Earthquake is the most significant natural hazard for Hāwea. Hāwea Flat also has a moderate flood risk. Other hazards exist but are lower priority for household preparedness. This page summarises what is known about the main risks and what makes Hāwea geographically distinct.
The Alpine Fault runs the length of the Southern Alps, around 100 km west of Hāwea. According to AF8 (the Alpine Fault research programme), there is a 75% probability of an Alpine Fault earthquake in the next 50 years, with a four in five chance it will be magnitude 8 or greater. An earthquake on this scale would be around 500 times more powerful than the 2011 Christchurch earthquake, felt by all New Zealanders. Shaking would last up to two minutes, causing widespread landslides, cutting off roads, and disrupting power and telecommunications.
The most recent large Alpine Fault earthquake occurred in 1717. The average interval between events is around 330 years — but the gap between events has ranged from 140 to 510 years.
A major Alpine Fault event is likely within the lifetime of current Hāwea residents.
In April 2025, a 4.3 magnitude earthquake was felt in Lake Hāwea — a reminder that the area is seismically active and that preparedness is not theoretical.
Two further fault lines run directly through the Hāwea area:
The North Cardrona Fault crosses the western corner of Lake Hāwea township
The Grand View Fault crosses through Hāwea Flat
These local faults have not ruptured for thousands of years, but in a major Alpine Fault earthquake they may also move.
A Hāwea household should plan on the basis that the ground will shake violently for several minutes, that infrastructure (power, water, communications, roads) will be disrupted, and that outside help will not arrive quickly.
Hāwea has two fault lines running through the community.
The North Cardrona Fault runs through the western corner of Lake Hāwea.
Hāwea is at the end of the road. State Highway 6 between Wānaka and Hāwea is the only sealed route in or out, and it has three points of vulnerability in a major earthquake:
Maungawera Hill is likely to be blocked by slips and fallen trees. This is the section between the Hāwea River bridge and the dam.
The dam crossing into Lake Hāwea township could be affected by a slip from the hill above, and could also experience wave topping if a landslide enters the lake further north (see Lake-edge wave risk below).
The Albert Town and Luggate bridges between Wānaka and SH6 may not be usable.
Households should not assume they can drive in or out of Hāwea after a major event. See Cannot Get Home for more on what this means in practice.
SH6 in and out of Hāwea would likely be affected.
Maungawera Hill — slips and fallen trees may limit road access to Lake Hāwea.
The dam entrance to Lake Hāwea — slip and wave-topping risks.
A major earthquake could cause landslides into Lake Hāwea, generating waves that move quickly across the water. Properties at lake level are particularly exposed. John Creek — the small lakeside settlement at the northeast corner of the lake, reached via Gladstone Road — sits at lake edge and at a lower elevation than Lake Hāwea township, making it the most vulnerable area.
A wave-topping event at the dam could also push water down the Hāwea River channel. The bike track along the Hāwea River runs along this corridor. Do not use the river or riverbank as a route after a major earthquake — keep well away from the river channel.
Residents in lake-edge areas should plan to move to higher ground immediately after significant shaking. Do not wait for an official warning — by the time a wave is visible, there is no time to move.
See John Creek Warnings for the specific advice for that area.
Hāwea Flat has a moderate flood risk. The lowest-lying areas, including parts of the Domain, are where surface water pools during heavy rainfall events. Lake Hāwea township is at higher elevation and at lower flood risk.
Residents on Hāwea Flat should know whether their property sits inside the flood zone, and what the local water flow looks like during a heavy rain event.
The Natural Hazards Portal (Toka Tū Ake) maintains a national flood hazard map that lets you check any address in New Zealand:
Flood hazard across Aotearoa New Zealand — search by address
The Hāwea flood zone. Water pools across Hāwea Flat and the Domain in heavy rainfall events.
Hāwea Community Resilience Group covers Lake Hāwea township, Hāwea Flat, John Creek, and the rural land between them. If you live or own property inside this boundary, this site is for you.
The Hāwea area covered by Hāwea CRG.
AF8 — Alpine Fault 8 — Alpine Fault science, scenarios, and household preparation
Natural Hazards Portal — official national hazard maps (earthquake, flood, landslide, tsunami)
Otago Regional Council Natural Hazards Map — Otago-specific hazard mapping
QLDC Hazard Information — district-level hazard information
Last reviewed: May 2026.