OK so we need rules
It must be from the mainland, leaves out Birch-Steamboat and others.
It must be to a natural island, not a penisular with a man-made water crossing. Leaves out Bizer's third and Belkins.
The bridge must carry autos. Leaves out Bizer's other three including Silver Sands and a bunch of small docks and foot bridges connecting tiny islands. There's probably ten in the Weirs channel alone.
The bridge must still be here. Leaves out half mile island and Stonedam.
Natural island is the weakest rule because I'm sure that definitive history to prove some of these is lost. Do we need any other rules to get the answer to be six?
Is it ice-out yet ?