| Specimen ID | State | County | Locality | Year | HUC Number | Drainage Name | Status |
| 253857 | WI | Door | Lake Michigan, in Green Bay south of Egg Harbor in Frank E. Murphy State Park | 2008 | 04190000 | Lake Michigan | collected |
| 1421424 | WI | Milwaukee | Milwaukee Harbor, WI | 2016 | 04190000 | Lake Michigan | established |
| 1421425 | WI | Milwaukee | Milwaukee Harbor, WI | 2016 | 04190000 | Lake Michigan | established |
| 1421426 | WI | Milwaukee | Milwaukee Harbor, WI | 2016 | 04190000 | Lake Michigan | established |
| 1421427 | WI | Milwaukee | Milwaukee Harbor, WI | 2016 | 04190000 | Lake Michigan | established |
| 1421429 | WI | Milwaukee | Milwaukee Harbor, WI | 2016 | 04190000 | Lake Michigan | established |
| 1421431 | WI | Milwaukee | Milwaukee Harbor, WI | 2016 | 04190000 | Lake Michigan | established |
| 1556576 | WI | Racine | [No locality description provided] | 2013 | 04190000 | Lake Michigan | established |
| 1926671 | WI | Door | Lake Michigan | 2010 | 04190000 | Lake Michigan | |
| 1925464 | WI | Ozaukee | Lake Michigan | 2010 | 04190000 | Lake Michigan | |
| 1926632 | WI | Kenosha | Lake Michigan | 2010 | 04190000 | Lake Michigan | |
Citation for this information:
U.S. Geological Survey, 2026,
Echinogammarus ischnus: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov, Access Date: 6/4/2026