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Ivishak River
Upper Ivishak River Valley.jpg
Upper Ivishak River Valley
Country United States
State Alaska
Borough North Slope
Physical characteristics
Main source Philip Smith Mountains
Brooks Range
5,258 ft (1,603 m)
River mouth Sagavanirktok River
55 miles (89 km) south of Prudhoe Bay
538 ft (164 m)
Length 95 mi (153 km)
Type: Wild
Designated: December 2, 1980

The Ivishak River[pronunciation?] is a 95-mile (153 km) tributary of the Sagavanirktok River in the North Slope Borough of the U.S. state of Alaska. Fed by glaciers at the headwaters, the Ivishak flows northeast, then northwest, through the Philip Smith Mountains and the northern foothills of the Arctic National Wildlife Refuge. It enters the Sagavanirktok River on the coastal plain south of Prudhoe Bay.

On December 2, 1980, 80 miles (129 km) of the Ivishak was designated a National Wild and Scenic River. The protected segments, including the headwaters, an unnamed tributary from Porcupine Lake, and all but the lowermost part of the main stem, lie within the wildlife refuge.

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