Blackstone Canal
Just south of Mineral Springs Ave at remaining upper gate pocket of Lock 5
12/4/12

Blackstone Canal
Remaining upper gate pocket of Lock 5 and approach wall to right
12/4/12

Blackstone Canal
Upstream end of wall of Lock 5
12/4/12

Diagram of the lock wall in PAL Report to the Grafton Land Trust of February 2007
Note that there is some stone to the left of the vertical line "A"