment. The dam has an uncontrolled spillway with a width of 100 feet. The risk assessment for this structure is moderate, with a DSAC assigned date yet to be determined. The reservoir is not under the jurisdiction of any federal agency but is subject to state regulations, permitting, inspection, and enforcement. For water resource and climate enthusiasts, Okeson presents an interesting case of a privately owned dam with multiple uses and regulatory oversight in place.