Directions from Nate Burns:

"On I-30 Pass Chaha Road going out of town (there's a ramp at Chaha but it SUCKS,) and in the middle of the lake take the Dalrock Road exit, take the bridge over the freeway and turn left on the westbound feeder, take the first right to the boat ramp. This ramp is located in one of the very few smooth spots on Lake Ray Hubbard."

Note: this sounds like Point B on the TPWD map.....Dalrock Marina.

Lake map overview from TPWD: