St. Mary's Dam Provides Water to Hi-Line Again

St. Mary Siphon bringing water to thousands of Montanans again, ahead of schedule

Catastrophic failure took place just a little more than one year ago.

St. Mary's dam provides water to Hi-Line again

Ahead of schedule, water began flowing again to thousands of Montanans along the Hi-Line Wednesday following a multi-million-dollar update to the St. Mary Diversion Dam and Canal.

Milk River To Receive Water Again After Siphons Fixed - Bridge City News - June 27, 2025

The St Mary Diversion Dam in Montana has restarted after more than a year since the siphons burst, preventing any substantial water flow from travelling through the Milk River. The siphons diverge water from the St Mary River to the Milk River to provide irrigation water across Alberta and Montana. It burst open in June of last year, which tore through the hill and returned water back to the St Mary River. Repairing the site cost $70 million but…