Barn swallows come to our yard quite a bit. I think it's pleasing to see these guys dip and dive around the yard. I figure they are ridding the yard of insects so I welcome them gladly. I have never really taken the time to determine if they are nesting here or not but I don't believe so. There is a huge building about two blocks from us that would give them ample locations for their nests. There is no immediate water source for them but Puget Sound is about four miles from our yard and we have a river flowing into it at that point. There is also a large clear cut nearby which is bordered by an extensive stand of evergreens.