It can be paddled at almost any level.
Depending on the groups abillity, should Serpents Tail be run, it starts to get “sticky” around 5 on the gauge at Mile End Mill.
How do we know what the gauge is before we go ?
Look at the EA gauge for Corwen :
0.46 on the Corwen gauge is 2 on the gauge at Mile End Mill.
0.52 is 3 at MEM
0.58 is 4 at MEM
0.64 is 5 at MEM
0.70 is 6 at MEM
0.76 is 7 at MEM
0.82 is 8 at MEM so on and so on