Ehrhart's Mill Historic District is a national historic district located along Saucon Creek at Lower Saucon Township, Northampton County, Pennsylvania. The district includes 9 contributing buildings, 2 contributing sites, and 4 contributing structures associated with a 19th and early 20th century grist mill. The buildings include a small barn, the stone grist mill (destroyed), and three stone or brick vernacular houses. The mill is a three-story, five level stone building with a slate covered gambrel roof. The most prominent structure is an iron Pratt truss bridge built in 1867, and known as County Bridge #16. The mill was destroyed by fire.
It was added to the National Register of Historic Places in 1987.