 Route of Highway 31 in 1936, showing the original northern terminus at the Dundas-Carleton County Boundary Excerpt from the 1936-1937 Official Ontario Road Map - Courtesy of Queen's Printer for Ontario - © 1936 |
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 Route of Highway 31 in 1938, showing the highway after the route was extended north to Ottawa in 1936 Excerpt from the 1938-1939 Official Ontario Road Map - Courtesy of Queen's Printer for Ontario - © 1938 |
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 Dual routes of Highway 31 through Ottawa in 1958, showing the Rideau Canal Scenic Route and the Bank Street Route Excerpt from the 1958 Official Ontario Road Map - Courtesy of Queen's Printer for Ontario - © 1958 |
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 Route of Highway 31 through Ottawa in 1992 along Bronson Avenue to the Ottawa Queensway (Highway 417) Interchange Excerpt from the 1992-1993 Official Ontario Road Map - Courtesy of Queen's Printer for Ontario - © 1992 |
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 Route of Former Highway 31 as it appears today Map Courtesy of Bing Maps (Retrieved May 14, 2010) - Link to this map at Bing Maps |
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