In reply to Belle74:
Barring very heavy rain the day before (not currently forecast), or worse, lots of snow melt (the snow isn't there to melt), I can't see it being a problem.
The only river crossing that doesn't have a bridge is the outflow from Steall Falls, and unless it's genuinely massively in spate, the worst you'll get there is wet feet.
And if you park at the waterslide car park at the end of the road, then walk down the road to Achriabhach and up Sgurr a Mhaim then round that way, any wet feet will happen near the end of your day anyway.