The Gregg River is a short river in west-central Alberta, Canada. The river is named after John James Gregg (1840–1941), a prospector and trapper prominent in the area.Karamitsanis, Aphrodite (1991). Place Names of Alberta, Volume 1. Calgary: University of Calgary Press, pg. 103
Course The Gregg River forms at the confluence of a number of minor creeks near the Cardinal River Coal Mine, at the base of Mount Sir Harold Mitchell. The river then flows northwest, taking on a number of tributary creeks before joining the McLeod River, which in turn flows into the Athabasca River. The Gregg is bridged by Alberta Highway 40.
Tributaries Berry's Creek Sphinx Creek Drinnan Creek Warden Creek Teepee Creek Wigwam Creek
See also List of Alberta rivers
References