That is bad news about Erling and I wish you guys well in your efforts to destroy the salvania grass. I have made several winter-time trips to Caddo in the last fifteen years. It is one of the few natural lakes in the state of Texas. It is also my understanding that the lake was formed, similar to Reelfoot lake in Tennessee, when a major river system backfilled a low lying area during a major earthquake. My son and I were down there four weeks ago and the Salvania wasn't nearly as bad as it has been in the past.