We crossed at Coutts on July 1. We got into line at 11:00 AM and waited nearly 3 hours to cross into Canada. They had one line open. Don't know what the problem was.
In the future, this site might be handy:
http://www.cbsa-asfc.gc.ca/general/times/menu-e.html
We exported, then imported with absolutly no trouble except getting back into line after going in to export.
Tim