Yes it is dodgy alone,especially where you can't see the bottom. As said above walk it first to see how deep it is. Push across the bridge if it is too deep
I was there about 6 weeks ago with Brownie and Bob, and we decided to back track and go around. There is a really washed out deep bit, or there are the stones - neither look appealing. The bridge is not very bike friendly either....
Road it yesterday as TEC with a visiting TRF Group. Farmer Giles has filled it in and it was therefore a bit of an anti-climax having wound the guys up about having to cross on a slippery 2" wide rock ledge - it is the easiest I have ever found it!