They don't venture further north because the conditions just aren't optimal for them. (Well, once in a while they do, but...they're caught and released) There are too many people. Water is shallow etc. Maybe it moves too fast for them etc.
The also like the hydroelectric dammed lakes because...yeah...
They tend to avoid colder dammed areas. I have heard rumors they have been spotted north of cold water dammed areas in the Texas Hill Country. For some reason the water release is quite cold for miles south of the dams.
They do live in the swampy lake and are plentiful in South Texas. They are abundant in a dammed reservoir in South Texas, but I don't think the water released from that lake is very cold.
They prefer warm, slow moving water.
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