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Ganaraska River
The Ganaraska River flows through Port Hope.jpg
The Ganaraska River flowing through Port Hope to its mouth at Lake Ontario
Ganaraska River is located in Southern Ontario
Ganaraska River
Location of the mouth of the Ganaraska River in southern Ontario
Country Canada
Province Ontario
Region Southern Ontario
  • Northumberland County
  • Regional Municipality of Durham
Physical characteristics
Main source Ganaraska Forest on the Oak Ridges Moraine
Clarington, Regional Municipality of Durham
344 m (1,129 ft)
44°03′15″N 78°36′22″W / 44.05417°N 78.60611°W / 44.05417; -78.60611
River mouth Lake Ontario
Port Hope, Northumberland County
74 m (243 ft)
43°56′30″N 78°17′26″W / 43.94167°N 78.29056°W / 43.94167; -78.29056
Basin features
River system Great Lakes Basin
Basin size 278 km2 (107 sq mi)
  • Left:
    North Ganaraska River

The Ganaraska River is a river in Northumberland County and the Regional Municipality of Durham in Southern Ontario, Canada. It is part of the Great Lakes Basin, and is a tributary of Lake Ontario, which it reaches at the central community of the municipality of Port Hope. The river's name is thought to originate from Ganaraske, the name for the Cayuga village which was located at the current site of Port Hope.


The river begins on the Oak Ridges Moraine in the Ganaraska Forest in the municipality of Clarington, about 1.5 kilometres (0.9 mi) southeast of the junction of Ontario Highway 35 and Ontario Highway 115. It flows southeast past the community of Kendal, takes in the left tributary North Ganaraska River, then turns south to its mouth on the north shore of Lake Ontario.


Portions of the Ganaraska River drainage basin of 278 square kilometres (107 sq mi) extend into the City of Kawartha Lakes; the Township of Cavan–Monaghan, Peterborough County; and the Township of Hamilton, Northumberland County.

Natural history

There have been major conservation efforts in recent years.

It attracts anglers for salmon and trout. The Ganaraska River Fishway, a fish ladder, allows rainbow trout to travel up river to spawn.

Flood of 1980

The river had a flood in 1980, that caused considerable damage to the Port Hope downtown area.

2007.05.30 02 Ganaraska River Port Hope Ontario
Ganaraska River at Port Hope
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