The hydrographic slope of the Blondeau River is accessible by the junction of a forest road (east–west direction) serving the north side of Chibougamau Lake; the latter is connected to route 167 which also serves the south side of Waconichi Lake and the Waconichi River.

This last road comes from Chibougamau, going north-east to the south-eastern part of Mistassini Lake.

The surface of the Blondeau River is usually frozen from early November to mid-May, however, safe ice circulation is generally from mid-November to mid-April.

The latter is crossed to the northwest by the Waswanipi River which is a tributary of Matagami Lake.

The mouth of the Blondeau River located at: The toponym Blondeau River was formalized on December 5, 1968, at the Commission de toponymie du Québec, i.e. at the foundation of this commission.