When yo cross Wilmer Bridge you will see the purple gate on the left.
That is the entrance to the range
https://www.google.com/maps/dir/Salado,+TX/Wilmer+Bridge,+TX/@31.7769403,-98.1811658,8z/data=!3m1!4b1!4m13!4m12!1m5!1m1!1s0x8645390981c317c9:0x8cd9a294650fadbe!2m2!1d-97.5386204!2d30.9471278!1m5!1m1!1s0x864eb9760c571925:0xc2bfc1350301edd5!2m2!1d-96.622215!2d32.617634
Da Gate
https://www.google.com/maps/@32.61527,-96.6254085,3a,75y,180h,89.46t/data=!3m4!1e1!3m2!1seApVDep18A6fXrB5psa_Qw!2e0!6m1!1e1