Done it yesterday and the track conditions were fine. Pretty wild at the top though with very poor viz. Went along the east side of Glen Feshie so can’t comment on the bridge situation.
I’d get up quick they’ve started surfacing/armouring the track just before the rocky section ends (or starts depending which way you’re going) they’ve already done a few hundred metres worth and according to a conversation with a guide leading a group of kids on the hill they’re going to be continuing it right to the top. So next time you do it, it could well be a smooth(ish) armoured surface and drainage ditches.
Hopefully not as it was the first time I’d done it and can’t wait to get back.