Only lake in Texas that's not man made?

The largest designated natural lake touching the border of Texas is Sabine Lake, into which the Sabine and Neches rivers discharge. It is more ... Man did not purposefully cause that lake, but maybe offhandedly because the logging operations made the trees available that dammed the river, causing the lake to form. read more

Lake Texoma in a man-made lake. In fact, the only natural lake in Texas is Lake Caddo. read more

In fact, the state had only one natural lake, Caddo Lake in East Texas, that was formed by a log jam. A permanent dam was installed at the lake in the early 20th century. A large number of the state’s remaining lakes were made in response to the occasional propensity of Texas’ usually tranquil rivers to flood during heavy rains. read more