bh016453 Safety bulkhead in south heading of tunnel during construction, Waterworks Park, Detroit water supply system
bh016462 Workers pouring concrete for screen chamber foundation slab, Waterworks Park, Detroit water supply system
bh016467 Timbering of south heading of tunnel during construction, Waterworks Park, Detroit water supply system
bh016468 Timbering of south heading of tunnel during construction, Waterworks Park, Detroit water supply system
bh016470 Timbering of south heading of tunnel during construction, Waterworks Park, Detroit water supply system
