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68 ° 36' 18" N, 152 ° 48' 1" W
1526 ft (465.12 m)
flows NE to Ayiyak River at Horseshoe Mtn., 43 mi. NW of Anaktuvuk Pass, Arctic Slope. 5 miles long.
Named about 1950 by I. L. Tailleur, U.S. Geological Survey (USGS), because of the abundance of Chert along the stream.
Castle Mountain, Fortress Mountain, Hatbox Mesa, Horseshoe Mountain,
Aucella Creek, Canoe Creek, Castle Creek, Chert Creek, Fortress Creek, Notch Creek, Speedway Creek,