Below is a clipping from Keowee Courier, Feb. 19, 1880 that started me on the journey of discovering more about this flooding. My question was, why was it Flooding in Feb.? Here's the article:
On further research I answered my question with this information: "the warm Chinook Wind from the north" would come during the winter months and melt the heavy snowfall in the mountains and also cause heavy rains.
The loss of business makes for interesting writing material. I also found a business who built above the highest flood water for their building to avoid the nearly constant river floods.