| Specimen ID | State | County | Locality | Year | HUC Number | Drainage Name | Status |
| 1322483 | WI | Door | Fish Creek, Green Bay, Lake Michigan, near public boat ramp | 2016 | 04190000 | Lake Michigan | established |
| 1322637 | WI | Door | Rowley Bay, Lake Michigan, near public boat ramp | 2016 | 04190000 | Lake Michigan | established |
| 1322641 | WI | Door | Sister Bay, Green Bay, near public boat ramp | 2016 | 04190000 | Lake Michigan | established |
| 1424569 | WI | Door | Lake Michigan - Rowleys Bay Access | 2016 | 04190000 | Lake Michigan | established |
| 1568939 | WI | Door | [No locality description provided] | 2016 | 04190000 | Lake Michigan | established |
| 1568952 | WI | Door | [No locality description provided] | 2016 | 04190000 | Lake Michigan | established |
| 1568957 | WI | Door | [No locality description provided] | 2016 | 04190000 | Lake Michigan | established |
| 1669773 | WI | Door | Sturgeon Bay | 2016 | 04190000 | Lake Michigan | unknown |
| 1669774 | WI | Door | Sturgeon Bay | 2016 | 04190000 | Lake Michigan | unknown |
| 1669775 | WI | Door | Sturgeon Bay | 2016 | 04190000 | Lake Michigan | unknown |
| 1669777 | WI | Door | Sturgeon Bay | 2016 | 04190000 | Lake Michigan | unknown |
Citation for this information:
U.S. Geological Survey, 2025,
Nitellopsis obtusa: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov, Access Date: 12/4/2025