It would be great if you could attach a few photos to this question. Would that be possible? We are not able to make house calls per se but a majority of answers can be provided by using photographs.

Thank you for the pictures. I do see some leaf problems. The flat black spots visible in your picture Trees 14 are caused by a common fungal disease called maple tar spot. This is mostly a cosmetic problem and would not affect your tree's health significantly.

https://www.canr.msu.edu/news/black_polka_dots_on_maple_tar_spot

The round black and tan spots are called maple bladder galls. Galls are weird growths on the leave caused by the feeding of tiny eriophyid mites on newly developing foliage.Galls come in all shapes and colors and, again, while unattractive do not cause significant health problems.

https://hort.extension.wisc.edu/articles/maple-gall-mites-eriophyidae/

However, by merely looking at your pictures, I do not see any significant problems that would kill these trees--other than possibly age. Do you know how old they are? Also, can you tell me what kine of maple they are? My guess is a Silver Maple, bu the leaves are pretty tattered and I cannot be sure. A picture of a complete leaf or two would be helpful.

Silver maples are fragile trees that need a lot of care. The average silver maple lifespan can be over 130 years, but most only live to 35 years at maximum in an urban setting. The silver maple’s rapid growth is both a blessing and a curse, in that
it can reach its peak of beauty during the lifetime of the person who planted it. Yet, that same growth keeps the branches from becoming dense enough to withstand much force often causing branches and even "sheets" of bark to come crashing to the ground. This can be a dangerous situation if the trees are near any buildings or parking areas.

There is a disease that affects maples that causes death. It is called verticillium wilt. But if your tree were infected with this soil-borne disease, you would have been seeing more than just a thinning of the canopy. You would have been seeing the leaves of entire branches turning brown but yet remaining on the tree. So I doubt this is the problem.

Unfortunately, we do not make house calls to inspect trees. Your best resource for diagnosing and treating your tree is to consult a certified arborist. An arborist is a certified and generally insured expert in trees and their problems. He or she can examine your tree and make recommendations regarding the health of the tree, any needed judicial pruning, and whether or not (in his opinion) it should be removed. You can find a certified arborist in your area here:

http://www.treesaregood.org/

Click on "Find an Arborist" at the top of the page; then click on United States from the pull-down menu. Then enter your State and City. This should bring up a list of certified arborists nearest to you. Or you may be able to locate one under "Tree Services" in your local Yellow Pages.