GLANSIS Tools
Explore our database using interactive tools to generate custom species lists, map historical distributions, access risk assessments, and locate watersheds.
Species List Generator
Filter the GLANSIS database by taxonomy, location (lake or watershed), invasion status, and pathway to generate a custom species list and access individual fact sheets.
Launch List GeneratorMap Explorer
Visualize and compare the spatial distribution of up to three species across the Great Lakes basin over time. Overlay collections data on top of habitat layers.
Launch Map ExplorerRisk Assessment Clearinghouse
Access a centralized repository of risk assessments conducted by GLANSIS and partner agencies for species either in or threatening the Great Lakes.
View Risk AssessmentsHUC8 Lookup Tool NEW
Find your specific 8-digit Hydrologic Unit Code (HUC8) watershed by searching your address, city, or zip code. Download printable maps with nearby watersheds labeled.
Launch HUC8 Lookup