Bob writes:

Bridge 3 still has young being fed in the nest on Tues 24th. I had a moment this morning to look under Main St and watched a Dipper make 3 trips to the downstream nest hole with something in its mouth. Then it flew to the upstream nest box and took away a fecal sac. Heard the young inside.

So perhaps the Main St pair are planning a second nest in the drain pipes under the bridge fdl