Forestry is the main activity in this small valley; recreational tourism, second.

The surface of the Brock River is generally frozen from the beginning of December until the end of March; however, safe circulation on the ice is generally done from mid-December to mid-March, except the rapids areas.

The water level of the river varies with the seasons and the precipitation; the spring flood occurs in March or April.

This source is located at 0.9 kilometres (0.56 mi) northeast of the summit of Mont Gagnon (altitude: 849 metres (2,785 ft)), at 2.7 kilometres (1.7 mi) to the southwest from the summit (altitude: 755 metres (2,477 ft)) of Mont Écho, and 8.1 kilometres (5.0 mi) east of the village center of Sutton.

The toponym "Brock River" was formalized on September 1, 1983 at the Commission de toponymie du Québec.