There are apps for your smartphone that will help you locate boat ramps on lakes and rivers. Look for them in the App Store.
"Boat Ramps" is free. You can search by name of location, or it will find ramps near your current location and guide you to them.
There is another app called "Texas Boat Ramps" that costs $1.99 and works the same.
You can also go to the TPWD web site and view boat ramp locations and directions to them in the "Where to Fish" area. This is organized by lake and may not show all associated river access points.
Larry D. Hodge