| Specimen ID | State | County | Locality | Year | HUC Number | Drainage Name | Status |
| 230195 | IN | Lake | Lake Michigan, Hammond | 1996 | 04190000 | Lake Michigan | established |
| 1555688 | IN | Lake | [No locality description provided] | 2013 | 04190000 | Lake Michigan | established |
| 1560803 | IN | Lake | [No locality description provided] | 2014 | 04190000 | Lake Michigan | established |
| 1873437 | IN | Lake | East Chicago | 2022 | 04190000 | Lake Michigan | |
| 1873438 | IN | Lake | East Chicago | 2022 | 04190000 | Lake Michigan | |
| 1873439 | IN | Lake | East Chicago | 2022 | 04190000 | Lake Michigan | |
| 1873467 | IN | Lake | East Chicago | 2022 | 04190000 | Lake Michigan | |
| 1873468 | IN | Lake | East Chicago | 2022 | 04190000 | Lake Michigan | |
| 1873469 | IN | Lake | East Chicago | 2022 | 04190000 | Lake Michigan | |
| 1873470 | IN | Lake | East Chicago | 2022 | 04190000 | Lake Michigan | |
| 1873540 | IN | Porter | Portage Burns | 2022 | 04190000 | Lake Michigan | |
Citation for this information:
U.S. Geological Survey, 2025,
Myriophyllum spicatum: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov, Access Date: 12/5/2025