The State Enterprise Inland Waterways Directorate is the administrator of the inland waterways of national importance. The Enterprise administers and operates the inland waterways of national importance of the Republic of Lithuania, oversees and performs their maintenance, creates appropriate conditions for navigation in the inland waterways of national importance. The main activities of the Enterprise: Marking fairway of the inland waterways of national importance, its cleaning works, river bed regulation with hydraulic engineering constructions (rip-raps) aiming to form the fairway of definite parameters. Performance of hydrographic works, mapping hydrographic network of the Republic of Lithuania. Service and maintenance of the infrastructure of the inland waterways. Transportation of standard and non-standard oversized cargoes by inland waterways. Shipbuilding and repair.