Possibly named after the Plimsoll Line which marks the safe loading limit on the hulls of ships. The Hawkesbury River had dozens of trading vessels plying the route from Windsor and Colo to Sydney during the 19th and first half of the 20th centuries. These boats were important to the economic prosperity of the region as well as providing an effective communication channel between settlers along the Colo, Macdonald and Hawkesbury Rivers. Two steamships, the Kallawatta and the Erringhi are commemorated in the naming of streets in McGraths Hill.
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