bh016401 Sheet piling around excavation for screen chamber, Waterworks Park, Detroit water supply system
bh016403 Workers placing concrete in last lift of north stop log shaft, Waterworks Park, Detroit water supply system
bh016407 Shoe and reinforcing steel for lower portion of concrete caisson, Waterworks Park, Detroit water supply system
bh016408 Steel sheet piling around excavation for screen chamber, Waterworks Park, Detroit water supply system
bh016410 Reinforcing steel around screen chamber caisson, Waterworks Park, Detroit water supply system
bh016412 Concrete caisson being sunk for tunnel construction shaft, Waterworks Park, Detroit water supply system
bh016413 Workers placing concrete in second lift of screen chamber, Waterworks Park, Detroit water supply system
bh016414 Form for third lift of construction shaft caisson, Waterworks Park, Detroit water supply system
bh016422 Timbering for north transition of south stop log shaft, Waterworks Park, Detroit water supply system
bh016423 Workers posing among timbering for north transition of south stop log shaft, Waterworks Park, Detroit water supply system
