I walked all the bridges today ( April 2, 2014), saw only one dipper at bridge 3.
calling briefly, mostly quiet, doing lots of preening, not dipping, some foraging.
It flew down river. did some more foraging, dipping, calling. I did not see it come up with any grubs in it’s beaks.
It did not fly under the bridge, nor did I observe any nest building behavior.
I then walked way up to the watershed beyond the last parking lot, past the gate, walked up to the fairy pools, I sat and sketched for awhile, did not see or hear any dippers. G.O.