Hey Bastien...
Last year at Hell or High Water 3 (May 7 2011), the level was 'high', at 3.6 m on the gauge (200 m3/s). It is now around 3.0 m on the gauge (just below 100 m3/s--half the flow). So I would call it a 'medium' level for the town section. Still lots of fun! I just hope it is still good for this year's Hell or High Water IV, May 5, but at the rate the level is dropping, it better rain... If you want to do the upper section (Algonquin park), it's interesting at any level. Have fun!
--C.