Is this a spot where the river runs through a narrow cut in the mountains to the left? If so, the river valley might be a real wind tunnel. The bridge sides would provide shelter for anyone on the bridge.
Forgive me for being a crusty old New Englander, but if it doesn't have a cover on it, it's not really a covered bridge, is it?
It takes an iron man to play with a toy iron horse.
Below is a link to some information, although I don't know about the claim that it is the only covered bridge remaining in Canada. It the claim is for railway bridges, perhaps they are correct, but I know for a fact that there are other covered bridges, many in use.
http://www.greatnorthernempire.net/index2.htm?GNEBridgesBC.htm
Well, the trusses are roofed over, even if the floor isn't.
I'll admit that, to me, a covered bridge is one that has a complete structural enclosure and the trusses visible inside. Seems to me that the Red Bridge could have had a complete roof at a considerable saving of material (siding used on the floor side of the trusses.)
Chuck (modeling Central Japan in September, 1964)