Good Harbor Reef Bathymetry

In March 2024, USGS scientists began mapping bathymetry on Good Harbor Reef in Lake Michigan using multi-beam sonar. Lighter colors indicate shallower waters; boxes indicate the boundaries of two 10,000 m² experimental comparative plots, one of which will be treated to remove mussels. When combined with before- and after-treatment data about lake whitefish movements, egg deposition, and larval fish emergence, scientists will be able to test the effectiveness of the treatments to improve conservation of the species. Credit: USGS.