The Dalles Dam is a hydroelectric dam spanning the Columbia River, two miles east of the city of The Dalles, Oregon, USA. It joins Wasco County, Oregon with Klickitat County, Washington, 192 miles (309 kilometers) upriver from the mouth of the Columbia near Astoria, Oregon. The closest towns on the Washington side are Lyle and Wishram.
The dam is operated by the United States Army Corps of Engineers (US ACE), and the power is marketed by the Bonneville Power Administration.
The reservoir behind the dam is named Lake Celilo, and runs 24 miles (39 kilometers) up the river channel, to the foot of John Day Dam. Slackwater created by the dam submerged numerous rapids above The Dalles, as well as Celilo Falls. The Dalles Dam Visitor Center is located at Seufert Park on the Oregon shore, and was built in 1981. The Horsethief Lake State Park is nearby.
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