 Briar Creek has two named tributaries: East Branch Briar Creek and West Branch Briar Creek. East Branch Briar Creek joins Briar Creek 1.02 miles (1.64 km) upstream of its mouth. It watershed has an area of 15.10 square miles (39.1 km2). West Branch Briar Creek joins Briar Creek 2.74 miles (4.41 km) upstream of its mouth. Its watershed has an area of 12.10 square miles (31.3 km2).
