Dozens of intriguing wooden posts jut out of the aquamarine water by the historic CN Rail swing bridge in Atherley Narrows and in the distance alongside Shotgun Island. But they’re actually bridge footings and not the ancient Indigenous fish weirs that make this Ontario spot a national historic site. Those are buried in protective layers of silt here in the shallow waters where Lake Couchiching and Lake Simcoe meet. Standing on an old steel trestle structure from the railway era that overlooks the channel, I wish I could have visited either 5,000 years ago or a few years from now if an ambitious rethink of the area succeeds.