The Dalles Lock and Dam


The Dalles Dam was built by the U.S. Army Corps of Engineers in 1952-57. At 260 feet high and 8,875 feet long, it is the longest concrete and fourth largest power-producing dam in the U.S. The hydroelectric facility produces enough electricity to serve a city the size of Seattle. Located at the head of the slackwater pool created by Bonneville Dam, it impounds a reservoir that provides ship passage 25 miles upstream to John Day Dam. Visitors can take a train ride from Seufert Park Interpretive Center to tour the powerhouse, fish ladder, and petroglyphs.

Activity Details

Activity Type:Trips and Destinations
Discipline:Civil, Environmental
Topic(s):Electricity
Grade:K-2, 3-5, 6-8, 9-12
Time:Full day

Fun Fact:The dam extends 1.5 miles from the Oregon shore to the navigation lock on the Washington shore. Because the boundary between the two states follows the old river channel, The Dalles Dam is almost entirely in the state of Washington.
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