Summary
This paper gives an overview of biological and other environmental monitoring data from Lake Vansjø in the Morsa river basin district, South-East Norway. The lake is impacted by eutrophication and has been subject to several nutrient abatement measures. The dataset comprises phytoplankon data at species level from 2005-2015, and water chemistry data from the period 1980-2015. The dataset is available online from NIVA's web portal AquaMonitor and will be updated regularly with new monitoring data.