USFS National Forest System Trails · Mark Twain National Forest · Missouri · Updated June 2026
Chadwick 121 (USFS trail 21-121) is a 1.5 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 121?
| 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 121 (USFS trail 21-121) covers 1.5 mi of National Forest System trail. The figures here are pulled from the official US Forest Service trail data for Mark Twain National Forest, covering the trail's mileage, tread, grade band, and the bike and e-bike uses the agency lists as designated. USFS records list its surface as native material. Based on slope, this is a Intermediate trail (grade band +8-10%); that reflects moderate gradient and is not the same as a technical MTB difficulty rating. Bike use is designated as allowed year-round. On the electric side, Class 1, Class 2, Class 3 e-bikes are also designated — 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 Chadwick 121?
- Yes. Mountain bikes are designated as allowed on Chadwick 121 in Mark Twain National Forest, year-round, per USFS data.
- Are e-bikes allowed on Chadwick 121?
- Class 1, Class 2, Class 3 e-bikes are designated on Chadwick 121 in the USFS data.
- How long is Chadwick 121?
- Chadwick 121 measures about 1.5 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Chadwick 121?
- USFS data records the tread surface of Chadwick 121 as native material.
- How difficult is Chadwick 121?
- Its grade-based difficulty is Intermediate (grade band +8-10%), 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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