The canal is no longer navigable, and is maintained by the Environment Agency as a main drainage channel.

The canal is only partially watered and is no longer navigable.

The creek is now silted in and no longer navigable.

Today the canal is overgrown and no longer navigable.

The old canal is no longer navigable.

From the Middle Ages until the 19th century the river had ports for seagoing vessels but is no longer navigable.

The river is no longer navigable above Lock 4 at Frankfort.

By 1900, the stream was no longer navigable.

The old entrance along the seawall has been filled in and is no longer navigable.

Water erosion has caused silting of rivers, and many are no longer navigable.