Big Muddy is located in Symonds Bay on the northern coast of the Manukau Harbour. This site is close to the outflow of the Williams Stream, which drains out below the Lower Nihotupu Reservoir. As the name suggests, this site is muddy, comprising around 80% of the site’s sediment. First monitored in 1998, this site has been sampled nine times at various intervals, most recently in 2021.
Big Muddy currently has low levels of metal contamination and marginal ecological health.
Monitored site results
This dashboard shows information on the data collected by the regional councils and unitary authorities for the Estuary health scientific indicators, click the tiles for more information: