This is an archaic French unit of measure which did not have a fixed equivalent in English measures. A toise varied between 6.0 and 6.5 ft. Modern sources fix a toise at 6.396 ft. Nelson (1961:24) suggests that for the 1803 map, a toise equaled 6.0 ft.

A toise (symbol: T) is a unit of measure for both length and area originating in pre-revolutionary France. As a unit in North America, it primarily relates to colonial French establishments in early Louisiana and Quebec.