There are two Erie Canals - New York and Ohio. For either one, which section do you plan to bike?
Ohio bike trail map:
https://www.ohioanderiecanalway.com/plan/maps/
Recommended sections: Either Cuyahoga Valley NP, or the very short ride from Bolivar to Zoar... (Zoar is worth visiting, if you're down that way.)
New York bike trail map:
https://www.ptny.org/cycle-the-erie-canal/trail-map
FWIW, I think the Ohio one is better, but I'm biased.