I own a "slice" of property in Michigan which was purchased very recently along with a much larger portion of land not adjacent to a lake. The piece of land in question is only 20 ft wide at a public road stretching to 45 ft at the water's edge.
The property has "deeded" access to four other properties to allow in and out privileges(ingress and egress only).
The other four properties think they "own" the land and do not realize that the "owner" has different rights than they do (such as the owner can leave chairs on the property and also erect a dock as long as access is not impeeded)
Two of the "deeded" lots have been sharing maintenance of the land (for a number of years that may exceed 15) because they thought they owned the property.
Should I worry about squatters's rights in this case? I have already contracted a firm to maintain the lot immediately upon purchase of all the properites and I have also notified the previous "maintainers" that they do not need to mow the lawn anymore and their rights as "deeded accessers" will of course be maintained and unimpeeded.

I should also mention that there are no buildings or permanent structures on the land since the "slice" of land is too small to allow this due to zoning and building restrictions.

I can understand this is a frustrating situation for you. I do suggest you contact an attorney to determine your legal options for dealing with the adjacent homeowners. "Adverse possession" is the legal term generally associated with "squatter's rights." Whether or not the adjacent owners have obtained any kind of right to dictate use of the property beyond what has been recorded may depend on a variety of factors. This can often be a complex area of law and an attorney typically needs to review a variety of factual circumstances involved, in addition to the law in your area. Failure to protect or enforce your rights, once you understand their scope, often has negative consequences. You can find an attorney through the search feature on the right side of this page. Good luck!