| Specimen ID | 116197 |
| Group | Mollusks-Bivalves |
| Genus | Dreissena |
| Species | polymorpha |
| Common Name | zebra mussel |
| State | IL |
| County | Putnam |
| Locality | Illinois River (R.M. 208.9), near LTV Steel County intake north of Hennepin, IL |
| Mapping Accuracy | Accurate |
| HUC8 Name | Lower Illinois-Senachwine Lake |
| HUC8 Number | 07130001 |
| HUC10 Name | Allforks Creek-Illinois River |
| HUC10 Number | 0713000108 |
| HUC12 Name | Depue Lake-Illinois River |
| HUC12 Number | 071300010804 |
| Map | |
| Collection Day | 20 |
| Collection Month | 9 |
| Collection Year | 1991 |
| Year Accuracy | Actual |
| Potential Pathway | hitch hiker on small watercraft |
| Status | established |
| Comments | Seven individuals found two weeks later. |
| Record Type | Specimen |
| Disposal | formalin |
| Museum Cat Number | INHS 13137 |
| Verifier | K.Douglas Blodgett,IL Nat.Hist.Surv., Havana IL 62 |
| Freshwater/Marine | Freshwater |
| Number Collected | 3 |
| Year Class | juvenile |
| Size | 4.8-5.6 mm |
