St. Mary River (Alberta–Montana)

The Saint Mary River is a cross-border tributary of the Oldman River, itself a tributary of the South Saskatchewan River. The Saint Mary together with the Belly River and Waterton River drains a small portion of Montana, in the United States, to the Hudson Bay watershed in Canada.

The river rises as a stream on Gunsight Mountain in Glacier National Park and flows into Gunsight Lake, then flows into Saint Mary Lake, exits the park and flows on into Lower St. Mary Lake in the Blackfeet Indian Reservation. From the reservation, the St. Mary River flows into Alberta and into the St. Mary Reservoir. It flows into the Oldman River which eventually reaches the Saskatchewan River.

It passes near the town of Cardston, Alberta, and the city of Lethbridge, Alberta.

Irrigation

The St. Mary River also provides water for irrigation in Southern Alberta. The St. Mary River Irrigation District (SMRID) is Canada’s largest irrigation district delivering water through 2,060 kilometres (1,280 mi) of canals and pipelines to approximately 1,505 square kilometres (372,000 acres) of land south of the Oldman and South Saskatchewan Rivers between Lethbridge and Medicine Hat.

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Saint Mary's River

The St. Marys River, St. Mary's River, or St. Mary River may refer to:

In Canada:

St. Mary River (British Columbia), tributary of the Kootenay River

St. Mary's River (Nova Scotia), an important Nova Scotia salmon river

In the United States:

St. Marys River (Florida–Georgia), forming a portion of the boundary between Georgia and Florida

St. Marys River (Indiana and Ohio), tributary of the Maumee River

St. Marys River (Maryland), tributary of the Chesapeake Bay

Saint Marys River (Virginia), tributary of the South River

In Australia:

St. Marys River (Tasmania), tributary of Cam River (Tasmania)

Multi-national:

St. Mary River (Alberta–Montana), tributary of the Saskatchewan River in Montana and Alberta

St. Marys River (Michigan–Ontario), connecting Lake Superior and Lake Huron and forming a portion of the international boundary between the U.S. and Canada

St. Mary River (British Columbia)

The St. Mary River (sometimes represented as the St. Mary's River) is a river in the East Kootenay region of British Columbia. It rises in the Purcell Mountains and flows in a generally southeasterly direction to its confluence with the Kootenay River at Fort Steele, British Columbia.