Britannica
Sources used in this answer
When was the Columbia River Treaty signed and ratified?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
Columbia River
Columbia River Gorge, Oregon-Washington border.
The Columbia River Treaty was signed on January 17, 1961. It was subsequently ratified by the United States on March 16, 1961, and by Canada on September 16, 1964.1