Why HMS St Lawrence could not remain on the Great Lakes

Could HMS St Lawrence have remained on the Great Lakes after the War of 1812?

Probably not; the postwar treaty settlement would have required her removal from service on the lakes.

HMS St Lawrence could physically have survived the War of 1812, but continued military service on the Great Lakes faced a different constraint. The postwar treaty settlement limited naval forces on the lakes. Those restrictions would probably have required the ship's removal from service there. Preserving the hull would therefore have been insufficient to preserve its wartime role.