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Current data are based on monitoring records since 1995. Historical data are based on records collected from about 1930 to 1995.
The graphs show change in the number of sinter depositing springs and active geysers in the past 50 years. Over half of the region’s geysers and sinter depositing springs have ceased activity or have been destroyed. Most of these features were lost after the Wairakei power station was commissioned in 1958 and Lake Ohakuri was created in 1961 as part of the Waikato River Hydro Scheme.
Many of our remaining springs and geysers have been significantly modified by human activity. As a result, natural features such as sinter terraces are becoming increasingly rare in many geothermal fields.