Water oak is one of the most common trees here. In town, it is THE most common. Outside the city, it's common but there are more red oak. My understanding is that water oak is a red oak. We also have lots of willow oak and I have heard it is also in the red oak family. They burn about the same, the wood is very similar, which means pretty good. Most of it is not hard to split at all but knots are another story, as always. Away from knots, it can split like red oak, meaning really nice, uniform splits. The ones in town are now dying, it's really common; I attribute it to the fact they all are 80-120 years old and we have had drought and also super cold and super hot periods, meaning stress. The ones I get calls on are like yours, big. They are a bear to process. I noodle the big rounds into quarters if we can't roll them onto my trailer. Plus, need to noodle them anyway to split them. A 16" round of water oak at 3ft - 4ft diameter is incredibly heavy. A big tree could have 2-4 cords in it. Be careful limbing a huge oak like that, the limbs can kill. Anticipate movement and get out the way! If you are ever undecided about which way a limb (or the trunk) is going, don't cut that.