Dalecarlia Tunnel – Swains Lock loop from Tenleytown–AU

Mountain biking trails

United States

District Of Columbia

Dalecarlia Tunnel – Swains Lock loop from Tenleytown–AU

Moderate

2.8

(21)

riders

Dalecarlia Tunnel – Swains Lock loop from Tenleytown–AU

04:15

59.4km

300m

Mountain biking

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: August 19, 2026

Tips

Includes a segment in which cycling is not permitted

After 9.32 km for 310 m

Waypoints

Start point

Train Station

Get Directions

4.09 km

Dalecarlia Tunnel

Highlight • Structure

The Dalecarlia Tunnel runs the Capital Crescent Trail under the Washington Aqueduct and MacArthur Boulevard. It was built in 1910 as a railway tunnel and is now over 100 years old.

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4.72 km

Wagshal's Grand Bodega

Highlight • Cafe

Great inexpensive food, close to the C&O and Crescent trails.

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5.65 km

Lock 6, Chesapeake and Ohio Canal

Highlight • Monument

One of the locks (#6 of 75) on the Chesapeake and Ohio Canal. These should ensure the shipping traffic between Cumberland and Washington to transport coal.
The lock keeper's houses …

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6.36 km

Little Falls Dam

Highlight • Monument

The Little Falls Dam is a low dam built in the Potomac in 1959. It now separates the Upper Potomac River and Lower Potomac River, forming the Little Falls Reservoir. …

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9.47 km

Cedar Island Conservation Park

Nature Reserve

13.5 km

Chesapeake and Ohio Canal

Lake

18.0 km

Widewater

Lake

20.0 km

Start of the Great Falls Foot Trail

Highlight • Trail

The Great Falls of the Potomac is a place with various rapids and small falls in the Potomac. The place marked here may only be entered on foot. Bicycles and dogs 😜 must stay outside.

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24.2 km

Swains Lock

Highlight • Historical Site

These are hard to come by along the C&O canal and usually hidden. Always nice to know where to get water.

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30.5 km

Dierrsen Wildlife Management Area

Nature Reserve

31.9 km

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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