Ignore me, I've completely misunderstood the route - I thought that was a ferry crossing at Ballachulish but on zooming in on the map I see it's a road bridge. (A particularly foolish mistake since I actually rode across that very same bridge on my LEJOG last year and remember it well.
)
In the days of old we'd ride the extra 15 mls or so if the South Ballachulish to North Ballachulish Ferry had closed for the day.i think that the bridge was built in the late 70s or early 80s. You can still see the parking area for the Ferry by the Hotel on the South side!