Murry is the closest "non [censored] shoot" for smallies from the DFW area. Devils or Pecos Rivers are are best smallmouth fisheries in Texas...period! Go figure: way north or way south! Belton is the best reservoir in Texas to possibly "expect" smallies within the state, IMHO. Good luck!
Just spent a week paddling the Pecos and did not catch one small mouth. I was surprised, I caught a ton on the Devils last time I was there but none on the Pecos. We caught quite a few nice large mouth.
Around here I would go to Texoma and fish jerk baits, crank baits, and top waters close to the bluff walls if you want a good chance at catching smallies.