The property was once a dairy farm, with dikes to hold back the river water (and the tides), and create grazing land for the cows. It's a beautiful spot, currently chock full of Canada geese looking for nesting spots.
I loved the pair of white dairy barns. From this viewpoint, you couldn't tell there were two identical barns, but the trail eventually led to a viewing platform right next to them.
for more information, see Nisqually National Wildlife Refuge