As the canal marked the up - river limit of Orleans Parish , it became known as the Upperline Canal .
The city of New Orleans annexed Carrollton , and the canal became the boundary line between Orleans Parish and Jefferson Parish .
As the canal marked the up - river limit of Orleans Parish   , it became known as the Upperline Canal .
The city of New Orleans annexed Carrollton , and the canal became the boundary line between Orleans Parish and Jefferson Parish .