I observed the Main st nest for one hour from 8:30am to 9:30, Saturday April 27. One fledgling has left the nest and I observed the Male parent feed this bird 6 times. He also brought food up to the nest 3 times. The fledgling was observed at first directly below the nest on the rocks awaiting its feeding. It then moved to the upstream side of the tunnel as the male foraged upstream.
I went down to the Water Street bridge and observed the Female placing nesting material on the new nest.
I will try to get back this afternoon. Bob
American Dipper on Flickr