This is actually a pretty popular paddling site. Most people put in at the Blackstone Gorge and paddle up to the Millville Lock, built in 1828 by the Blackstone Canal. Even by the very conservative standards of the Blackstone River Valley National Heritage Corridor this is a “beginner” trip.
I’ve paddled it many times. There is a short rapid in Millville that I run, but most people turn around before they get there. Here is a video of the trip from a couple of years ago - it was a cloudy/hazy morning, so some of the clips are a little blurry.
A beginner could definitely get into trouble running the Millville Rapids, but it looks like this strainer was on the flatwater section further downstream - I’ll have to go check it out sometime.