Willow Creek Dam is located in Morrow County, Oregon, directly upstream from the town of Heppner, and about 45 miles south of Hermiston.
Willow Creek Dam was completed in 1983. It is the first major dam in the United States constructed using the roller-compacted concrete technique. The dam is 169 feet high and 1,780 feet long, and was constructed with 403,000 cubic yards of concrete. The reservoir is able to store 9,765 acre-feet of water.
The Portland District operates the project for flood control and irrigation with incidental benefits for recreation, sportfishing, and wildlife.