North Branch Au Sable River
General data
- Name: North Branch Au Sable River
- Water system: St. Lawrence River
- Water type: River
- Progression: Au Sable River -> Lake Huron -> St. Clair River -> Lake St. Clair (North America) -> Detroit River -> Lake Erie -> Niagara River -> Lake Ontario -> St. Lawrence River -> Gulf of St. Lawrence -> Atlantic Ocean -> Planet Earth
- Climates: Continental
- Continents: North America
- Countries: United States of America
The North Branch Au Sable River in Michigan is a renowned, high-quality cold-water stream famous for its premier fly fishing, particularly for wild trout populations. It is known for its scenic beauty, clear water, and rich history in angling conservation.
The North Branch originates near Otsego Lake in Otsego County and flows southeasterly. It eventually joins the Mainstem Au Sable River downstream from where the South Branch enters.
It is a major destination for anglers nationwide and is often considered one of the finest brown trout fisheries east of the Rockies. The river also hosts populations of brook and rainbow trout.