Ontario Highway 31

Highway 31
A map of Highway 31, in red (as of March 31, 1997)
Route information
Maintained by Ministry of Transportation of Ontario
Length	76.93 km[1] (47.80 mi)
Existed	July 2, 1927[2] – January 1, 1998[3][4]
Major junctions
South end	Highway 2 in Morrisburg
Major intersections	Highway 401  Highway 43 in Winchester  Highway 16 in Ottawa  Highway 417 (Queensway) in Ottawa
North end	Chaudière Bridge at the Quebec boundary in Ottawa
Location
Country	Canada
Province	Ontario
Counties	Stormont, Dundas and Glengarry
Regions	Ottawa–Carleton
Major cities	Ottawa
Towns	Morrisburg, Winchester
Highway system
Ontario provincial highways Current Former 400-series
← Highway 28 → Highway 33
Former provincial highways ←  Highway 30 Highway 32  →

King's Highway 31, commonly referred to as Highway 31 and historically known as the Metcalfe Road, was a provincially maintained highway in the Canadian province of Ontario. The 76.93-kilometre (47.80 mi) route connected Highway 2 in Morrisburg with the Chaudière Bridge at the Ontario–Quebec boundary in downtown Ottawa.

Established in 1927, Highway 31 originally extended from Highway 2 north to the Stormont, Dundas and Glengarry – Carleton county line. It was extended into Ottawa in 1936, and had several routings through the city over the years. The southern terminus was altered with the construction of the St. Lawrence Seaway in 1958, and a bypass of Winchester was opened in 1974. The entire highway was decommissioned in 1997 and 1998, and transferred to lower levels of government. It has since been known as Stormont, Dundas and Glengarry (SDG) County Road 31 outside of Ottawa, and Ottawa Road 31 and several local names within Ottawa, notably Bank Street and Bronson Avenue.