There are more, depending on your definition of an island or of a bridge:
Harvard Island:
http://www.wikimapia.org/#lat=43.700...16&l=0&m=a&v=2
Unnamed island about 450m NNW of Harvard Island:
http://www.wikimapia.org/#lat=43.704...16&l=0&m=a&v=2
Is it a bridge or a conduit? The water is two feet deep. It's eight feet wide, with a four foot clearance. You could row a boat under the road.
http://www.wikimapia.org/#lat=43.720...16&l=0&m=a&v=2
There's a walking bridge to this island at Silver Sands Marina:
http://www.wikimapia.org/#lat=43.581...17&l=0&m=a&v=2