actually stream beds and anywhere there is water action are great places to find chert, IF, it is part of the geology of the area.
Rhode Island? not a clue! but i will googlefoo it and find out.
I wouldn’t count on finding too much along the beach, I’ve tried doing so near Madison and Plymouth. I always have better luck when I’m searching a steam bed.
Odds are low. Maybe, maybe, better luck closer to a historical harbor location. As someone mentioned, you might luck into some old ship's ballast.
Misquamicut or Charlestown?