| Specimen ID | State | County | Locality | Year | HUC Number | Drainage Name | Status |
| 246741 | MI | Sanilac | Sanilac County | 2008 | 04240002 | Lake Huron | collected |
| 1462199 | MI | Huron | Caseville County Park | 1930 | 04240002 | Lake Huron | established |
| 1467871 | MI | Mackinac | Round Island, South Side | 1980 | 04240002 | Lake Huron | established |
| 1467874 | MI | Presque Isle | Krakow township, West end of Thompsons Harbor | 1989 | 04240002 | Lake Huron | established |
| 1467904 | MI | Alpena | loading docks at old quarry site of Rockport | 1985 | 04240002 | Lake Huron | established |
| 1467907 | MI | Mackinac | Bois Blanc, Snow Beach | 1949 | 04240002 | Lake Huron | established |
| 1468030 | MI | Alpena | Thunder Bay Island | 1952 | 04240002 | Lake Huron | established |
| 1468307 | MI | Mackinac | Round Island, Bois Blanc | 1960 | 04240002 | Lake Huron | established |
| 1468779 | MI | Mackinac | Round Island, Bois Blanc | 1965 | 04240002 | Lake Huron | established |
| 1469066 | MI | Mackinac | Round Island, Bois Blanc | 1988 | 04240002 | Lake Huron | established |
| 1468952 | MI | Mackinac | Sand Bay, Bois Blanc | 1980 | 04240002 | Lake Huron | established |
| 1469077 | MI | Bay | Wenona Beach | 1927 | 04240002 | Lake Huron | established |
| 1469095 | MI | Chippewa | Drummond Island Yacht Haven | 1990 | 04240002 | Lake Huron | established |
| 1469104 | MI | Mackinac | Sandy Beach of Scotty Bay | 1924 | 04240002 | Lake Huron | established |
Citation for this information:
U.S. Geological Survey, 2026,
Agrostis gigantea: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov, Access Date: 1/17/2026