| Gregg River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Alberta |
| Source1 Location: | Gregg River Headwaters |
| Source1 Coordinates: | 53.1222°N -117.4789°W |
| Mouth Location: | McLeod River |
| Mouth Coordinates: | 53.2911°N -117.2811°W |
| Source1 Elevation: | 1489m (4,885feet) |
| Mouth Elevation: | 1161m (3,809feet) |
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.[1]
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.