The paper presents the usage of the lower Vistula waterway on the basis of the number of floating units passing the Włocławek lock in the period 1997–2016. The Włocławek dam plays an important role in ensuring navigability on the inland waterway on the lower Vistula. The analysis revealed that the number of units locked in the Włocławek dam varied in particular years and was decreasing throughout the whole period. It depended on the serviceability of the lock and the hydrological conditions (water levels, ice phenomena). Throughout the year, water transportation was seasonal. The highest number of passing units falls on summer months (VI–VIII). Regarding the transportation type subdivision, freight traffic dominated over touristic traffic. An exception took place in the years with low water levels (mainly in summer), in which freight traffic was impossible, which resulted in a lack of delivery guarantee. A solution to that problem is the construction of intermodal transshipment ports along the waterway.