Below Treaty Creek the Bell-Irving is joined by Deltaic Creek from the east, then Wildfire Creek from the west, then Taft Creek from the northeast. Continuing south, the Bell-Irving is flanked on the west by Wildfire Ridge, which separates it from Bowser Lake. Ritchie Creek and Cousins Creek, flowing down from Mount Ritchie, join the Bell-Irving from the east. A few kilometers south the Bell-Irving River is joined by the Bowser River from the west. The Bowser River flows from Summit Lake and through Bowser Lake, and collects water from many large glaciers.
