Interesting. the 1811 quake might have created the Caddo Lake.
Caddo lake is Texas largest natural lake
Took this from the Texas A&M University web site;
According to a Caddoan legend, Caddo Lake was formed by an earthquake. A Caddo Indian Chief was warned by the Great Spirit to move his village from the low lands. The Chief ignored the warning and one day while he and his men were out hunting the ground shook. When they returned, their village was gone beneath the water of the newly formed Caddo Lake.
There could be some truth to this story. In 1811 New Madrid, Missouri had an earthquake that measured 8.9. This could have knocked down enough trees to form the great raft that dammed the Red River and formed Caddo Lake.