Forty miles east of Portland, the Bonneville Lock and Dam spans the Columbia River, providing electricity, a navigation lock, fish passage, and recreation areas.
The dam's first powerhouse, spillway, and original navigation lock were completed in 1938 to improve navigation on the Columbia River and provide hydropower to the Pacific Northwest. A second powerhouse was completed in 1981, and a larger navigation lock in 1993.
Lake Bonneville was created behind the dam, and is a popular spot for summer activities like boating and fishing. Fish ladders, part of the original construction, provide pathways for salmon, steelhead, and other native fish navigate past the dam to spawn upstream. Large underwater windows can be found at both the Bradford Island Visitor Center (on the Oregon side) and the Washington Shore Visitor Complex for viewings between April and October.
Both the Bradford Island Visitor Center (Oregon side) and the Washington Shore Visitor Complex are open daily from 9am to 5pm. Guided tours are available year-round, with tour times and availability changing seasonally.