 In the area of Dębinek, a new weir was built so as to bring waters from Noteć river to the "Kanał Górnonotecki" and a new lock in Nakło West was constructed.Works of Ernst Conrad Peterson were of such high quality, that for decades the canal carried on its operations without any additional extensive repair, except for the replacement of 15–20 years old wooden lock elements.From 1840 to 1852, two new massive granite-brick locks were built