All the trees in my yard and the ones on either side were planted in 1925 when it was one large lot. A mix of maples and oaks. The maples are apparently near the end of their lives as numerous ones have died. They all die the same way. The large limbs die off one at a time then finally the whole tree after several years. Eventually the limbs drop but it takes a long time before the man trunk topples.
The largest tree is right in front of my house. It is about 110 feet high and is bifurcated. All the maples are bifurcated. If one of the main trunks fell it could take out my house or the neighbors so I have an interest in keeping it healthy and it seems just fine. It is an open, airy tree and that helps.
Is there any benefit to watering the base during dry spells? The main clump of roots is about 8 feet across and sometimes I water it but I wonder if watering the surface does any good? I’ve seen systems designed for watering trees that use a hollow spike driven into the ground to get the water deeper.