Dalecarlia Tunnel on the Capital Crescent Trail
Dalecarlia Tunnel on the Capital Crescent Trail
Highlight (Segment) • Structure
Road cycling
5.0
(41)
The Dalecarlia Tunnel is a historic and distinctive man-made structure located in Brookmont, Montgomery County, Maryland, serving as a key feature of the popular Capital Crescent Trail. This former railroad tunnel, originally built in 1910, now provides a scenic and shaded passage for cyclists, runners, and walkers beneath MacArthur Boulevard and the Washington Aqueduct, close to the Dalecarlia Reservoir which supplies drinking water to Washington, D.C. Its Roman arch design and brick-lined interior offer a unique blend of historical significance…
Cycling is not permitted along parts of this segment
This Highlight goes through a protected area
Please check local regulations for:
Tips
October 6, 2020
Road cycling

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Distance 6.18 km
Downhill 70 m
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Wednesday 6 May
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16°C
44 %
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Max wind speed: 24.0 km/h
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Many cyclists and walkers enjoy the section of the Capital Crescent Trail that passes through the Dalecarlia Tunnel. Popular routes often extend from the tunnel towards Bethesda or Georgetown, offering a scenic and mostly flat journey. The trail is 11 miles long in total, connecting Georgetown, D.C., to Silver Spring, Maryland, allowing for various out-and-back or one-way trips.
Yes, the Capital Crescent Trail, particularly the section around the Dalecarlia Tunnel, is known for its ease of use. It features a smooth, paved surface and is mostly flat, with a gentle downhill grade when approaching from the Bethesda direction. This makes it ideal for beginners, families, and anyone looking for a relaxed walk, run, or bike ride.
The Dalecarlia Tunnel measures 340 feet (100 meters) long and 18 feet (5.5 meters) wide. It's a Roman arch structure, lined with brick throughout its interior, and features decorative brick facings at both entrances. Inside, you can still see recessed alcoves that historically provided shelter for railroad workers. In 2023, LED lighting was installed, ensuring it's well-lit and safe for all users.
Yes, the Capital Crescent Trail is dog-friendly. While specific leash rules can vary slightly by jurisdiction, it is generally required that dogs be kept on a leash at all times for the safety and comfort of all trail users. Please ensure you clean up after your pet.
While the trail is enjoyable year-round, the spring brings vibrant blooms along the path, and the fall offers spectacular foliage, making these seasons particularly picturesque. The tunnel itself provides a cool respite during warmer months and a sheltered passage during cooler weather, enhancing the experience regardless of the season.
The Capital Crescent Trail is known for its smooth, paved surface and mostly flat grade, which generally makes it accessible for wheelchairs. The Dalecarlia Tunnel itself is wide and well-lit, providing a clear path. However, it's always advisable to check current conditions for any temporary obstructions or maintenance.
Parking is available at various points along the Capital Crescent Trail. For direct access to the Dalecarlia Tunnel area, you can look for parking near MacArthur Boulevard or other designated trailheads in Brookmont, Maryland, or further along the trail in Bethesda or Georgetown. Parking can fill up quickly, especially on weekends.
While there aren't cafes directly at the tunnel entrance, the Capital Crescent Trail connects to urban areas like Bethesda and Georgetown, which offer a wide array of cafes, restaurants, and other amenities. Many trail users plan their trips to include a stop in these areas for refreshments or a meal.
The Capital Crescent Trail is a very popular recreational path, and the section around the Dalecarlia Tunnel can get quite crowded, especially on weekends and during peak seasons. If you prefer a quieter experience, consider visiting during weekday mornings or later in the afternoon.
The Dalecarlia Tunnel was originally constructed in 1910 as part of the Georgetown Branch of the Baltimore and Ohio Railroad. It served as a crucial freight line, transporting materials between Silver Spring and Georgetown. After rail services ceased in 1985, the disused railway was transformed into the Capital Crescent Trail, preserving its historical structure for recreational use.