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Routes
United States
Maryland
Montgomery County
Darnestown

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

Routes
United States
Maryland
Montgomery County
Darnestown

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: March 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

A

Start point

Parking

Get Directions

1

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.

Tip by

2.02 km

Dierrsen Wildlife Management Area

Nature Reserve

4.56 km

Inlet Lock

Lake

4

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 …

Tip by

5

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, …

Tip by

6

8.68 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 …

Tip by

7

11.2 km

Crossing Dry Seneca Creek on stepping stones.

Tip by

8

19.1 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.

Tip by

9

20.7 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...?

Tip by

10

41.3 km

This is a very picturesque area, with the bridge, the creek, and the house up the hill beyond the field.

Tip by

B

41.7 km

End point

Parking

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Way Types & Surfaces

Way Types

34.4 km

4.11 km

2.26 km

636 m

310 m

Surfaces

39.7 km

1.81 km

170 m

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (130 m)

Lowest point (50 m)

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Weather

Powered by Foreca

Today

Thursday 21 May

21°C

13°C

87 %

Additional weather tips

Max wind speed: 15.0 km/h

to get more detailed weather forecasts along your route

Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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