Image from Wikimedia Commons is by RuthAS
Image from Flickr is by Airviews Photography
Aqueduct in fully open position allowing the ship to pass through.
Image from Flickr is by Ted Milton
The aqueduct in closed position allowing the boat to cross over the Manchester Canal. Originally it had a towpath along its length about 2.7 m (9 feet) above the water level but it was subsequently removed.
Image from geograph.org.uk is by Peter Whatley
Image from Panoramio is by Adventures of Kara
Nearby Swing Road Bridge
Image from Flickr is by War Head
An explanatory video of the swing action.
Source of info and more info: Wikipedia / Engineering Timelines
View location in Google Earth / Google Maps (3D View) / MSN Bing Bird's Eye View