Great Lakes CommissionA layer indicating the farthest historic upstream observation of sea lamprey larvae based on surveys conducted by the Larval Assessment Task Force. Lines were generated using survey point data as input for geometric network analysis along the NHD hydro network.Shapefilehttps://geodata.wisc.edu/catalog/2E8B7F1D-B039-4B0C-BCFC-9DA004EEBC37engPublicBiotaSea Lamprey Larval Max Extent, Great Lakes Region 2017DatasetsWisconsin2017UW-Madison Robinson Map Library