| Specimen ID | State | County | Locality | Year | HUC Number | Drainage Name | Status |
| 157164 | MN | St. Louis | Lake Superior, Duluth Harbor | 2001 | 04180000 | Lake Superior | established |
| 1709652 | MN | St. Louis | St. Louis River | 2017 | 04010201 | St. Louis | |
| 1709631 | MN | St. Louis | St. Louis River | 2017 | 04010201 | St. Louis | |
| 1709705 | MN | St. Louis | St. Louis River | 2018 | 04010201 | St. Louis | |
| 1709712 | MN | St. Louis | St. Louis River | 2018 | 04010201 | St. Louis | |
| 1709656 | MN | St. Louis | St. Louis River | 2018 | 04010201 | St. Louis | |
| 1709657 | MN | St. Louis | St. Louis River | 2018 | 04180000 | Lake Superior | |
| 1709658 | MN | St. Louis | St. Louis River | 2018 | 04180000 | Lake Superior | |
| 1709616 | MN | St. Louis | St. Louis River | 2016 | 04010201 | St. Louis | |
| 1709644 | MN | St. Louis | St. Louis River | 2017 | 04180000 | Lake Superior | |
| 1709704 | MN | St. Louis | St. Louis River | 2018 | 04180000 | Lake Superior | |
| 1709682 | MN | St. Louis | St. Louis River | 2018 | 04180000 | Lake Superior | |
| 1709683 | MN | St. Louis | St. Louis River | 2018 | 04180000 | Lake Superior | |
| 1709692 | MN | St. Louis | St. Louis River | 2018 | 04180000 | Lake Superior | |
| 1709703 | MN | St. Louis | St. Louis River | 2018 | 04180000 | Lake Superior | |
| 1709777 | MN | St. Louis | St. Louis River | 2019 | 04180000 | Lake Superior | |
| 1709778 | MN | St. Louis | St. Louis River | 2019 | 04180000 | Lake Superior | |
| 1709789 | MN | St. Louis | St. Louis River | 2019 | 04180000 | Lake Superior | |
| 1709837 | MN | St. Louis | St. Louis River | 2020 | 04180000 | Lake Superior | |
| 1709795 | MN | St. Louis | St. Louis River | 2020 | 04180000 | Lake Superior | |
| 1709796 | MN | St. Louis | St. Louis River | 2020 | 04180000 | Lake Superior | |
| 1709797 | MN | St. Louis | St. Louis River | 2020 | 04180000 | Lake Superior | |
| 1709847 | MN | St. Louis | St. Louis River | 2020 | 04180000 | Lake Superior | |
| 1709851 | MN | St. Louis | St. Louis River | 2020 | 04180000 | Lake Superior | |
| 1709654 | MN | St. Louis | St. Louis River | 2018 | 04010201 | St. Louis | |
| 1709668 | MN | St. Louis | St. Louis River | 2018 | 04010201 | St. Louis | |
| 1709753 | MN | St. Louis | St. Louis River | 2019 | 04180000 | Lake Superior | |
| 1709755 | MN | St. Louis | St. Louis River | 2019 | 04010201 | St. Louis | |
| 1709617 | MN | St. Louis | St. Louis River | 2016 | 04010201 | St. Louis | |
| 1709620 | MN | St. Louis | St. Louis River | 2016 | 04010201 | St. Louis | |
| 1709634 | MN | St. Louis | St. Louis River | 2017 | 04180000 | Lake Superior | |
| 1709655 | MN | St. Louis | St. Louis River | 2018 | 04010201 | St. Louis | |
| 1709661 | MN | St. Louis | St. Louis River | 2018 | 04010201 | St. Louis | |
| 1709662 | MN | St. Louis | St. Louis River | 2018 | 04010201 | St. Louis | |
| 1709663 | MN | St. Louis | St. Louis River | 2018 | 04180000 | Lake Superior | |
| 1709664 | MN | St. Louis | St. Louis River | 2018 | 04180000 | Lake Superior | |
| 1709665 | MN | St. Louis | St. Louis River | 2018 | 04180000 | Lake Superior | |
| 1709710 | MN | St. Louis | St. Louis River | 2018 | 04180000 | Lake Superior | |
| 1709718 | MN | St. Louis | St. Louis River | 2019 | 04010201 | St. Louis | |
| 1709723 | MN | St. Louis | St. Louis River | 2019 | 04010201 | St. Louis | |
| 1709729 | MN | St. Louis | St. Louis River | 2019 | 04010201 | St. Louis | |
| 1709731 | MN | St. Louis | St. Louis River | 2019 | 04010201 | St. Louis | |
| 1709732 | MN | St. Louis | St. Louis River | 2019 | 04010201 | St. Louis | |
| 1709733 | MN | St. Louis | St. Louis River | 2019 | 04010201 | St. Louis | |
| 1709754 | MN | St. Louis | St. Louis River | 2019 | 04180000 | Lake Superior | |
| 1709756 | MN | St. Louis | St. Louis River | 2019 | 04180000 | Lake Superior | |
| 1709757 | MN | St. Louis | St. Louis River | 2019 | 04010201 | St. Louis | |
| 1709856 | MN | St. Louis | St. Louis River | 2020 | 04010201 | St. Louis | |
| 1710221 | MN | St. Louis | St. Louis River | 2015 | 04010201 | St. Louis | |
| 1710223 | MN | St. Louis | St. Louis River | 2015 | 04010201 | St. Louis | |
| 1710224 | MN | St. Louis | St. Louis River | 2015 | 04010201 | St. Louis | |
| 1710228 | MN | St. Louis | St. Louis River | 2015 | 04010201 | St. Louis | |
| 1710232 | MN | St. Louis | St. Louis River | 2015 | 04010201 | St. Louis | |
| 1710237 | MN | St. Louis | St. Louis River | 2015 | 04010201 | St. Louis | |
| 1710209 | MN | St. Louis | Harbor Cove Marina | 2015 | 04180000 | Lake Superior | |
| 1710210 | MN | St. Louis | Lakehead Boat Basin | 2015 | 04180000 | Lake Superior | |
| 1710220 | MN | St. Louis | Lakehead Boat Basin | 2015 | 04180000 | Lake Superior | |
| 1710222 | MN | St. Louis | St. Louis River | 2015 | 04010201 | St. Louis | |
| 1710236 | MN | St. Louis | St. Louis River | 2015 | 04010201 | St. Louis | |
| 1710239 | MN | St. Louis | St. Louis River | 2015 | 04010201 | St. Louis | |
Citation for this information:
U.S. Geological Survey, 2025,
Gammarus fasciatus: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov, Access Date: 12/20/2025