Not a huge change - a smile rather than a tut when I hear the distinctive sound. The BWCA is a protected area where they really try to keep the water clean. Folks have cabins near the area (heck, some day I'd like a cabin up there) and I was sure someone had a well pump or something that was spinning up sporadically. Changed my perceptions of the noise - rather than assuming I'd failed to get far enough into the wilderness, I came to realize I'm in the thick of it.

Headed back up there in a couple days. Hope to hear the grouse pounding their wings, the moose walking through the water, and a wolf howling away.