The Great Lakes Isn't Really a Lake It's a Wound

There's a single chamber of concrete in northern Michigan that a very large share of American steelmaking runs through, and there is no practical alternative route. There's a fleet of thousand-foot freighters that can never leave the water they were built on. And there's a waterfall that gets quietly turned down at night so the turbines can have more of it. Those aren't the strangest facts on this list. 15 facts about what's under the Great Lakes — from lake floors sitting hundreds of feet below sea level to the thing every map of this region has been hiding for a billion years. ⏱️ CHAPTERS 0:00 Three things that shouldn't be true 0:48 15. A fifth of the world's fresh water 2:20 14. The water that doesn't refill 3:33 13. The legal wall around it 5:04 12. The hole Chicago cut in the divide 6:21 11. The one chamber 7:47 10. The fleet that can't leave 9:10 9. The freight nobody sees 10:28 8. The waterfall on a dimmer switch 11:34 7. The lakes make their own weather 12:35 6. The filter nobody wanted 13:45 5. The cold that preserves everything 14:48 4. The six-foot swing 15:59 3. The basins are tilting 16:50 2. The floors below sea level 18:03 1. The continental wound 19:51 What it actually is 📍 COVERED The Great Lakes Compact • the Chicago Sanitary and Ship Canal • the Poe Lock • the Welland Canal & St. Lawrence Seaway • Niagara and the Adams Station • lake effect snow & the Michigan fruit belt • zebra and quagga mussels • the Edmund Fitzgerald • glacial isostatic rebound • the Midcontinent Rift 🔎 THE ONE THAT SHOULD WORRY PEOPLE Less than one percent of Great Lakes water is renewed each year. Everything else is inheritance from ice sheets that are not coming back. Superior's retention time runs about 190 years. That means this isn't a renewable flow like a river — it's a stock. Anything taken out isn't replaced at anything like the same rate, and anything put in stays for a very long time. 👇 Which one did you not know? 🔔 Subscribe for more. #GreatLakes #LakeSu