| Specimen ID | 262079 |
| Group | Mollusks-Bivalves |
| Genus | Dreissena |
| Species | rostriformis |
| Subspecies | bugensis |
| Common Name | quagga mussel |
| State | CA |
| County | Orange |
| Locality | Walnut Canyon Reservoir [E of Anaheim] |
| Mapping Accuracy | Accurate |
| HUC8 Name | Santa Ana |
| HUC8 Number | 18070203 |
| HUC10 Name | Lower Santa Ana River |
| HUC10 Number | 1807020310 |
| HUC12 Name | Walnut Canyon-Santa Ana River |
| HUC12 Number | 180702031002 |
| Map | |
| Collection Day | 21 |
| Collection Month | 7 |
| Collection Year | 2009 |
| Year Accuracy | Actual |
| Potential Pathway | hitch hiker on small watercraft |
| Status | established |
| Record Type | NAS sighting report |
| Freshwater/Marine | Freshwater |
| Year Class | juvenile |
