We ran it on the 15/07/16 with 58 cm.
As mentioned in the guide, I think there is no maximum waterlevel for this part. You should scout at least the rapid just below the first bridge before the put in. The complete section is visible from the road, it is easier to scout before to put in and it allows you to paddle without stopping. This section is very fast, maybe 20minutes if you run it without stopping.
Perfect second run after the Reinbachfalls