At bridge 3 in 20 minutes the male went to the nest at least 3 times with food but came back out with food and we heard no singing from the nest. He did a little foraging between trips to the nest but mainly seemed to be waiting to try again.
At bridge 1 in 10 minutes the male fed 4 times and there was singing from the nest.
No sight of females at either nest.
Linda and Peter
American Dipper on Flickr