Thief Valley is a Federal-owned dam located in Oregon along the Powder River, designed by the Bureau of Reclamation and completed in 1931 for the primary purpose of irrigation. This Buttress-type dam stands at 66 feet high with a storage capacity of 20,495 acre-feet and a surface area of 807 acres. The dam plays a vital role in managing water resources in the region, with a high hazard potential due to its location and design.

Managed by the Bureau of Reclamation, Thief Valley undergoes regular inspections to ensure its structural integrity and safety. Although the condition assessment is currently unavailable, emergency action preparedness is a key consideration for this dam, given its high hazard potential. The dam's importance for irrigation and water management in the area highlights the need for ongoing monitoring and risk management measures to protect surrounding communities and infrastructure.

Thief Valley's location in Union, Oregon, under the jurisdiction of the Portland District, emphasizes its significance in regulating water flow and storage along the Powder River. With a history dating back to the early 20th century, this dam continues to fulfill its purpose of providing critical water resources for irrigation while facing the challenges of aging infrastructure and potential hazards. As water resource and climate enthusiasts, understanding the role and management of dams like Thief Valley is essential for sustainable water management practices in the face of changing environmental conditions.