The dataset consists of water quality parameters that have been monitored on a weekly to monthly basis at three sites in Peel Inlet and central site in Harvey Estuary from August 1977 and another two in Harvey from March 1979 (Site locations shown in large thumbnail). These parameters include: Secchi depth and total depth; surface and bottom pH, salinity, temperature, dissolved oxygen, light attenuation coefficients (calculated from irradiance and depth), total nitrogen, total phosphorus, chlorophyll a, phaeophytin, ammonium, nitrate-nitrite, filterable reactive phosphate and silicate. Samples were taken from the surface and bottom.