USFS National Forest System Trails · Tongass National Forest · Alaska · Updated June 2026
Treadwell Ditch Trail (USFS trail 33718) is a 9.8 mi trail in Tongass National Forest, Alaska. Mountain-bike use here is accepted but discouraged in USFS data, with Class 1 e-bikes also designated.
Can I bike Treadwell Ditch Trail?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Accepted but discouraged | — |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | Jan–Apr, December |
| Class 2 e-bike (throttle, 20 mph) | Allowed | Jan–Apr, December |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | Jan–Apr, December |
Zooming out: across Tongass National Forest, 0% of rideable trail miles are open to mountain bikes — a Bike Access Grade of F.
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About this trail
In Tongass National Forest, Alaska, Treadwell Ditch Trail (USFS trail 33718) covers 9.8 mi of National Forest System trail. This profile summarizes what the official US Forest Service trail record says about riding it: how long the trail is, what it's built on, how steep the route grades out, and which forms of bike use the agency has designated. Underfoot, the trail is recorded as native material. Its grade-based difficulty is Easy (grade band +0-5%) — a gentle steepness profile derived from USFS slope data, not a technical mountain-bike rating. For traditional mountain bikes, use is discouraged according to USFS data. On the electric side, Class 1, Class 2, Class 3 e-bikes are also designated (Jan–Apr, December) — Class 1 being pedal-assist only, Classes 2 and 3 adding a throttle and higher assisted speed. The route is mapped as USFS Trail Class 3 on the agency's 1-to-5 development scale, where 1 is the most primitive, minimally maintained tread and 5 is the most developed. Because conditions, closures, and local orders change between data refreshes, confirm the current status with the managing ranger district before you ride.
Frequently asked questions
- Can you mountain bike on Treadwell Ditch Trail?
- Mountain-bike use on Treadwell Ditch Trail is discouraged in USFS records, though Class 1 e-bike use is designated. Confirm current rules with the managing ranger district.
- Are e-bikes allowed on Treadwell Ditch Trail?
- Class 1, Class 2, Class 3 e-bikes are designated on Treadwell Ditch Trail in the USFS data.
- How long is Treadwell Ditch Trail?
- Treadwell Ditch Trail measures about 9.8 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Treadwell Ditch Trail?
- USFS data records the tread surface of Treadwell Ditch Trail as native material.
- How difficult is Treadwell Ditch Trail?
- Its grade-based difficulty is Easy (grade band +0-5%), derived from USFS slope data. This reflects steepness, not technical mountain-bike difficulty.
How we read this data
Grade-based difficulty above is the USFS grade (route steepness), not a technical mountain-bike rating — a gentle-grade trail can still be rocky or technical, and vice versa. Bike and e-bike status come verbatim from the USFS managed-use fields for this trail; we never infer access we can't cite. See our methodology for how the dataset is built and what each field means.
Where it is
Approximate location of Tongass National Forest (USFS trail geometry isn't mapped).
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