Mom gives us a little tour of the Saginaw River in Bay City on the local river walk trail. We pass the burned, sunken hulls of ships from the 19th-Century Davidson shipyard. A Great Heron catches fish in a marshy inlet. A freighter works its up the river, passing under the city’s four drawbridges. It’s a good walk as well a peek into Bay City’s natural, logging, and maritime history.