Scrappy but fun. Be careful at the takeout, egress well above the A386 bridge on river right: otherwise you get drawn into the tunnel under the road, and downstream is the unpaddleable Lydford gorge.
Takeout at the A386 bridge north of Tavistock. To reach the putin take the track off the A386 between the Dartmoor Inn and the petrol station up to the river.
Rainchasers is best experienced as an app.