A swing bridge is a movable bridge that has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the turning span can then pivot horizontally as shown in the animated illustration to the right. Small swing bridges as found over canals may be pivoted only at one end, opening as would a gate, but require substantial underground structure to support the pivot.
In its closed position, a swing bridge carrying a road or railway over a river or canal, for example, allows traffic to cross. When a water vessel needs to pass the bridge, road traffic is stopped (usually by traffic signals and barriers), and then motors rotate the bridge horizontally about its pivot point. The typical swing bridge will rotate approximately 90 degrees, or one-quarter turn; however, a bridge which intersects the navigation channel at an oblique angle may be built to rotate only 45 degrees, or one-eighth turn, in order to clear the channel.
|Cambie Street Bridge Connaught Bridge||False Creek, Vancouver, British Columbia||Demolished/replaced (1985), formerly vehicle, pedestrian & streetcar traffic||Short documentary "Swingspan" tells the history of the bridge and its demolition.|
|Canso Canal Bridge||Canso Canal, Nova Scotia||Still swings, Vehicle/Rail Traffic||Links Nova Scotia mainland with Cape Breton Island|
|CNR Bridge||Fraser River, British Columbia||Still swings, Rail Traffic||Between Queensborough in New Westminster, British Columbia and the mainland|
|Derwent Way Bridge||Fraser River, British Columbia||Still swings, Vehicle/Rail Traffic||Between Queensborough in New Westminster, British Columbia and Annacis Island in Delta, British Columbia|
|Fredericton Railway Bridge||Fredericton, New Brunswick||No longer swings, pedestrian traffic.||Constructed in 1887 and opened 1889. Last train on the bridge was on 1996.|
|Hog's Back Bridge||Rideau Canal, Ottawa, Ontario||Still swings, Vehicle Traffic||This bridge swings from one end. There is an adjacent fixed bridge over Hog's Back Falls|
|Iron Bridge||Third Welland Canal, Thorold, Ontario||No longer swings, Rail Traffic||Carrying the CNR Grimsby Subdivision over the third Welland Canal.|
|Kaministiquia River Swing Bridge||Kaministiquia River, Thunder Bay, Ontario||No longer swings. Road and rail traffic only. Currently closed due to October 29, 2013 fire ||Built in 1908 by Grand Trunk Railway; currently owned by the CNR|
|Little Current Swing Bridge||North Channel, Little Current, Ontario||Still swings, Vehicle Traffic (formerly rail)||Built by Algoma Eastern Railway, 1913|
|Montrose Swing Bridge||Welland River, Niagara Falls, Ontario||No longer swings, Rail Traffic||Formerly Canada Southern Railway, now CPR|
|Moray Bridge||Middle Arm of the Fraser River, Richmond, British Columbia||Still swings; Eastbound Vehicle Traffic||Connects Sea Island, Richmond, BC (location of Vancouver International Airport) to Lulu Island, Richmond, BC|
|New Westminster Bridge||Fraser River, British Columbia||Still swings, Rail Traffic, formerly had 2nd deck for vehicles||Between New Westminster and Surrey.|
|Pitt River Bridge||Pitt River, British Columbia||No longer swings, Vehicle Traffic||Twin side-by-side bridges connecting Port Coquitlam, British Columbia to Pitt Meadows, British Columbia|
|Pitt River Railway Bridge||Pitt River, British Columbia||Still swings - Rail Traffic||(Please Contribute)|
|Wasauksing (Rose Point) Swing Bridge||South Channel, Georgian Bay, near Parry Sound, Ontario||Still swings, Vehicle Traffic (formerly rail)||Links Wasauksing First Nation (Parry Island) to the mainland at Rose Point|
|Welland Canal, Bridge 15||Welland Recreational Waterway, Welland, Ontario||No longer swings, Rail Traffic||Built by Canada Southern Railway, ca. 1910. Now operated by Trillium Railway|
|Welland Canal, Bridge 20 Approach Span||2nd and 3rd Welland Canal, Port Colborne, Ontario||No longer swings, Abandoned (formerly rail)||Abandoned 1998 when adjacent Vertical lift bridge was dismantled.|
|Bergen Cut-off Bridge||Red River, Winnipeg, Manitoba||Centre span permanently in open position, allowing unrestricted river traffic||Decommissioned CPR railway bridge (last used in 1946)
Superstructure built by Dominion Bridge Co. 1913-1914
There's another one on the channel between Ghent (Belgium) and Terneuzen (The Netherlands) at Sas Van Gent.
Many inner cities have swing bridges, since these require less street space than other types of bridges.
(n.b. "swing bridge" in New Zealand refers to a flexible walking track bridge which "swings" as you walk across)
In the UK, there is a legal definition in current statute as to what is, or is not a 'swing bridge' 
Omaha NE Turn Style Bridge is now a historical landmark. Located 86H674H5+98 Used for rail transport. Connecting Council Bluffs, Iowa to downtown Omaha, Nebraska
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