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The USGS serves as the lead agency for the United States to measure and apportion natural flows of the St. Mary and Milk Rivers according to the Boundary Waters Treaty of 1909 and the International Joint Commission Order of 1921. The division of water between the United States and Canada is overseen by the Accredited Officers of the St. Mary and Milk Rivers, who are appointed by their respective governments.
The United States’ share of water is primarily used by the U.S Bureau of Reclamation - Milk River Project, which diverts St. Mary River water into the Milk River watershed.
The project, locally known as “the lifeline to the highline,” meets the needs of residents and industry along the Northern Tier of Montana to:
Annual Report to The International Joint Commission on The Division of Waters of the St. Mary and Milk Rivers
International Joint Commission
Current Streamflow Conditions in Montana
Water Survey Canada