Aka Mohn’s Mill
William Bard built a log mill here sometime in the 1700s. William Mohn built the current structure in 1848. The County Line Mill is now part of the Bollman Hat Factory and is barely recognizable as a mill.
| Built | 1848 |
| Structure | 3.5 Story Stone |
| Dimensions | 40×60 |
| Type | Flour/Grist/Saw |
| Headrace | 1,000 feet |
| Tailrace | 300 feet |
| Dam Height | 4 feet |
| Power | 1 Overshot |
| Capacity | 10 bbl / day |
| SPOOM | PA-036-001 |
| Water Source | Little Muddy Creek |
| Watershed | Little Muddy Creek |
| Township | Adamstown Borough |
| Location | 40.245510, -76.049997 |