From the viaduct the river starts at grade 2, building to beautiful continuous grade three through pine-forest. The main event of the trip (grade 4) comes up suddenly and eddies are limited. Best option is scout/portage left.
Ample parking is available at the obvious put-in; the huge (and picturesque) viaduct at the end of the road. Follow the road south taking two left turns (the second being a tight switchback to reach the takeout bridge.
Rainchasers is best experienced as an app.