Did that hike a number of times back in the 80's... The trail is tough to find in locations, but as long as one is following the River Upstream, one will come to TBTN... We use to get to trailhead at 5 Am and actually start hiking in the Dark (but when you are in Your 20's you are crazy that way...
)
Probably wouldn't hike in the Dark nowadays... but at least you'd be done and hiking Downstream in the light of day....
That Bridge Never seems to change....