Vyshny Volochyok Waterway (Russian: Вышневолоцкая водная система) is a waterway connecting the basins of the Baltic and Caspian Seas, or, more specifically, the Msta River and the Tvertsa River, around the town of Vyshny Volochyok of Tver Oblast, Russia.

On January 12, 1703 Russian Tsar Peter the Great signed a decree which ordered a canal to be built instead of the portage.

However, the construction project contained a number of mistakes, and as a result the canal decayed and some point the navigation became impossible.

Serdyukov built the Vyshny Volochyok Reservoir, which has two outflows, one to Lake Mstino and eventually to the Msta, and another one to the Tvertsa.

[1] Over the 18th century, a number of dams were constructed on the tributaries of the Msta and the Tvertsa, in order to maintain a high level of water needed for navigation.