Muncaster's Mill on the North Branch of Rock Creek ground grain and sawed lumber. Its overshot wheel, 15 feet in diameter, turned three "runs" of stones for the fine grinding of flour. The large saw mill stands at left. The presence of mills in a community bespoke its prosperity: too bountiful a grain crop to be hand-ground at home. Typical of neighborhood mills, Muncaster's operated for approximately a century before closing down in the mid-1920s. Bowie's Mill, upstream on Flint Hill Farm, also was a grist and saw mill.