Seiche: Symbolism and reality in an unlikely urban wilderness

The following story is set in Milwaukee. I hope there are neglected places in your city where similar stories may be told.
 
In the midst of active rail lines and towering industrial buildings, I find the activity of beavers most mysterious. Discovering the little haven of nature in a place so completely altered by humans is itself unexpected. The presence of a beaver, an animal also driven to modify its environment, seems miraculous and symbolic.
 
Against long odds, a wetland remains within the historic estuary of the Milwaukee River.