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Routes
Bike touring routes & trails
United States
Maryland
Montgomery County
Gaithersburg

Black Rock Mill – Seneca Quarry Stone Mill Ruins loop from Metropolitan Grove

Routes
Bike touring routes & trails
United States
Maryland
Montgomery County
Gaithersburg

Black Rock Mill – Seneca Quarry Stone Mill Ruins loop from Metropolitan Grove

Hard

3.1

(9)

59

riders

Black Rock Mill – Seneca Quarry Stone Mill Ruins loop from Metropolitan Grove

05:28

62.4km

540m

Cycling

Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: April 17, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Chesapeake and Ohio Canal National Historical Park

Seneca Creek State Park

Quince Orchard Valley Neighborhood Park

Kentlands Lakes Park

Waypoints

A

Start point

Train Station

Get Directions

1

14.4 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

2

16.0 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

3

30.9 km

Crossing Dry Seneca Creek on stepping stones.

Tip by

4

36.1 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, are accessible via the C&O Canal towpath and are especially visible during the winter months when vegetation is dormant.

Tip by

37.6 km

Inlet Lock

Lake

40.1 km

Dierrsen Wildlife Management Area

Nature Reserve

7

41.6 km

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

44.2 km

Blockhouse Point Conservation Park

Nature Reserve

9

57.3 km

Kentlands Lakes Park Pathway

Highlight • Trail

The Kentlands Lakes Park area is definitely an ideal place to ride by, as it's a nature oasis in the midst of the city. Along this section of the path between the lakes, you can enjoy views of the water on both sides. If you like, you can even take a break and sit on one of the benches in front of the water.

Tip by

B

62.4 km

End point

Train Station

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Way Types & Surfaces

Way Types

45.0 km

9.12 km

3.72 km

2.94 km

859 m

384 m

384 m

Surfaces

46.4 km

11.2 km

3.07 km

1.54 km

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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 (140 m)

Lowest point (50 m)

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Weather

Powered by Foreca

Today

Wednesday 20 May

33°C

20°C

69 %

Additional weather tips

Max wind speed: 22.0 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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