there are 3 sections on the hellyer, upper, middle and lower (hellyer/arthur)
the upper section from burnie link rd to old highway (hellyer gorge picnic area) was attempted once by the club but a walkout resulted. it is 15k long and was described as g3. We found it narrow, loggy tricky g3/4, and very slow going (scouting rapids that continue around corners chewed up the time) so we walked out at a logging coup, then banana got stuck.
middle section from gorge picnic ground to blackwell bridge is rocky, so needs to be in minor flood and is g2/3.
from blackwell to farquars br. is mostly 2/3 but with two 3+ cascades at the end (low water), when high the first cascade washes out and the second becomes a bigger g4 called the mouth! This last section (the hellyer/arthur section) has a big car shuffle, and you could go from the gorge picnic ground all the way to farquars if the water was v. high.