It seems likely to me that the McKay/Carter Intergalactic Gate Bridge is a reference to the Macdonald-Cartier Bridge or Freeway given the similarity in name and the show's Canadian connection.
http://stargate.wikia.com/wiki/McKay/Carter_Intergalactic_Gate_Bridge
http://en.wikipedia.org/wiki/Macdonald-Cartier_Bridge
http://en.wikipedia.org/wiki/Macdonald-Cartier_Freeway
TL,DR: The Macdonald-Cartier Bridge and the Macdonald-Cartier Freeway represent connections between Ontario and Quebec (i.e. "English Canada" and "French Canada" -- I assume this was part of the inspiration for the names), not unlike the McKay/Carter Bridge is a connection between the Pegasus and Milky Way Galaxies.
Any direct evidence of this?