We went up the road from Mount to Jemima yesterday. It was labelled as Devious Mt. Rd. on Google Earth and on my buddy's Treo-based GPS software. His unit also showed that we passed west of "Lake Broyhill" and he got a kick out of it when I mentioned this discussion.
If you go to the NJDEP GIS website and download the 1930 aerial photos of NJ and look just to the East of where maps locate Lake Broyhill, you will see a fairly sizeable pond on the upper stretches of a tributary of the Tulpehocken. Was that "Lake Broyhill"? The world may never know....