Wayne.B wrote:
Anything over 4 or 5 feet (I forget which) requires advance
written approval by the canal authority, and a waiver on
your part.

According to http://www.cruising.ca/trent/

"Average width for Trent Severn Waterway is of 32 feet.
Minimum width occurs at Port Severn with 23' and Big Chute
at 24'. Maximum vertical clearance height for Trent Severn
Waterway is 22 feet"

Do you think I'll have trouble getting through in a catamaran
with a 21' beam and 3.5' draft ?