Binational treaty governing Columbia River dam operations, enabling shared hydroelectric and flood control benefits between Canada and the United States.
Key Facts
- Treaty signed
- 1961
- Dams constructed
- 4 (3 in BC, 1 in Montana)
- Canadian dams
- Duncan, Mica, Keenleyside
- U.S. dam
- Libby Dam, Montana
- Canada's power share
- 50% of downstream U.S. power benefits
By the Numbers
Location
Cause → Event → Consequence
Growing demand for hydroelectric power and flood control in the Pacific Northwest and British Columbia prompted Canada and the United States to negotiate a coordinated approach to developing the upper Columbia River basin, where unilateral dam construction would have been less efficient and potentially harmful to both nations.
The Columbia River Treaty was signed in 1961, establishing a framework for joint development of dams in the upper Columbia River basin. Four major dams were subsequently built under its provisions, with Canada receiving half of the downstream U.S. power and flood control benefits in exchange for constructing and operating upstream storage reservoirs.
The treaty delivered substantial hydroelectric generation and flood control benefits to British Columbia and the U.S. Pacific Northwest, but its long-term legacy has been contentious. Local communities faced social and economic disruptions, and the large dams caused significant environmental damage, generating ongoing debate about the treaty's net impacts.
Political Outcome
Treaty ratified; four dams built; Canada receives half of downstream U.S. power and flood benefits in exchange for upstream storage operation.