What is a prominent feature on the approaches to Rochester Harbor?

The prominent feature on the approaches to Rochester Harbor that stands out is indeed the stacks at the wastewater treatment plant and the tall apartment building. These structures are easily identifiable to those navigating toward the harbor, serving as visual landmarks for boaters and pilots. The stacks are significant because they represent a critical infrastructure component and are also quite tall, making them more noticeable from a distance. The tall apartment building adds to the skyline and further aids in navigation.

Other options may not provide the same level of visual prominence or relevance to those approaching Rochester Harbor. For instance, while cooling towers and federal buildings have specific utility and importance, they are not as immediately visible or associated with maritime navigation as the stacks and the apartment building are. The large yellow water tank could be visible but does not have the same recognized significance in the context of marine navigation when compared to the stacks and the tall building. Thus, the combination of these two features offers a clearer and more recognizable reference point for approaching Rochester Harbor.