William H. Latham is a 77-ton icebreaker owned and operated by the New York Power Authority on the Niagara River.

[4] The ship's mission is to keep the Power Authority's inlet ports clear of ice.

Occasionally, she is used to break open the Buffalo river or the Lake Erie ice boom for emergency repairs.

During emergencies two crews work alternating twelve-hour shifts to keep the vessel functioning twenty-four hours a day.

Ontario Hydro operates a similar vessel, Niagara Queen, to clear the inlet ports for hydroelectric power generators on the Canadian side.