We did as far as we could go along the Bush arm. The Waterfalls are at Icefall.
The river "crossing" is on the way up to Amiskwi, but before you turn off the road to the south, so it may be on the way to David Thompson. I think 'freak did get to the trailhead...I don't have the maps in front of me, but will look tonight.
Is this the trail head?