On Sunday, June 7, 2020 at 6:42:22 PM UTC-4, Clare Snyder wrote:
On Sun, 7 Jun 2020 14:49:42 -0700 (PDT), Sonny
wrote:

On Sunday, June 7, 2020 at 2:19:37 PM UTC-5, DerbyDad03 wrote:

Do I need to go back to the collar or can I leave the 8' - 10' that still
has leaves?

If I can leave it, where is the best place to make the final cut? Perhaps
just beyond the final group of leaves?

Cut only the dead wood off. My experience with red maple is that they often have spotted, random die-off as that.

However, if that limb, more so than other limbs, has a history of having parts dying off, then it might be best to cut off that whole limb. With the tree being that old, if that limb has repeated die-offs, then it may be a venue for disease, bugs, etc. to the rest of an aged tree. Seems the tree is pretty healthy, otherwise.

Sonny
I'd take it back to the next LIVE LATERAL BRANCH if attempting to
salvage the limb. If there is bark damage showing down from the dead
section I would go back to the next lateral beyond the damage.. That
said, branches parallel to the ground or "down-running" are good
candidates for total removal as they are generally more prone to ice
and wind damage than branches that grow "up".

There is no live lateral branch. The growth you see is on the main limb
itself and ends before the pruning pole. The lateral branches are beyond
the pole and they have no leaves.

While the limb looks looks parallel to the ground, it actually slopes
upward. There are other limbs that are much flatter than the one in
question, all of which have survived lots of wind and a couple of major
ice storms.