Christer and the floods from the past

Christer is standing next to the markings of where water has stood in the past. Some of the markings date waaay back, hopefully you can see some of the old dates in the picture. The river is about 100 feet from where Christer is standing, so for the water to have risen as high as some of the markings reveal would have been one horrific flood! Christer is 5 ft. 10 inches....