Ontario Highway 21

Ontario Highway 21, also called King's Highway 21, is a provincial highway 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. The roadway is referred to as the Bluewater Highway because it remains very close to the eastern shoreline of Lake Huron. It was started in 1927 as Highway 3 running across Kent and Lambton Counties. In 1930 it was extended and renamed King's Highway 21. 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.

Bluewater Highway
Highway 21 highlighted in red
Route information
Maintained by the Ministry of Transportation of Ontario
Length	226.8 km (140.9 mi)
Existed	May 23, 1927–present
Major junctions
South end	Highway 402 near Wyoming
Major intersections	Highway 8 in Goderich  Highway 9 in Kincardine
North end	Highway 6 / Highway 10 / Highway 26 in Owen Sound
Highway system
Ontario provincial highways Current Former 400-series
← →
Former provincial highways      →

Ontario Highway 21 Media

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  Southbound Highway 21 and northbound Highway 6 are concurrent in Owen Sound, the only example of a wrong-way concurrency in the provincial highway network.

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  Highway 21 near Petrolia. A Bowstring Arch bridge was constructed to replace the existing county-built bridge shortly after the department designated Highway 21.