Blackstone River waterfall? -

I remember going to this large brick building on a fairly large river (I think its the Blackstone River), and right next to the building was a really loud waterfall. Its in either Blackstone MA or Woonsocket RI. If not, definitely one of the surrounding towns but im 99% sure it was one of those two towns. Im just trying to figure out where it is on a map, and OR pictures.

I think you are thinking about Pawtucket, RI. There are a series of old brick buildings along the banks of the Blackstone River, one of which is an old hydroelectric plant that was refurbished in the early 1980s. for use as the business office for Blackstone Valley Electric Company.

I know there is one in South Grafton on the Blackstone river, another in Worcester, Uxbridge also has one, not so sure about Northbridge. There are many old mill towns on the Blackstone River, all of them have man-made waterfalls in which the energy was used to power the mills which were almost entirely made of brick