"Do you have an ethical obligation to keep the local community informed with accurate, up-to-date information? Why or why not? In a 250-300 word post on your class blog, explain your position on this question. "
In the situation described, I certainly think you have an ethical responsibility to the local community. Despite your company not selling a product locally, it is still a part of the community. It will almost certainly have people in the community who work at the company. In addition, in the United States, corporations are expected to help uplift the communities they are in (whether this happens in practice as much is debatable). It would, at a minimum, be in corporate's best interest to let you allocate some time to keeping the affected community appraised of the construction effects on the area. Your communications to the people who live in the area will certainly not go unnoticed.
Your corporation could stand to be negatively affected should you choose to not keep the community informed in a responsible manner. If your company is capable of causing enough displeasure in the area, there is a good chance you will hear about it from the local government. Since the people are the government in the USA, staying in their good graces is probably going to keep you in the local government's good graces. The local government has the power to make decisions that directly affect your company. Zoning laws, tax reliefs, and other ancillary benefits are all good reasons to be good to the folks around you.
I think the ethics of clear and timely communications, despite the extra effort involved, would be a net positive to all the parties involved in this situation. It's also just good to always strive to make the world a better place. If that's what you can do about a situation, that's the best path forward.