 Seneca Quarry is now overgrown with sycamore trees, tulip poplars, and dense brush such as wild rose, such that it is impenetrable much of the year.It is best visited in winter.The property includes ruins of the stonecutting mill, located at "the Junction of Seneca Creek and the C&O Canal, just NW of the aqueduct"  and the restored quarry master's house, located within Seneca Creek State Park.