First off, do not post any more facts about your case, we never know who is watching what we say online. Secondly, people can be arrested based on the word of another, this unfortunately happens all the time. My advice to you is this: Do NOT speak to the police. If the police contact you or arrest you, simply state that you will not speak without a lawyer present. Do not try to explain the situation or say what your side is, just say you won't speak without a lawyer. You need to speak with an attorney immediately to protect yourself from any potential charges. If you cannot afford one, contact the Oregon State Bar's Modest Means program at 503-684-3763, and they will refer you to a lawyer.
I agree with Attorney Turnoy. You need to consult with an attorney now. First, it would be helpful to have an attorney ready for you should you be arrested or charged. You would hate to have something happen late on a Friday, where you are trying to find an attorney over the weekend and spend more time in custody. An attorney can also advise you of how best to navigate this before you are charged.
additionally, if you are dealing with easements and conditions, these are tricky issues and how you act now can be permanent. You need to consult with an attorney on this issue and how best to deal with this , hopefully in a way that avoids litigation, but will help you make the right steps.
To be blunt, purely with respect to the criminal law question you pose, yes, you could be arrested for criminal mischief on the report of this neighbor. I am not saying that you will be because there is not enough information for that. Whether the neighbor claims to have personally witnessed the conduct or not is important, for example. Also, the fact that you could be arrested does not mean that a prosecutor will feel that there is sufficient evidence to issues a charging instrument. In any event, my usual feeling is that a suspect rarely is wise to speak with the police. We all have the constitutional right to remain silent as well as a right to legal counsel. All suspects should be encouraged to exercise those rights. Thus, you should speak to an experienced criminal defense attorney who, if retained, can contact the officer and invoke your rights and deal with any charges if, ultimately, any are filed.