Ingrid and I stopped by this Geocache today. The Power Of Water (Virtual Cache) It’s a small memorial next to the Big Thompson Canyon Fire Dept. In 1976, a flash flood in the area claimed 144 lives when the volume of the river increased from it’s normal 200 cfs to 31,000 cfs in just 4 hours. People traveling the canyon were caught in their cars. The memorial lists the names of all 144 victims.