Isthmus

Ancestral mountain.
Maungawhau Tihi.

Approach

The volcanic scoria cone of Maungawhau  / Mount Eden is waahi tapu—a sacred place of immense historical, cultural and spiritual significance to the Mana Whenua iwi/hapū of Tāmaki Makaurau. Inhabited since 1200AD the iconic pā site (defensive settlement) needed to accommodate the growing pressures of tourism whilst repairing eroded tracks, geological features and restoring the culture and mana of the maunga. The sensitive design response treads lightly on the land, elevating visitors on a structure that floats above the maunga itself and restoring the mauri and wairua of this special site.

Images (clockwise)
Plan combining lower and upper tihi sections of the boardwalk;
Route materiality Stage 1 and Stage 2; Extent of works Stage 1.

In 2018 the Tūpuna Maunga Authority (TMA), a co-governance statutory authority between Ngā Mana Whenua o Tāmaki Makaurau and Auckland Council, commissioned Stellar and Isthmus to deliver a world-class boardwalk experience on the ancestral volcanic crater of Maungawhau. Stage One which stretches around the crater from the lower tihi (summit) to the upper tihi is the first piece of this work to be completed.

Right

The new boardwalk allows visitors to move across the ancient tūāpapa (terraces) and rua (pits) without causing damage.

As part of the extensive planning for the project the project team reviewed precedents from other World Heritage sites that had dealt with similar challenges. We then worked with the Tūpuna Maunga Authority and other specialists to develop an innovative steel-framed boardwalk system with a minimal, removable footprint that would protect and respect the cultural values and archaeological and geological features. The systemised design integrates an engineering methodology with an architectural approach to materiality to create a restrained ‘kit of parts’.

Left

The boardwalk is founded on steel screw piles; these are installed by hand thus reducing the need for an excavator to be used on the culturally and archaeologically sensitive site. The substructure is made from New Zealand supplied structural steel which is fully recyclable. Decking is a combination of FSC approved timber (tonka) and recyclable expanded steel mesh.

Working closely with the Tūpuna Maunga Authority we then applied the design system to the site contours and detailed a low impact structure in place of the previous track. The intent was to concentrate and contain visitors upon the boardwalk and let the land below them rest and heal (the previous aggregate track had become a network of uneven surfaces and deep ruts highly prone to erosion – in places the path had grown to a width of over six meters, scarring the ancestral mountain).

Left
The boardwalk alignment follows the contours of the crater rim, carefully winding through the tūāpapa (terraces) where the houses and gardens of the pā once sat and identifying the series of platforms and stopping points on route. This culminates in a 4.8m wide viewing deck at the lower northern tihi where visitors can take in sweeping panoramic views over downtown Auckland, Te Waitematā and Tāmaki Makaurau’s network of maunga.

Minimal disturbance to the tūpuna maunga during the boardwalk’s construction was achieved with foundation screwed into the ground by hand, meaning no digging was required (importantly, this technique is also reversible—the foundations can be removed in the future leaving no trace). Contractors carried materials by hand to locations onsite to ensure the lowest impact on the sacred mountain. All materials were selected are able to be fully recycled at the end of their life.

Left and above

The design utilises materials that will naturally weather over time and are permeable to the elements; allowing air, water and light to flow through the structure helps restore the wairua and mauri of Maungawhau.

The result of Stage 1 is a major achievement that demonstrates the unity of all involved around a shared vision. Stage Two will include narrowing of the upper tihi, pedestrianising of the access road, and reducing the carpark to a drop off zone. Once completed a series of viewing platforms will be strategically placed enroute to capture the expansive views and float over the earthworked terraces of the maunga.

Maungawhau and the other Tūpuna Maunga (ancestral mountains) of Tāmaki Makaurau are on a tentative list for UNESCO World Heritage status. A major part of a World Heritage bid is demonstrating that the unique heritage values are being properly protected; this sensitive design response does just that by subtly blending built form into the volcanic crater rim a physical connection to our inherent relationship with tangata and whenua.

Client
Tūpuna Maunga o Tāmaki Makaurau Authority

Collaborators
Stellar Projects
Chester Consultants

Contractor
HEB Construction