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Sault Ste. Marie in Algoma District, Ontario — Central Canada (North America)
 

Why Preserve This Big Hunk of Steel?
⎯⎯⎯
Pourquoi préserver cette énorme structure d'acier?

 
 
Why Preserve This Big Hunk of Steel? / Pourquoi préserver cette énorme structure d'acier?> Marker image. Click for full size.
cmh2315fl via Flickr (CC BY-NC 2.0), August 4, 2011
1. Why Preserve This Big Hunk of Steel? / Pourquoi préserver cette énorme structure d'acier?> Marker
Inscription. [English] This steel structure looks like a bridge, but it is actually a dam. It is called the Emergency Swing Dam, since it was designed to swing out over the canal in an emergency and greatly slow the flow of water. Only nine emergency swing dams were constructed worldwide, and today, this is the only one remaining. Of the nine constructed, this is the only one ever put to the test under emergency conditions.

The Emergency Swing Dam is an innovative engineering achievement designed and built by Canadians over 100 years ago, and is commemorated for its successful use during the accident in 1909. Parks Canada protects the dam and the canal to preserve our heritage for this and future generations.

[Francais] Même si elle ressemble à un pont, cette structure d'acier est en réalité un barrage. Il s'agit plus précisément d'un barrage tournant de secours, car il a été conçu pour pivoter en travers du canal en cas d'urgence afin de ralentir le débit d'eau.

Seulement neuf barrages tournants de secours ont été construits dans le monde; celui-ci est le seul à subsister, et le seul à avoir fonctionné en situation d'urgence.

Le
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barrage tournant de secours est une réalisation technique innovatrice conçue et construite par des Canadiens il y a plus d'un siècle. On le commémore parce qu'il a été utilisé avec succès lors d'un accident survenu en 1909. Parcs Canada protège le barrage et le canal afin de préserver notre patrimoine pour les générations d'aujourd'hui et de demain.
 
Topics. This historical marker is listed in these topic lists: Man-Made FeaturesWaterways & Vessels. A significant historical year for this entry is 1909.
 
Location. 46° 30.797′ N, 84° 21.396′ W. Marker is in Sault Ste. Marie, Ontario, in Algoma District. It is on Canal Drive 1.1 kilometers west of Huron Street, on the left when traveling west. Touch for map. Marker is in this post office area: Sault Ste Marie ON P6A 6W4, Canada. Touch for directions.

Regionally, this marker is in the Sault Ste. Marie and Algoma Area and in Northern Ontario. It is also in Central Canada. Globally, it is in North America, in the Great North Woods, on the Great Lakes, on Lake Superior’s North Shore, in the Western Hemisphere, in the Western World, and in the Anglosphere. Historically,
Why Preserve This Big Hunk of Steel? / Pourquoi préserver cette énorme structure d'acier? Marker image. Click for full size.
Fungus Guy via Wikimedia Commons (CC BY-SA 3.0), March 12, 2010
2. Why Preserve This Big Hunk of Steel? / Pourquoi préserver cette énorme structure d'acier? Marker
Featured marker is on the left.
it finds itself in what was once a British colony, the Viceroyalty of New France, the Haudenosaunee (Iroquois) Confederacy, and Rupert’s Land.

Other nearby markers. At least 8 other markers are within walking distance of this marker: The Dam in Action! / Le barrage à l'œuvre! (here, next to this marker); What a Rush! / Urgence! (here, next to this marker); The Last Emergency Swing Dam in the World! / Le dernier barrage tournant de secours au monde! (within shouting distance of this marker); Emergency Swing Bridge Dam / Barrage tournant de secours (about 90 meters away, measured in a direct line); The "Chicora" Incident (about 150 meters away); Canadian Veterans Memorial (about 150 meters away); CPR Passenger Ships in the Lock / Paquebots de la CFCP dans l'écluse (approx. 0.3 kilometers away); 1622 (approx. 0.4 kilometers away). Touch for a list and map of all markers in Sault Ste. Marie.
 
1909 Sault Ste. Marie Dam Accident image. Click for full size.
Don Harrison (reproduced from original) (CC BY-NC-ND 2.0)
3. 1909 Sault Ste. Marie Dam Accident
The Emergency Swing Dam (background) allowed workers to close off the surging water and make repairs.
The Emergency Swing Dam image. Click for full size.
cmh2315fl via Flickr (CC BY-NC 2.0), August 4, 2011
4. The Emergency Swing Dam
 
 
Credits. This page was last revised on May 23, 2022. It was originally submitted on May 23, 2022, by Duane and Tracy Marsteller of Murfreesboro, Tennessee. This page has been viewed 222 times since then and 19 times this year. Photos:   1, 2, 3, 4. submitted on May 23, 2022, by Duane and Tracy Marsteller of Murfreesboro, Tennessee.
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Aug. 26, 2026