| Specimen ID | State | County | Locality | Year | HUC Number | Drainage Name | Status |
| 1457435 | MI | | St. Clair River | 1991 | 04090001 | St. Clair | established |
| 1912726 | MI | St. Clair | Lake Erie, at St. Clair River, MI/ON | 2021 | 04090001 | St. Clair | |
| 1918928 | MI | St. Clair | Lake Erie, at St. Clair River, MI/ON | 2023 | 04090001 | St. Clair | |
| 1920920 | MI | St. Clair | Lake Erie, at St. Clair River, MI/ON | 2024 | 04090001 | St. Clair | |
| 1920961 | MI | St. Clair | Lake Erie, at St. Clair River, MI/ON | 2024 | 04090001 | St. Clair | |
| 1924008 | MI | St. Clair | Lake Erie, at St. Clair River, MI/ON | 2025 | 04090001 | St. Clair | |
| 1924011 | MI | St. Clair | Lake Erie, at St. Clair River, MI/ON | 2025 | 04090001 | St. Clair | |
Citation for this information:
U.S. Geological Survey, 2026,
Osmerus mordax: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov, Access Date: 6/4/2026