Ontario Highway 21, also called King's Highway 21, is a provincialhighway in southwestern Ontario, Canada. It starts near Ontario Highway 402, almost half way between Sarnia and London. It runs north/northeast for 227 kilometres (141 mi) and ends in Owen Sound with Highway 6, Highway 10, and Highway 26.[2] The roadway is referred to as the Bluewater Highway because it remains very close to the eastern shoreline of Lake Huron.[3] It was started in 1927 as Highway 3 running across Kent and Lambton Counties.[2] In 1930 it was extended and renamed King's Highway 21.[2] It is one of Ontario's most treacherous roads for winter driving. Highway 21 is frequently closed during winter because of snow blowing off Lake Huron.[4]
↑Whipp 1983, p. 31. sfn error: no target: CITEREFWhipp1983 (help)