Wikimedi'Òc

'Keepers of the Gate' historical plaque near Tremont Gatehouse; Lowell, MA; 2012-05-19.JPG - Emw

SWAMP LOCKS VIEWED FROM ACROSS THE ENTRANCE TO THE MERRIMACK CANAL, LOOKING SOUTHEAST- 1976 - Pawtucket Canal, Swamp Locks, Pawtucket and Merrimack Canals, Lowell, Middlesex HAER MASS,9-LOW,9B-9.tif - Fæ

SWAMP LOCKS LOOKING EAST ACROSS SWAMP LOCKS BASIN- 1976 - Pawtucket Canal, Swamp Locks, Pawtucket and Merrimack Canals, Lowell, Middlesex County, MA HAER MASS,9-LOW,9B-7.tif - Fæ

SWAMP LOCKS FROM UPSTREAM, LOOKING EAST- 1976 - Pawtucket Canal, Swamp Locks, Pawtucket and Merrimack Canals, Lowell, Middlesex County, MA HAER MASS,9-LOW,9B-6.tif - Fæ

SWAMP LOCKS, SOUTHERN END OF THE GATEHOUSE, LOCK ENTRANCE IN FOREGROUND- 1976 - Pawtucket Canal, Swamp Locks, Pawtucket and Merrimack Canals, Lowell, Middlesex County, MA HAER MASS,9-LOW,9B-13.tif - Fæ

SWAMP LOCKS AND DAM LOOKING AT UPSTREAM FACE FROM THE SOUTH SIDE OF SWAMP LOCKS BASIN- 1976 - Pawtucket Canal, Swamp Locks, Pawtucket and Merrimack Canals, Lowell, Middlesex HAER MASS,9-LOW,9B-8.tif - Fæ

LOCK GATES AT THE SWAMP LOCKS, SEPARATING THE UPPER AND LOWER LOCK CHAMBERS, SHOWING PADDLE VALVES, LOOKING WEST- 1976 - Pawtucket Canal, Swamp Locks, Pawtucket and Merrimack HAER MASS,9-LOW,9B-12.tif - Fæ

UPPER LOCK CHAMBER OF THE AMP LOCKS LOOKING WEST TOWARD THE UPSTREAM LOCK GATES- 1976 - Pawtucket Canal, Swamp Locks, Pawtucket and Merrimack Canals, Lowell, Middlesex County, MA HAER MASS,9-LOW,9B-11.tif - Fæ

WORM AND SPUR GEARS FOR CONTROLLING THE PADDLE VALVE IN ONE OF THE GATES BETWEEN THE UPPER AND LOWER CHAMBERS- 1976 - Pawtucket Canal, Swamp Locks, Pawtucket and Merrimack Canals HAER MASS,9-LOW,9B-18.tif - Fæ

SWAMP LOCKS AND DAM, LOOKING WEST AT THE DOWNSTREAM SIDE; LOCK CHAMBERS ARE IN THE TREES AT LEFT- 1976 - Pawtucket Canal, Swamp Locks, Pawtucket and Merrimack Canals, Lowell, HAER MASS,9-LOW,9B-10.tif - Fæ

OPERATOR OF CONTROL ROOM, SWAMP LOCKS GATEHOUSE- 1976 - Pawtucket Canal, Swamp Locks, Pawtucket and Merrimack Canals, Lowell, Middlesex County, MA HAER MASS,9-LOW,9B-16.tif - Fæ

PAWTUCKET CANAL- SWAMP LOCKS, TAKEN WHILE CANAL SYSTEM DRAINED- W. Richard Ansteth, Photographer 1975 - Pawtucket Canal, Swamp Locks, Pawtucket and Merrimack Canals, Lowell, HAER MASS,9-LOW,9B-5.tif - Fæ

WORM AND SPUR GEARS FOR CONTROLLING THE PADDLE VALVE IN ONE OF THE LOCK GATES WHICH SEPARATES UPPER AND LOWER CHAMBERS- 1976 - Pawtucket Canal, Swamp Locks, Pawtucket and HAER MASS,9-LOW,9B-19.tif - Fæ

LOCK GATE AND CONTROL VALVE MECHANISMS BETWEEN UPPER AND LOWER CHAMBERS- 1976 - Pawtucket Canal, Swamp Locks, Pawtucket and Merrimack Canals, Lowell, Middlesex County, MA HAER MASS,9-LOW,9B-17.tif - Fæ

WORM AND SPUR GEARS FOR CONTROLLING THE PADDLE VALVE IN ONE OF THE GATES BETWEEN THE UPPER AND LOWER CHAMBERS- 1976 - Pawtucket Canal, Swamp Locks, Pawtucket and Merrimack Canals HAER MASS,9-LOW,9B-20.tif - Fæ