Condition of cascades??

Just wondering who (if anyone) is responsible for keeping cascades under control. Ive noticed its looking very rough the last few weeks especially around the heath single track loop. I find my bars are a lot wider even though they haven't changed in the last few years :S I understand its single track but there are a lot of sturdy branches poking out.

I would be very happy to assist in a bit of maintenance but just wondering if theres a specific channel i should go through.

Cheers,

Jono.

[Mod. moved to Northern Beaches]