and south of River it can get really rocky & hilly & gnarly! Nadim claims it's "unrunable" but I've run it a bunch.
The section I was referring to as "un-runnable" was between River Rd. and Seven Locks Rd--last time I was there it was way too overgrown with grasses and thorns. The shoulder and new sidewalk were better. South of Seven Locks, it's runnable but pretty hilly and unpleasant.