Pennyfield Lock Access offers a boat launching ramp for small boats at the parking area, with boats able to enter Muddy Branch and pass through a stone viaduct under the canal for access to the Potomac River.

The site features a graded gravel and sand parking area, restrooms, and picnic tables, and is accessible via Pennyfield Lock Road off River Road in Montgomery County.

The location is part of the C&O Canal National Historic Park and is popular for both fishing and paddling, with additional nearby amenities including the restored Pennyfield Lock House available for overnight stays through the Canal Quarters program.