Search for "great lakes".

Extensive database offering data download packages for a wide range of topics related to the Great Lakes, including administrative boundaries, benthos, fish species location and spawning, invasive species, submerged aquatic vegetation, zooplankton, water chemistry, bathymetry, lake bottom slope, hydrogeoforms, shorelines, fish access, coastal wetlands, bedrock geology, quaternary geology, land use & cover, population, roads, soils, mechanical energy, buoy locations, fetch, offshore circulation, upwelling, wave action, surface temperature and spring rate of warming.