Tatum Cove is Pace Bend Park's east-side boat ramp, reached by turning onto Grisham Trail inside the park. It's a one-lane concrete ramp run by Travis County Parks, open from 8 am until civil twilight. Drinking water is available across from the ramp.
LCRA lists this ramp as usable down to a lake level of 653 ft. Ramps open and close as the lake rises and falls, so check LCRA's boat ramp status page before you head out.
Park entry is $5 per person ($3 for seniors 62 and older, free for kids 12 and under), plus $7 per trailer per day. The entrance booth takes cash only.