In reply to C Rettiw:
The Esk area has been subjected to heavy use in recent years, but much of the 'damage' isn't by organised groups, it is from the fly-camping community with their bbq's and beer cans. Abandoned tents fully loaded with trashed kit and all the litter blowing about the hillside and into the water. One could argue that organised groups have helped popularise this gorgeous place, but I think that's only a weak argument and social media has much more to answer for.
I use the Esk gorge as a work venue and have done for around 10 years. Yes there are times when we need to venture onto the sides of the river, but I honestly try to keep this to an absolute minimum as I realise the verges are sensitive and easily damaged. It is often possible and always our aim to be in the water pretty much the whole time. When jumping in to the pools this is done from rocky areas on the bank and not soft verges. So overall our interaction with the vegetation is minimal.
I wasn't aware of any bolts in the Esk. In Lingcove which is a tributary, then yes there are numerous bolts for a canyon descent. But in the Esk they are simply not needed so would be a waste of time and money, not to mention potentially unsightly.