Blockhouse: A Moderate 8-Mile Hike Near Potomac, MD

Blockhouse: A Moderate 8-Mile Hike Near Potomac, MD

Set within the stunning Blockhouse Point Conservation Park—consistently ranked among the best natural areas in the Montgomery County Park system—this hike offers a rich blend of biodiversity and quiet history. As you hike, you’ll trek through mature upland and floodplain forests, passing tranquil streams and unique river-rock outcrops. The area is a sanctuary for diverse wildlife and serves as a rare botanical haven, home to at least nine species of threatened or endangered plants. While the park’s rugged terrain once served as a strategic wartime transportation route for supplies, it remains a peaceful retreat today.

The park’s name and historical significance are rooted in the American Civil War, specifically the year 1862. Following the Battle of Antietam, the Union Army constructed a series of blockhouses—sturdy timber fortifications—along the bluffs to defend the vital Potomac River crossings and the C&O Canal from Confederate raids. These outposts were manned by the 19th Massachusetts Volunteer Infantry, who kept a watchful eye on the supply lines into Washington, D.C. While the site was high-stakes and strategically vital, it is a rare historical gem because it never saw an actual skirmish; the soldiers spent their time on picket duty and reconnaissance rather than combat. Today, eagle-eyed hikers can still find the subtle earthen mounds and remnants of the foundations where these defensive structures once stood, serving as silent monuments to the soldiers who guarded the river.

The hike begins in the deep woodlands before descending toward the C&O Canal Towpath. As you walk along the water’s edge, keep an eye out for sunbathing turtles and elegant Blue Herons while soaking in sweeping views of the Potomac River. The route also offers a glimpse into the region’s industrial past as you pass by the historic Violet’s and Pennyfield Locks. To cap off the journey, the trail climbs back into the shaded forest, culminating in a series of magnificent vistas. Be sure to pack a lunch or a snack to enjoy at the Blockhouse Overlook, where you can relax and take in one of the most grand perspectives of the river valley below.

Time to Meet: Please meet at 9:15 for introductions and sign in. We will start hiking promptly at 9:30

Directions to Trailhead: The address is 14750 MD-190 · Potomac, MD, which is 6.5 miles north out of Potomac Village, Maryland on River Road

GPS Coordinates: 39.066198, -77.304711

Contact Information: Please use the comments feature for routine comments and questions. The hike Leader is Tim; 202-744-0289. Call or text as needed.

Details
Rating: Moderate
Distance: 8 miles
Elevation Gain: 600 feet
Pace: 2.0 to 2.5 miles per hour

Facilities: Portable bathrooms about two miles into the hike

Fees: No entrance fees

Cancellation: In the unlikely event that the hike needs to be cancelled, it may be cancelled up to the evening before the hike. Hikers will be notified through comments on this posting.

Weather: The weather for this location can be found here.

Notes:
-Please note, you must sign up at by 8:00 PM the day before the hike.
-Please do not show up unregistered.
-Please keep this a fragrance free event.
-To find out more about PATC, click here.
-Consider becoming a member of PATC. To join, click here.