Pennyfield Lock – Black Rock Mill loop from Pennyfield Lock Neighborhood Conservation Area

Pennyfield Lock – Black Rock Mill loop from Pennyfield Lock Neighborhood Conservation Area

Moderate

4.8

(4406)

18,324

riders

Pennyfield Lock – Black Rock Mill loop from Pennyfield Lock Neighborhood Conservation Area

03:36

41.7km

350m

Gravel riding

Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: September 24, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Chesapeake and Ohio Canal National Historical Park

Seneca Creek State Park

Waypoints

Start point

Parking

Get Directions

567 m

Pennyfield Lock

Highlight • Monument

Lock 22, aka Pennyfield Lock, was built between 1829 and 1831, and the name came from the misspelling of the Pennifield family name. It has been restored and offers overnight stays to recreate the rustic feeling from that period.

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2.02 km

Dierrsen Wildlife Management Area

Nature Reserve

4.56 km

Inlet Lock

Lake

5.65 km

Riley’s lock

Highlight • Monument

Riley’s Lock is a fun, happening place. Every time I pass by it is bustling with activity. There are two row boat clubs along Seneca creek. There are kayak, jet …

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6.07 km

Seneca Quarry Stone Mill Ruins

Highlight • Historical Site

Built in 1837 by the Seneca Sandstone Company, this mill was created to process the distinctive red sandstone quarried nearby. Today, the ruins, easily spotted by their red sandstone walls, …

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6.24 km

Old Seneca Quarry Stone Mill

Highlight • Historical Site

Seneca Quarry provided the stone for hundreds of buildings in and around Washington DC. The stone was lilac grey when removed, but turned a red color over time.

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8.73 km

Seneca Bluffs Trail

Highlight (Segment) • Trail

This trail is ideal for hiking, running, and mountain biking due to its predominantly smooth terrain that doesn't feature many rocks or roots to navigate around. Throughout the majority of …

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11.3 km

Dry Seneca Creek Stream Crossing

Highlight • River

Crossing Dry Seneca Creek on stepping stones.

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19.2 km

Black Rock Mill

Highlight • Historical Site

Just the walls remain of the 1815 Black Rock saw- and gristmill in Seneca Creek State Park. The structure was stabilized and representations of mill machinery were added in 1980.

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20.8 km

Seneca Creek State Park

Highlight • Forest

Seneca Creek State Park is a beautiful place to ride, especially during the fall when the landscape comes alive with color. Film fans might recognize it as a filming location for 'The Blair Witch Project'. Maybe don't visit at night...?

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