At the end of the sixties, securing the interests of the citizens became of paramount importance. The City Traffic Commission of National Council determined that in the years 1971-1975 Bydgoszcz would face the escalating traffic congestion problems even outside rush hours with traffic jams expected to grow by 100% over the course of five years. The operating speed in Bydgoszcz was measured at 18 km/h, which constituted the lowest speed in the country. Interesting results were recorded for Grunwaldzka Street where between 400 to 800 vehicles passed each hour. The number of green areas in the city were on the increase, which accelerated even further the unfavourable social and economic atmosphere surrounding the park area. As a result of the above aura, works to redevelop one of the most beautiful sites in Bydgoszcz were started and between the years 1970-1973 the old part of the canal was eventually filled in.

                 As early as in November 1970 the plans to cut down the trees between Grottgera and Wrocławska Streets and to reclaim the land, dredge the canal and install an interceptor on it were announced. 300 trees between Wrocławska and Grottgera Streets were cut down very fast. During the dredging process, an unexploded subsoil ordnance was a possible threat and the work had to be put on hold until bomb technicians secured the area. At the same time, the traffic on Władysław IV Bridge was limited and ultimately forbidden due to the risk of collapsing. The plans included the installment of a military bridge as well but in the end it was decided to reconstruct the old bridge. After the necessary reinforcements were done, on 16th of January 1971 the bridge at Grunwaldzka Street over the Old Canal was reopened. Soon the bridge was tested and it was open to trams and buses again letting them return to their old routes. It was announced that the bridge would be used until Grunwaldzki Hub is created.
                In August 1971 the construction of a sewage system and further filling in of the canal commenced.  Additionally, intense works to widen Nakielska Street were carried out. The Old Bydgoszcz Canal was filled in completely at the end of 1971 whereas the works on covering Władysław IV Bridge were finished between 1972 - 1973. After that, the road surface was laid for Grunwaldzkie Roundabout. In the eighties, due to further deterioration of the remaining part of the Old Canal, it was hinted to cover it completely. Fortunately, the authorities opted for the reconstruction of the locks and cleaning of the bottom of the canal. All works were carried out in the nineties. 

                   Almost 40 years after the Old Canal was filled in, the city is once again returning to its water. To this effect many initiatives in the city are taken, one of which is the Central Europe Programme REURIS project: Revitalisation of Urban River Spaces that let for the restoration of the Old Bydgoszcz Canal between Wrocławska Street and Grunwaldzkie Roundabout.