Guarding Our Great Lakes Act

Guarding Our Great Lakes Act - Requires the Chief of Engineers, the Director of the U.S. Fish and Wildlife Service (USFWS), the Director of the U.S. Geological Survey (USGS), the Administrator of the Environmental Protection Agency (EPA), and each other applicable federal agency to take actions to prevent the transfer of aquatic invasive species, with a focus on Asian carp species, through the Brandon Road Lock and Dam on the Illinois River.

Directs the Chief to: (1) construct measures to prevent the upstream transfer of swimming aquatic invasive species through the Lock and Dam; and (2) submit a cost estimate for, and schedule for completion of, measures to be constructed.

Requires the Director of the USFWS to implement all appropriate measures in compliance with applicable state and federal law around the Lock and Dam to prevent the upstream and downstream transfer of swimming and floating aquatic invasive species, with a focus on Asian carp species.

Authorizes the Chief, the Director of the USFWS, and the Director of the USGS to acquire real estate to carry out this Act.

Directs the EPA Administrator, acting through the Great Lakes Interagency Task Force, to coordinate with the governor of Illinois, the city of Chicago, and the Metropolitan Water Reclamation District of Greater Chicago to carry out engineering and construction of flood mitigation and water quality measures on the Chicago Area Waterway System related to permanent prevention of the transfer of aquatic nuisance species between the Great Lakes and Mississippi River basins. Permits the federal share of the cost of a project to be up to 100%.