Millhouse,
these sorts of obstructions are all to common place. If I can't leap over them I use the following strategies.......

The most advanced is what I call the "toss and roll". Get a bit of a running start, say 5 or 10 yards and then toss the canoe over the offending obstacle while immediately thereafter performing a diving somersault under the obstruction. The key is in the reengagement of your canoe. It may take some practice.

Less advanced methods include an appropriately placed karate chop or in very tedious cases a 1/2 stick of dynamite can work wonders.

BTW......glad to hear you had a good trip. Be careful, it can be addicting.  ;)