Water chemistry, stable isotopes, and trace metals in sediment, water and biota in Torch Lake and Gratiot Lake, Keweenaw Peninsula, Michigan, USA, July and October 2021

This data release includes sampling location data, laboratory processed surface water chemistry data (anions, cations, total nitrogen, dissolved organic carbon, deuterium, trace metals), laboratory processed pore water chemistry data (anions, cations, total nitrogen, dissolved organic carbon, trace metals), laboratory process sediment data (trace metals), and whole-body trace metal concentrations plus stable isotope values (carbon, nitrogen, deuterium) for larval aquatic insects, emergent adult insects, and two riparian spider families from Torch Lake and Gratiot Lake (N=3 sites at each lake). Torch Lake (Houghton County, Keweenaw Peninsula, Michigan, USA) is a Great Lakes Area of Concern (AOC) owing to a high concentration of Cu and other co-occurring metals from historic mining operations, while no mining or processing activity has taken place in the nearby Gratiot Lake basin (Keweenaw County, Keweenaw Peninsula, Michigan, USA).