St. Patrick's Day is here yet again, and Chicago is going to celebrate the only way it knows how (other than packing its bars to the gills): by dyeing its river green for all the world to see. Sure it looks like a health emergency, but it's definitely festive, and, honestly, St. Patrick's Day is kind of a health emergency.
However you feel about the more, ahem, indulgent side of the holiday, we'll bet you still get a little thrill out of seeing a green river. Generally carried out the Saturday before St. Patrick's Day, it's a tradition that's now over a half a century old, and it's arguably the most famous celebration of its kind in the country.
Here's how they pull it off: