Grade 2 interspersed with small broken weirs. One weir just after the A472 is larger and a possible portage.
Putin at the bridge in Argoed, just north of Blackwood/Coed Duod on the A4048. Takeout at Wattsville, just upstream of Risca: take a small road swinging back down to river left just downstream of the A467 bridge.
Rainchasers is best experienced as an app.