08/01/2026
Fifty years ago today, Colorado experienced one of the deadliest natural disasters in our state’s history.
On the evening of July 31, 1976, a nearly stationary thunderstorm parked over the Big Thompson Canyon and dumped as much as 7.5 inches of rain in about an hour, with up to a foot of rain falling in just a few hours. The Big Thompson River transformed from a peaceful mountain stream into a devastating wall of water that roared through the canyon with little warning. (USGS)
By the end of the night:
144 people had lost their lives.
More than 250 were injured.
Hundreds of homes, businesses, bridges, and miles of roadway were destroyed. (USGS)
For many of us who forecast weather in Colorado, the Big Thompson Flood isn’t just history. It’s a reminder of why we take Flash Flood Watches and Warnings so seriously.
Mountain canyons are beautiful, but they’re also unforgiving. Rain doesn’t have to be falling where you’re standing for floodwaters to reach you. A thunderstorm miles upstream can send a wall of water racing downstream with astonishing speed.
So today we remember the victims, honor the survivors, thank the first responders who risked everything, and recognize the lessons that tragedy taught us.
If you’re recreating in Colorado’s mountains
🌩️ Keep an eye on the sky.
📱 Have a way to receive weather alerts.
🏕️ Never camp in a dry creek bed or too close to a river.
🚗 If a Flash Flood Warning is issued for your area, move to higher ground immediately. Don’t wait to see the water.
May we never forget the lives lost, and may we continue to learn from one of Colorado’s darkest days. ❤️
Image courtesy of the Loveland Reporter Herald