Dyke Marsh, Alexandria, VA. Fred standing on the platform at the end of the new Dyke Marsh boardwalk. We hadn't been to Dyke Marsh in several months and were pleased to discover they had rebuilt the boardwalk--very recently from the smell of newly cut wood. That's the new Wilson Bridge in the background. On our hike, we saw 12 American Coots, a Hooded Merganser pair, several Canada geese, a yellow-rumped warbler, cardinals, robins, a yellow shafted northern flicker, a couple pie-billed grebes, a flock of fish crows and several double crested cormorants.