Joined: Nov 2011
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6ft 6in - possible, but optimistic. If it were 6ft 3n, you'd have a much better chance.
You would definitely have to be right on Low Water - soon after LW, the level goes up quite quickly. You say 'mid September' - On Mon 14 Sep, LW is 17.15 at Potter, which is right at the end of the day for the Pilot, any later in the week, it's well after office hours, or rather early in the morning.
Have a look at the level for the gauge at Repps Here.
Or search online for 'Repps River Gauge'
Remember that 0.5m = 6ft clearance, so at the moment it is showing LW on 20-Aug 9pm as 0.3m - that's 20cm 'better' than 0.5, so a very tight 6ft 8in clearance - but also look how quickly it goes up, 6cm by 10pm; it may not sound much, but that would crunch the top off a 6ft 6in boat! Also, local knowledge may suggest that it goes up quicker at the bridge than a mile downstream where the gauge is.
You'll also see that the 'trend' is upward at the moment, the river level is 1 or 2cm higher each day than the day before - on the 16th it was 0.22m = 28cm better than 0.5 = 6ft 11in clearance, loads of room!
Check the levels AND the trend before you start your trip, to see if it's worth asking the pilot if you'll get through.
'We demand rigidly defined areas of doubt and uncertainty' (HHGG)