How was the Royal Navy able to have gunships in Lake Erie during the War of 1812?

The Royal Navy had major shipbuilding ports on Lake Ontario, but there seems to be no way to get them to Lake Erie without a major portaging effort around the Niagara Falls. I see no references to a British shipbuilding port on Lake Erie. I'm stumped.

?2011-10-17T19:24:17Z

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ALIENS

?2011-10-17T19:56:39Z

Lady Barstow is correct. You must realize these were not the great, seagoing ships of the line that were encountered at sea and in New York and Baltimore harbors. They had warships on the St. Lawrence Seaway too, but again, these were of a size suited for the more restricted waters of the area.

?2011-10-17T19:34:56Z

With the fall of Detroit, and the capture of Fort Mackinac the British had three small merchant ships converted to warships plus a small U.S. brig, Adam, captured with the fall of Detroit.