5.0
(4975)
19,042
riders
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
Start point
Parking
Get Directions
295 m
Highlight (Segment) • Trail
Tip by
42.2 km
End point
Parking
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
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This route was planned by komoot.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.