Enjoyable bimble through pleasant countryside, beware of the occasional tree. The whitewater interest lies in the second half of the run where a few rapids liven up the approach to Calder Bridge. It is possible to continue past Calder Bridge, taking in some unusual sandstone gorges. Possible takeouts are a) at a public footpath which goes down to the river, or b) continuing through the Sellafield nuclear site down to the sea. Note that there are a couple of grade 4 rapids through Sellafield which are made all the more interesting by their unique location.
Thornholme Farm can be reached from Calder Bridge by turning off the Cold Fell road as it zig-zags up a steep hill. There isn't much parking, but make sure to leave access for farm traffic. There is a large car park on your left as the Cold Fell road enters Calder Bridge.
Rainchasers is best experienced as an app.