Bob L F:
1 arch bridge
Bob L F:
4 arch bridge
Bob L F:
2 arch bridge
Bob L F:
4 arch bridge
Bob L F:
Charles Eliot memorial bridge
Bob L F:
Northboro aqueduct
Bob L F:
Paul's Bridge
Bob L F:
korbelled 2 arch bridge
Bob L F:
RR bridge pilings
Bob L F:
Railroad bridge