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Home > Travelogues > Karri Trees - Giants of the forest
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Karri trees (Eucalyptus diversicolor)

Karri trees are found only in the south west of Western Australia, where these magnificent giants occur mainly in the Karri belt which stretches from Nannup and Manjimup in the north west, down to Walpole and Denmark in the south east, incorporating Pemberton, and Northcliffe, with isolated pockets found in the southern corner of the state outside of the main Karri forest belt.  Karri trees are very specific to the soil and depth of soil they can survive in, so these isolated pockets are in a clearly defined line of where they occur and where they don’t. 
 
One of the tallest tree species in the world, Karri trees have an estimated average lifespan of around 300 years.  Typically, they have a smooth tall trunk with branches only in the upper section. 
 

 

Taller trees in key locations were once used as fire lookouts, with someone climbing up on pegs placed spiralling around the trunk daily during summer, to a small cabin at the top which contained at first a telephone and later radio communication equipment.
 
Three well known trees are the Gloucester Tree at Pemberton, the Dave Evans Bicentennial Tree south west of Pemberton, and the Diamond Tree between Pemberton and Manjimup.  All three trees have been open for the public to climb up the steel pegs, but the Diamond tree has now been closed to climbers due to concerns about the soundness of this tree. You can still see this tree from the picnic area at the site. 
 
 

The Boorara Tree, a former fire lookout near Northcliffe, was pegged in 1952.  It is 71 metres tall, and one of very few old growth forest trees remaining in the location.  This was never open to the public for climbing.  When no longer used for fire watch, and due to the tree being considered unsound, the upper section of the trees with the hut was removed, and the lower pegs were removed to prevent access. 

 

A larger sized wheel chair accessible model of the original hut is on display at the site to show visitors what these tree top cabins looked like. 

 

 

Climbing the Diamond Tree above and at left. 
 
"Keep on climbing and don't look down, you are nearly at the landing." 
 
Please note that the Diamond Tree has been closed to climbing due to stability concerns.  These photos taken prior the closure and removal of lower pegs.    
 

These trees now have a line of lighter pegs running parallel to the climbing rungs, with wire netting between the two lines being a more recent addition. 

 

 

Fresh bark, after outer bark has peeled, can range from white to tan or even orange seasonally.

Karri Trees at Denmark showing this seasonal coloration (
above and at right). 
 
The scarred trunk of an older Karri Tree in the Porongurup Range, a pocket of Karri Trees, separate from the main Karri belt (below).

The Diamond Tree, at 51 metres is not so tall, but an extended timber hut at the top still towered over the neighbouring trees. This tall timber hut at the top has not been replaced and is still intact.  With the fire surveillance network being abandoned in the 1970s, the Diamond Tree was used again for this purpose in 1994.  After 75 years of being climbed by fire watch personnel and the adventurous public, this tree was considered unsound, so for public safety was closed to climbing in 2019 and the lower pegs removed. 

 

Once the ladder was created by hammering in wooden pegs, but these were later replaced with metal pegs. Scars up the Diamond Tree show an earlier peg line.

 

# The Gloucester Tree, as the most popular tree for climbing, now has a small metal viewing platform relacing the hut where the fire watch officer used to sit.  This hut had very limited room for visitors, so only a few could climb at a time, and common sense meant waiting for the group to return before the next group went up the tree. Having made the climb a number of times during the 1960s, I found the most frightening thing was lowering myself out of the hatch to find a foothold on the first available peg.  I recall a single row of pegs, which were spaced a little too far apart for my size.  The Gloucester Tree is 58 metres tall.  The present viewing platform, at 53 metres, is limited to nine persons at a time.
Climbing the Gloucester Tree at Pemberton to dizzy heights.  One big step after another, all 153 of them
 

# Dave Evans Bicentennial Tree has a similar viewing platform, as well as having platforms part way up the tree.  This 65 metre tree was pegged in 1988 as a climb, having not been used earlier as a fire lookout. It has however been used as a fire lookout on occasions when the planes could not fly.   

The area was logged in the 1950s and the present Karri trees seen here are relatively young trees.  A remaining stump shows the size of the trees that were logged. 

 

Young Karri Trees line the roadside between Manjimup and Walpole. 

To experience more of the Karri trees of this area, there is a good campground in the Shannon National Park.  This campsite has been rebuilt following being burnt out in a devastating bushfire during January and February 2015.   

There is a 2.5 kilometres downhill walk from the parking area at the Boorara Tree to Lane Poole Falls, a small seasonal waterfall on the Canterbury River.  

The was once a network of nine trees once used as fire lookouts but one was burnt down early, leaving eight which were used until 1973, but none of these are the tallest Karri tree. These were supplemented by ten lookout towers built on hills, giving a total of eighteen fire lookouts. 

See the tallest Karri Tree on the next page 
References:
Please see next page 
341_scenic_sw_hwy_dsc09481.jpg
TravASMTC2005 Karri trees pg 27
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From the mid 1890s Karri paving blocks for use in the streets of England's major cities were the main timber product exported. At the turn of the century 50% of Western Australia's timber exports went to Great Britain as pavers. Trees thought to be up to 90 metres tall were logged. 

                                   

Karri and Jarrah were also exported to places like South Africa where, as in Australia, they were used in mines, for railway sleepers, and for the construction of jetties and bridges. In the early part of the twentieth century 95% of local timber was sold to England, eastern Australia, India, South Africa and New Zealand.

 

Karri timber has been used extensively in the building industry, particularly in roofs for the length and knot-free quality of the boards. The wood is also ideal for flooring, furniture, cabinetry and plywood.

                                                                       

Woodchips were first exported from the region in the 1970s to supply paper pulp manufacturers, mainly in Japan.  Both Karri and Jarrah trees in old growth forests were felled for export woodchips. Since 1976, when wood chipping began in Western Australia, approximately fifteen million tonnes of native hardwood woodchips have been exported to Japan.

 

True old growth Karri forest became a small percentage of the existing Karri forests. 

 

Now much of the woodchip exported comes from softwood plantation timber. 

# The Gloucester Tree was temporarily closed to climbing in July 2023 while undergoing maintenance and remains closed with no anticipated date given for opening.

The Dave Evans Bicentennial Tree was also closed to climbing at that time, and also remains temporarily closed with no opening date given. 

A new adventure has been commenced by Aerial Adventure Pemberton, with a Ropes and Flying Fox course in the Gloucester National Park.   
 
January 2024.  See further update below ##
## The Gloucester Tree and The Dave Evans Bicentennial Tree have been given a glimmer of hope, with the Western Australia state government committing $3 million to the upgrades.  The time frame for completion is expected to be in excess of twelve months. 

2nd May 2024