Question: What Montana river was a dam built on under the Columbia River Treaty?
Sentence (from "Columbia River Treaty"): The long-term impacts of the treaty have been mixed: while the dams have provided enormous economic benefits to British Columbia and the U.S. Pacific Northwest through hydroelectric generation and flood control, there are longstanding concerns regarding social and economic impacts to the local communities, and the environmental effects associated with the construction and operation of large dams.
Relevant evidence: No