A hydraulic canal which paralleled the Ohio Canal along Locks 10 through 14. Carried water from the Little Cuyahoga River near the foot of Bank Street along the edge of the hills to Lock 5 at what is now Mill Street and from that point down to Lock 17 in the valley. In that short distance the descent was precipitous enough to allow the water to plunge downward and be used to power machinery. Much of the race had to be blasted out of solid rock in the hills. Some of it runs through a series of large stone tunnels as it goes through the canal valley. These stone tunnels pass under what is now Ace Rubber, under North Street and under ABTEC before the race flows back into the Little Cuyahoga River near Lock 15.