Rock Run Grist MillGet Directions Details Details Stone mill with 12-ton water wheel, which runs on a limited basis. Hours See website for hours. LocationSusquehanna State ParkStafford RdHavre de Grace, MD21078Get DirectionsContact Local Phone: 410-836-6735MapCentral MarylandPlaces NearbyAccommodationsGreat Wolf Lodge MarylandLearn MoreAttractions, Accommodations, & DiningRed Roof Inn-PerryvilleLearn MoreAttractions, Accommodations, & DiningBed and Breakfast at Rolling Hills RanchLearn MoreAttractions, Accommodations, & DiningSuper 8 by Wyndham-Havre de GraceLearn MoreAttractions, Accommodations, & DiningBest Budget Inn-Havre de GraceLearn MoreSee More For Central Maryland