ناوبری در رودخانه «سنت لارنس» — اعم از حرکت در جهت بالادست یا پاییندست، و از مبدأ یا به مقصد دریا — برای مقاصد تجاری، همواره برای شهروندان ایالات متحده آزاد و باز خواهد بود؛ مشروط بر رعایت قوانین و مقررات بریتانیای کبیر یا «دامینین کانادا» که با این امتیازِ ناوبریِ آزاد مغایرت نداشته باشند.
The navigation of the river St. Lawrence, ascending and descending, from the forty-fifth parallel of north latitude, where it ceases to form the boundary between the two countries, from, to, and into the sea, shall forever remain free and open for the purposes of commerce to the citizens of the United States, subject to any laws and regulations of Great Britain, or of the Dominion of Canada, not inconsistent with such privilege of free navigation. The navigation of the rivers Yukon, Porcupine, and Stikine, ascending and descending, from, to, and into the sea, shall forever remain free and open for the purposes of commerce to the subjects of her Britannic Majesty and to the citizens of the United States, subject to any laws and regulations of either country within its own territory, not inconsistent with such privilege of free navigation. Article XXVII.