The Par Canal.

Treffry built the Par Canal to serve the harbour by canalising 2.25 miles (3.6 km) of the river and digging a new river channel slightly to the east.

There was an entrance lock to the canal at the harbour, and then two more between there and its terminus at Pontsmill, north of St Blazey. From here inclined planes carried tramways to Fowey Consols mine and Colcerrow quarry. The latter line was expanded northwards and over the Treffry Viaduct and also was eventually brought right into the harbour.

Some china clay was carried by the canal, it being loaded into open containers at the works to ease transshipment at Pontsmill.

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