This route crosses the Homer M. Hadley floating bridge using a bike/pedestrian path that was part of the original bridge construction and enables human-powered crossing of Lake Washington. At 1,772m in length, it's the fourth longest floating bridge in the world.
After the bridge crossing, the route circumnavigates Mercer Island, a suburban community occupying the island. The east side of the island is a twisting set of turns from south to north. The ride finishes up by crossing through the village of Beaux Artes and south Bellevue (the second largest city in Washington State), then travels back across the north end of Mercer Island and the Homer Hadley bridge.