Grade 2/3 leads down to the Mount Severn weir. This is a bit tricky, falling steeply onto rock and then funnelling through a slot, but can be portaged easily.
Takeout in Llanidloes, just downstream of the main bridge on river right. To reach the putin head up minor roads on river left through Glan-y-nant to the bridge at Old Hall.
Rainchasers is best experienced as an app.