- St. Mary River
The Saint Mary River is a
tributary of theSaskatchewan River . The river together with theBelly River andWaterton River drains a small portion ofMontana to theHudson Bay watershed.The river rises as a stream on
Gunsight Mountain in Glacier National Park and flows into Gunsight Lake, then flows intoSt. Mary Lake , exits the park and flows on intoLower St. Mary Lake in theBlackfeet Indian Reservation . From the reservation, the St. Mary River flows intoAlberta and into theSt. Mary Reservoir . It flows into theOldman River which eventually reaches the Saskatchewan River.It passes near the cities of
Cardston, Alberta andLethbridge ,Alberta .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 2060 km (1280 miles) of canals and pipelines to approximately 1,505 km² (372,000 acres) of land south of the Oldman and South Saskatchewan Rivers between Lethbridge and
Medicine Hat, Alberta .
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