This river flows in forested area in a valley encircled by Notre Dame Mountains.

From its source (47°06′58″N 69°49′37″W / 47.116°N 69.827°W / 47.116; -69.827 (Rivière Saint-Roch source)), in L'Islet Regional County Municipality, the river runs south and southeast across the Canada–United States border in Maine Township 15, Range 15, WELS, to the Big Black River in T 14, R 15.

The upper part of the "Saint Roch River" begins in Notre Dame Mountains, in the municipality of Sainte-Perpétue, Chaudière-Appalaches, Quebec in the L'Islet Regional County Municipality (RCM).

This confluence is located: The place name "Saint-Roch River" was formalized on December 5, 1968, at the Commission de toponymie du Québec (Quebec Places Names Board).

[2] Media related to Shields Branch at Wikimedia CommonsDownload coordinates as: