Turn left along the narrow canal-side path. Pass Monksmead Swing Bridge; the path broadens as it runs through Crowndale Woods. Quarries on the far bank provided the stone used to build the canal; if the water is low you can sometimes see where the horse-drawn barges (one horse downstream, two horses back up) scarred the stone lining.
The canal runs behind Crowndale Farm; Sir Francis Drake was born in a longhouse here in 1540. Follow the path under a pretty single-arched stone bridge, built to access Wheal Crowndale, which opened in 1799 and produced copper (note blue-green staining on the underside of the bridge) and arsenic, and some tin and iron.
Pass an engraved wooden post bearing MM (Millennium), T (Tavistock) and G (Gulworthy), marking the parish boundary, as the canal curves right at Shillamill; the Rivey Tavy, far below, heads south to join the River Tamar. The canal continues to bear right, now running up the valley of the River Lumburn, and carried over the old road to Bere Alston (now an overgrown track) via an iron bridge. The magnificent Shillamill Viaduct was built in 1889 by the Plymouth, Devonport & South Western Junction Railway, one of four such structures between Plymouth and Tavistock (the line closed in 1968).
Walk on to reach the only lock on the canal, complete with lock-keeper’s cottage, and a dock for tying up barges. Continue over the rock-built aqueduct, towering 60ft (18m) above the River Lumburn.