Trek still had a licensing deal with Greg Lemond in '07, so the frame would've been built by Trek in Waterloo. The Whitewater factory got wound down in '04, I think. Not sure if Lemond production was always in Waterloo, or whether some/all production was in Whitewater for a time.
Awesome, thanks! I've always wondered. I didn't realize Trek was still making steel frames in the US in '07.