Lake Wallula

Lake Wallula is a reservoir on the Columbia River in the United States, between the U.S. states of Washington and Oregon. It was created in 1954 with the construction of McNary Dam. It reaches from McNary Dam near the city of Umatilla, Oregon, to the Tri-Cities of Washington. The Wallula Gap is a prominent geological feature of Lake Wallula, and has been recognized by National Park Service as a National Natural Landmark, as a site that provides an important illustration of the geological history of the United States.