I'm looking for historical significance to a bridge being built from
the United States to Canada. But due to Canada's use to the Metric
sytem and U.S. Use of a different sytem a miss calculation occured.
The question i'm asking is, What bridge and info related to the topic

im pretty sure the blue water bridge between    Sarnia (ontario) and
Port Huron (michigan)   that happened, and the americans had to
recalculate.  i beleive that was the case on the 2nd span (put in a
few years ago)  im not sure about the original bridge that has been
across the river for a long time.

Wikipedia on the Blue Water Bridge:  http://en.wikipedia.org/wiki/Blue_Water_Bridge

Especially interesting is the link to the construction history of the
Blue Water Bridges: 
http://www.michigan.gov/documents/constrhistory_16062_7.pdf

Though it does not specifically identify an issue with metric/imperial
measurements, it does discuss several instances of conflict between
Canadian and American stakeholders.