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What danger does a low-head dam pose to boaters?

  1. Limited visibility

  2. Strong recirculating currents or backroller

  3. High waves

  4. Risk of lightning strikes

The correct answer is: Strong recirculating currents or backroller

A low-head dam poses a danger to boaters due to the strong recirculating currents, also known as backrollers, that can form at the base of the dam. These currents can trap and submerge boats, making it difficult for boaters to escape and increasing the risk of drowning. Options A and C are incorrect because they do not relate to the specific danger posed by a low-head dam. Option D is incorrect because the risk of lightning strikes is a potential danger for boaters in open water, but not specific to low-head dams.