Online Boat Reservations

Hey y’all — hoping someone here knows the answer to this. I’m trying to plan a quick getaway to Lake Granbury and I’d like to rent a boat for a few hours while we’re there. Thing is, I really don’t want to deal with calling around or showing up and hoping something’s available. I’d much rather book online ahead of time and not stress it. Anyone know a marina around Granbury that lets you reserve boats online easily?