| Specimen ID | 116230 |
| Group | Mollusks-Bivalves |
| Genus | Dreissena |
| Species | polymorpha |
| Common Name | zebra mussel |
| State | IL |
| County | Calhoun |
| Locality | Mississippi River, (upper R.M. 273.4) just above Lock & Dam No. 24, near Clarksville, MO |
| Mapping Accuracy | Accurate |
| HUC8 Name | The Sny |
| HUC8 Number | 07110004 |
| HUC10 Name | North Fritz Island-Mississippi River |
| HUC10 Number | 0711000407 |
| HUC12 Name | Calumet Creek-Mississippi River |
| HUC12 Number | 071100040703 |
| Map | |
| Collection Day | 10 |
| Collection Month | 1 |
| Collection Year | 1992 |
| Year Accuracy | Actual |
| Potential Pathway | hitch hiker on small watercraft |
| Status | established |
| Record Type | Personal communication |
| Freshwater/Marine | Freshwater |
| Number Collected | 31 |
| Size | 6.9 - 11.3 mm |
