Environmental change in Lake Champlain revealed by long-term monitoring

► Monitoring data on Lake Champlain documented water quality changes, 1964-2009. ► Secchi disk transparency increased after zebra mussel invasion. ► Total phosphorus trends were variable but total nitrogen decreased lakewide. ► Summer water temperature, sodium, chloride, and cyanobacteria increased. ► No change in hypolimnetic dissolved oxygen.