Located in Crook County, Oregon, Allen Creek is a privately-owned dam primarily used for irrigation purposes. Completed in 1959, this dam stands at a height of 78 feet and has a hydraulic height of 76 feet. With a storage capacity of 2189 acre-feet, Allen Creek serves as a vital water resource for the surrounding area, with a drainage area of 12.36 square miles.

The dam features an uncontrolled spillway and slide gates for outlet control, with a maximum discharge of 750 cubic feet per second. Despite being classified as having a low hazard potential, the risk assessment for Allen Creek is moderate, indicating the need for ongoing monitoring and risk management measures. The dam is regulated and inspected by the Oregon Water Resources Department, ensuring compliance with state requirements for operation and maintenance.

Although the condition assessment for Allen Creek is currently listed as "Not Rated," regular inspections are conducted every 6 years to assess the structure's integrity and safety. With its strategic location in the watershed and its critical role in irrigation, Allen Creek remains a key feature in the water resource management of the region, providing essential water supply for agricultural and environmental needs.