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Routes
Mountain biking trails
United States
Alaska
Juneau City And Borough

Treadwell Ditch Trail

Moderate

5.0

(4975)

19,042

riders

Treadwell Ditch Trail

03:13

42.2km

580m

Mountain biking

Embark on the Treadwell Ditch Trail for a moderate mountain biking adventure spanning 26.2 miles (42.2 km), with an elevation gain of 1900 feet (579 metres). You can expect to complete this route in about 3 hours and 13 minutes. As you ride, you'll be immersed in a vibrant old-growth…

Last updated: April 23, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Tongass National Forest

Waypoints

A

Start point

Parking

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1

295 m

Treadwell Ditch Trail

Highlight (Segment) • Trail

This is a chill ride through temperate rainforest, with only minimal obstacles like boardwalks. You'll be sharing the trail with walkers and runners, but sometimes the views through the trees …

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B

42.2 km

End point

Parking

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Way Types & Surfaces

Way Types

41.5 km

485 m

145 m

< 100 m

Surfaces

41.5 km

485 m

145 m

< 100 m

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Elevation

Elevation

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Today

Thursday 7 May

8°C

2°C

0 %

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Max wind speed: 2.0 km/h

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This route was planned by komoot.

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Frequently Asked Questions

Where can I park to access the Treadwell Ditch Trail?

The trail connects Eaglecrest to Douglas, offering multiple access points. You can typically find parking at either end of the trail, near Eaglecrest or in Douglas. Specific parking areas are usually well-marked at these trailheads.

Is the Treadwell Ditch Trail dog-friendly?

Yes, dogs are permitted on the trail. Please ensure your dog is kept on a leash and that you clean up after them to maintain the trail's cleanliness for all users.

What is the best time of year to mountain bike the Treadwell Ditch Trail?

The trail is generally best ridden from late spring through early fall when snow has melted and conditions are drier. While some sections have good drainage, the trail is in an old-growth rainforest and can be wet. Riding in the rain is possible in some areas due to recent improvements.

Are there any permits or fees required to use the Treadwell Ditch Trail?

The Treadwell Ditch Trail is located within the Tongass National Forest. Generally, there are no specific permits or entrance fees required for day use of trails in this area. However, it's always a good idea to check the latest regulations from the US Forest Service for any updates before your visit.

How long does it typically take to mountain bike the Treadwell Ditch Trail?

The trail is approximately 42 kilometers (26 miles) long. Komoot estimates a mountain biking duration of around 3 hours and 13 minutes for the full route, but this can vary significantly based on your fitness level, skill, and how often you stop to enjoy the scenery.

Is the Treadwell Ditch Trail suitable for beginner mountain bikers?

While the trail is rated as 'moderate' overall, some sections are considered suitable for beginners, especially those that have been recently 'manicured' with gravel. However, other parts, particularly the northern section and the segment between Emerson junction and Bonnie Brae, are more technical and challenging, requiring advanced skills. Beginners should research specific sections before attempting the full trail.

What is the terrain like on the Treadwell Ditch Trail?

The terrain is diverse, featuring singletrack, flat and wide sections, technical rocky spots, tree roots, and numerous bridges. You'll encounter machine-built gravel sections, especially connecting Eaglecrest to the ditch, but also often wet conditions, mud, and stream crossings due to its old-growth rainforest setting. The northern end has very steep side slopes.

What kind of scenery can I expect along the trail?

You'll be immersed in a beautiful old-growth rainforest, characterized by large spruce trees and a 'sea of green.' The trail crosses many powerful, clear streams fed by rain and snowmelt, with numerous picturesque bridges. It also offers glimpses into Juneau's past through its connection to the historic Treadwell Gold Mine.

Are there any historical landmarks or notable features along the route?

Yes, the trail itself is a significant historical landmark. It follows the route of a 14-mile-long aqueduct system constructed between 1880 and 1888 to supply water to the historic Treadwell Gold Mine. The recent renovations, including 33 new bridges and 25 culverts, are also notable features of its ongoing legacy.

Does the Treadwell Ditch Trail intersect other well-known paths?

Yes, the route serves as a vital link to other trails on Douglas Island. It connects to paths such as the Dan Moller Trail and the Mount Jumbo Trail, allowing for extended adventures and varied routes.

Can I mountain bike the Treadwell Ditch Trail in wet weather?

Thanks to recent renovations and good drainage in certain areas, the trail can indeed be ridden in the rain. However, expect muddy conditions and be prepared for potentially slick surfaces, especially on roots and rocks, as it's situated in an old-growth rainforest.

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Moderate

1

Treadwell Ditch Trail

03:13h

42.2km

580m

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