USFS National Forest System Trails · Black Hills National Forest · South Dakota · Updated June 2026
Centennial On Mystic (USFS trail 89-MY) is a 31 mi trail in Black Hills National Forest, South Dakota. Mountain bikes are designated as allowed year-round, with no Class 1 e-bike designation on record.
Can I bike Centennial On Mystic?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | year-round |
| Class 1 e-bike (pedal-assist, 20 mph) | — | |
| Class 2 e-bike (throttle, 20 mph) | — | |
| Class 3 e-bike (pedal-assist, 28 mph) | — |
Zooming out: across Black Hills National Forest, 34% of rideable trail miles are open to mountain bikes — a Bike Access Grade of C.
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About this trail
Centennial On Mystic (USFS trail 89-MY) runs 31 mi through Black Hills National Forest in South Dakota. Everything below comes straight from the US Forest Service National Forest System Trails dataset — length, surface, slope-derived difficulty, and the specific bike and e-bike designations on record — so you can check legality before you load up. Underfoot, the trail is recorded as native material. Its grade-based difficulty is Advanced (grade band 12-20%) — a steep steepness profile derived from USFS slope data, not a technical mountain-bike rating. Bike use is designated as allowed year-round. The agency lists no Class 1, 2 or 3 e-bike designation here; absent a local order to the contrary, that means e-bikes are not an allowed use on this trail. 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 Centennial On Mystic?
- Yes. Mountain bikes are designated as allowed on Centennial On Mystic in Black Hills National Forest, year-round, per USFS data.
- Are e-bikes allowed on Centennial On Mystic?
- No e-bike class (1, 2 or 3) is designated on Centennial On Mystic in the USFS data.
- How long is Centennial On Mystic?
- Centennial On Mystic measures about 31 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Centennial On Mystic?
- USFS data records the tread surface of Centennial On Mystic as native material.
- How difficult is Centennial On Mystic?
- Its grade-based difficulty is Advanced (grade band 12-20%), 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 Black Hills National Forest (USFS trail geometry isn't mapped).
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