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McMahons Mill
Maryland Recreation Site
At Canal Mile 88 is a former private campground with campsites for recreational vehicles and tents. The site was located close to the Dam #4 boat ramp. A museum featured artifacts from the civil war era.
McMahons Mill sits at Mile 88.1 of the C&O Canal, a site whose history stretches back to its construction as a grist mill around 1778 and its long operation under a succession of owners until a 1922 flood forced its closure. The National Park Service acquired and restored the structure in the 1970s, preserving it as part of the Chesapeake & Ohio Canal National Historical Park. Today the area serves as both a historical landmark and a recreation hub: the towpath and nearby Big Slackwater section offer popular walking and cycling routes, and the mill area provides access to fishing, boating, and riverside camping. Recent NPS projects have also stabilized the towpath and stone retaining walls between McMahons Mill and Lock 42, improving reliability for visitors exploring this scenic stretch of the Potomac River.
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Contact Information
C&O Canal National Historic Park
142 W. Potomac St.
Williamsport MD 21795
301-739-4200
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