How They Made This Record-Breaking Bridge | Portage Lake Bridge, Michigan

Building the Portage Lake Bridge required some serious feats of engineering, from floating a structure twice as long as a whale into a tiny gap, to sending workers into a pit full of high-pressure air. Here's the story I wish I knew the first time I saw this bridge.

Thanks to the Michigan Tech Department of Social Sciences and the Keweenaw Time Traveler for supporting this video! Keweenaw Time Traveler comes from the Department of Social Sciences at Michigan Tech, with support from the National Endowment for the Humanities and the Keweenaw National Historical Park Advisory Commission. You can use it to explore the Keweenaw at https://bit.ly/keweenawtimetraveler.

Additional thanks to MDOT for permission to use their historical and drone footage, and for giving me a tour of the bridge, and to Dr. Theresa Ahlborn for reviewing this video's outline for accuracy.

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