USFS National Forest System Trails · Mark Twain National Forest · Missouri · Updated June 2026
Chadwick 138 (USFS trail 21-138) is a 0.8 mi trail in Mark Twain National Forest, Missouri. Mountain bikes are designated as allowed year-round, with Class 1 e-bikes also designated.
Can I bike Chadwick 138?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | year-round |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | year-round |
| Class 2 e-bike (throttle, 20 mph) | Allowed | year-round |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | year-round |
Zooming out: across Mark Twain National Forest, 100% of rideable trail miles are open to mountain bikes — a Bike Access Grade of A.
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About this trail
In Mark Twain National Forest, Missouri, Chadwick 138 (USFS trail 21-138) covers 0.8 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. The tread is mapped as native material. Based on slope, this is a Expert trail (grade band +20-30%); that reflects very steep gradient and is not the same as a technical MTB difficulty rating. Mountain bikes are allowed, open year-round in the data. The record additionally permits Class 1, Class 2, Class 3 e-bike use; recall that Class 1 is pedal-assist, while Class 2 adds a throttle and Class 3 a higher cutoff speed. The route is mapped as USFS Trail Class 2 on the agency's 1-to-5 development scale, where 1 is the most primitive, minimally maintained tread and 5 is the most developed. For day-of certainty on closures or seasonal orders, check directly with the ranger district, since this reflects the USFS data as of the latest refresh.
Frequently asked questions
- Can you mountain bike on Chadwick 138?
- Yes. Mountain bikes are designated as allowed on Chadwick 138 in Mark Twain National Forest, year-round, per USFS data.
- Are e-bikes allowed on Chadwick 138?
- Class 1, Class 2, Class 3 e-bikes are designated on Chadwick 138 in the USFS data.
- How long is Chadwick 138?
- Chadwick 138 measures about 0.8 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Chadwick 138?
- USFS data records the tread surface of Chadwick 138 as native material.
- How difficult is Chadwick 138?
- Its grade-based difficulty is Expert (grade band +20-30%), 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 Mark Twain National Forest (USFS trail geometry isn't mapped).
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