You may wish to refer to:
http://www.history-sites.com/cgi-bin/bbs62x/itcwmb/webbbs_config.pl?md=read;id=7883
and see item 4. Eastern Beale Wagon Road map.
The Beale Wagon Road running west of Rock Mary basically followed the watershed line between the Washita River on the south and the (South) Canadian to the north all the way west to the Texas Panhandle.