Dippers at Loggerheads

We took Laddie to Loggerheads in North Wales again this morning and saw a Dipper again in exactly the same place as last time (by the bridge over the river on the main foot path)... except this time there were 2 of them! And it very much looked to me like they were building a nest under the bridge somewhere. I don't know if that is where a Dipper is likely to build a nest, I will certainly endeavour to find out and will definately pop back in May to see if there are any fledglings around.