I was randomly searching the intertubes and ran into this
http://cgi.ebay.com/Pontoon-Bridge-River-Park-Winnipeg-Manitoba-Canada-1913-/300487185654?pt=LH_DefaultDomain_0&hash=item45f66e94f6
a postcard for sale that depicted a pontoon bridge in Winnipeg way back when (would make a really neataro watercolour btw)
so searched for more information on this and ran into
http://cec.chebucto.org/ClosPark/River.html
http://cgi.ebay.com/Pontoon-Bridge-River-Park-Winnipeg-Manitoba-Canada-1913-/300487185654?pt=LH_DefaultDomain_0&hash=item45f66e94f6
a postcard for sale that depicted a pontoon bridge in Winnipeg way back when (would make a really neataro watercolour btw)
so searched for more information on this and ran into
http://cec.chebucto.org/ClosPark/River.html