What hazard is located just west of the ferry landing at the Adolphus Reach?

The correct answer identifies submerged power lines as a significant hazard located just west of the ferry landing at Adolphus Reach. Submerged power lines pose a critical danger to boats and watercraft because they are often difficult to detect and can result in serious accidents if encountered. Operators must be especially cautious when navigating in that area, as striking these lines could cause electrical damage to vessels or, worse, expose individuals to electrical hazards.

The other potential hazards, such as sunken vessels, shallow sandbars, and weak currents, may present risks in some navigation situations. However, the specific phrasing of the question indicates that submerged power lines are the immediate concern for that precise location. These power lines are typically marked on navigational charts, but depending on the timing and visibility, they can be easily missed without proper attention, making safety awareness crucial for any vessel operator in that vicinity.