| Specimen ID | State | County | Locality | Year | HUC Number | Drainage Name | Status |
| 879796 | IN | Porter | Porter County | 2007 | 04040001 | Little Calumet-Galien | established |
| 1873541 | IN | Porter | Portage Burns | 2022 | 04040001 | Little Calumet-Galien | |
| 1873542 | IN | Porter | Portage Burns | 2022 | 04040001 | Little Calumet-Galien | |
| 1873543 | IN | Porter | Portage Burns | 2022 | 04040001 | Little Calumet-Galien | |
| 1873544 | IN | Porter | Portage Burns | 2022 | 04040001 | Little Calumet-Galien | |
| 1873545 | IN | Porter | Portage Burns | 2022 | 04040001 | Little Calumet-Galien | |
| 1873546 | IN | Porter | Portage Burns | 2022 | 04040001 | Little Calumet-Galien | |
| 1873547 | IN | Porter | Portage Burns | 2022 | 04040001 | Little Calumet-Galien | |
| 1873548 | IN | Porter | Portage Burns | 2022 | 04040001 | Little Calumet-Galien | |
| 1873549 | IN | Porter | Portage Burns | 2022 | 04040001 | Little Calumet-Galien | |
| 1873550 | IN | Porter | Portage Burns | 2022 | 04040001 | Little Calumet-Galien | |
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