A piece of infrastructure used to divert water from the St. Mary River to the North Fork of the Milk River has suffered a “catastrophic failure,” according to Milk River Project personnel. The failure involves the St. Mary River Siphon, which is composed of a pair of 90-inch riveted steel barrels that traverse a 3,200-foot section of the St. Mary Valley to divert water to the North Fork of the Milk River.
