Gunpowder Falls begins in Manheim Township about a mile north of the Maryland line and flows south-east through Maryland until it flows into the Gunpowder River near Baltimore where it becomes part of the Chesapeake Bay. Little Falls is a tributary of Gunpowder Falls.
| Name | AKA | Disposition | First Mill | Water Source | Township | Coordinates |
|---|---|---|---|---|---|---|
| Houck’s | A. H. Wentz | Site | Gunpowder Falls | Manheim | 39.72093, -76.84461 | |
| Smith | Site | Unnamed Trib. of Little Falls | Shrewsbury | 39.72193, -76.71745 |