I spent a couple of hours looking for dippers on Thursday morning, 3-1-2018.
I started around 8:30 and ended around 10:30.
I saw 5 birds.
1) at the Fairy pond area above the park I saw 2 birds fly up stream together.
2) at bridge 1 I saw the orange female. No sign of a second bird.
3) at bridge 3 I saw the blue male and an unbanded bird flying to the nest several times with nesting materials (photos attached).
No sign of birds at Main Street or Hersey Street.
American Dipper on Flickr