The Concord River Falls in N. Bill. has a similar dam which is a long granite span. But, it also has a short concrete piece like this one with a concrete facade just beyond a short brick wall (wall being a 90 degree angle). Do you think this was a spillway? If it is a spillway --one cannot see where water enters ???The concrete looks out of place with the original 1830 granite. There is a separate water "flue" for conveying water to the mill.
on Jan 10
I lived in Dracut (collinsville)about 30 years ago. 143 Varnum Rd to be exact. I remember Beaver Brook. Nice to know some things don't change.