Forgot to add, This is the statement from QLD NP's, pretty perculiar statemnt from them.
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Just because you cairn, doesn’t mean you should!

Our parks and forests are wild areas that need to stay wild.
Rock cairns have been used historically as navigational aids when there is no obvious track to follow—when used for this purpose the use is well respected.
Rock stacks which are purely for somebody’s pleasure, are becoming a problem in many parks.
We recently came across many rock stacks in one area of Cania Gorge National Park.
Look beyond what may be visually pleasing to some,

notice how the dry creek bed is now bare of its rock cover! All these stacked rocks should be on the ground serving their purpose.
Next time you think about stacking stones, consider:

if you do one, it may encourage others to make them also

you may like the look of it, but the next person might find it intrusive and unsightly

stones in creek beds help soil absorb water by preventing runoff

stones and rocks help to stop erosion along creeks and walking tracks

scattered rocks provide critical habitat and refuge for many plants and animals.
Rock stacks are vandalism—disturbing the natural environment that parks are there to protect. QPWS Rangers can issue a penalty infringement notice (PIN) to anyone constructing an unauthorised structure or works in parks, with fines of $689!
So, remember, leave only footprints when visiting our parks and forests!

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