The International Waterway E70 in Poland runs through 6 voivodships (Zachodniopomorskie, Lubuskie, Wielkopolskie, Kujawsko-Pomorskie, Pomorskie, Warmińsko-Mazurskie). The waterways on this route are managed by 3 Inland Navigation Offices (UŻŚ in Szczecin, UŻŚ in Bydgoszcz, UŻŚ in Gdańsk) and administered by 3 Regional Water Management Boards (RZGW in Szczecin, RZGW in Poznań, RZGW in Gdańsk) and by the Maritime Office in Gdynia.
The Polish section of the E 70 International Waterway consists of the following parts:
- Lower Oder
- Lower Warta, freely flowing
- Lower Noteć, freely flowing
- Lower Noteć canalised
- The Bydgoski Channel
- The channeled estuary section of the Brda River
- Lower Vistula (from the mouth of the Brda River to the Nogat River)
- The Jagiellonian Channel and Elbląg
- The Vistula Lagoon
- The estuary section of the Vistula
The IWW E70 includes the section of the lower reaches of the Oder river, from kilometre 617.6 (Kostrzyn nad Odrą – confluence with the Warta) to kilometre 667.2 (Hohensaaten – the Oder River joining the Oder-Havel canal), the total length of 49.6 km.
The Warta is the third longest river in Poland. For a distance of 68.2 km – from the confluence of the Noteć with the Warta in Santok (at km 68.2) to the town of Kostrzyn nad Odrą (km 0.0), where it flows into the Oder River, the Warta is part of the IWW E70 (free flowing lower Warta).
The 115 km long lower section of the Vistula, from the confluence with the Brda to the Nogat, is a class II navigable waterway, with guaranteed minimum depth of 1.4 m. Along this section, there are no water impounding installations. From here up to its mouth (941.3 km), the Vistula is a waterway of class III and offers a depth of 1.6 m.