Boston water works, Sudbury River Conduit, 1876, Division III, Section 10, Waban Valley bridge, south side of "arch A".

Boston water works, Sudbury River Conduit, 1876, Section 10, Waban Valley bridge, view of centering "arch B".

Boston water works, Sudbury River Conduit, Nov. 6th, 1876, Division 1, Section 1, gatehouse showing inlet arch to conduit.