Linda and I checked on the dippers this morning (1-11-2018) between about 9:00 and 9:30.
Linda observed 1 unbanded bird singing and foraging upstream from bridge 1.
I observed both the banded male from bridge 3 last year as well as the banded female from bridge 1 last year. They were together at bridge 3. Lots of singing. Both birds flew to the nest box, at separate times. The male carried nesting material to the nest box.