You need professional help. Check the link below to a site where you can locate an arborist in your area. Good luck!

Here is a link that might be useful: WAA Search

This is not a new thing, although it may be in your area. It is variously called "maple decline", or "maple blight", and a few other things, and has been documented and studied for decades.

It doesn't seem to have any single cause. Seems to be a highly variable combination of weather patterns, bugs, molds, soil problems, and any other stresses that could affect a tree. Just an interacting jigsaw puzzle of things that, in most years, are minor irritations. Some years, they just plain gang up on the trees.

Some recover fully, with no apparent ill effects. Some die. Some lose a limb or three. Come spring, cut out dead limbs, fertilize gently, and water when they might need it.

Contact your local county extension agent for info on what has been happening in your area. And don't panic. Many may make it through. It just may have been a really bad concatenation of weather and pests working together this year.