 In 1884, downtown lock ("Śluza Miejska") was rebuilt, with its original trapezoidal shape and its unique operating process.After a successful exploitation of the lower Brda river and the upper canal of Noteċ in fall of 1879, years between 1878 and 1882 witnessed large investments towards the Bydgoszcz Canal and the Vistula-Oder rivers waterway, which allowed