Lock 4 Illinois Michigan Canal January 14, 2016January 14, 2016 / canalman Lock 4 Lock 4 Lock 4 Lock 4 is located south of Lock 3 in Joliet. It is accessed through the Joliet Iron Works Park. There are no gates in the lock. The walls are not original. Water flow is brisk. Share this: Click to share on X (Opens in new window) X Click to share on Facebook (Opens in new window) Facebook Like Loading... Related