Observations of currents and near-surface temperatures from Lake Superior reveal a surprisingly rich field of eddies that extended throughout the water column and were present throughout the lake and during all seasons. Despite their ubiquity, the lake eddies have previously gone unreported in the literature. These observations of the eddy velocities and surface temperatures suggest that we have to revise our conceptual understanding of the vertical and horizontal transport mechanisms within large lakes to take into account persistent mesoscale turbulence.