In case you might be interested, there is a control line circle at the Greater Southwest club in Fort Worth. It is an RC club but we have one grass circle on site. The site is on Randol Mill Rd. about a quarter mile or so east of East Loop 820.
Also, several guys with the Fort Worth Thunderbirds, at Benbrook Lake, have been kicking around the idea of getting a control line circle at their site. Late last year I heard the circle was to be completed this spring. I have no update at this time.