USFS National Forest System Trails · Black Hills National Forest · South Dakota · Updated June 2026
Marys (USFS trail 54C) is a 0.6 mi trail in Black Hills National Forest, South Dakota. Mountain bikes are designated as allowed, Apr–Oct, with no Class 1 e-bike designation on record.
Can I bike Marys?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | Apr–Oct |
| 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
Marys (USFS trail 54C) is a 0.6 mi trail in Black Hills National Forest, 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. Based on slope, this is a Intermediate trail (grade band 10-12%); that reflects moderate gradient and is not the same as a technical MTB difficulty rating. Mountain bikes are allowed, with a Apr–Oct season in the data. No e-bike class (1, 2 or 3) is designated on this trail in the USFS data, so treat it as a non-motorized route unless a posted order says otherwise. 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 Marys?
- Yes. Mountain bikes are designated as allowed on Marys in Black Hills National Forest, typically Apr–Oct, per USFS data.
- Are e-bikes allowed on Marys?
- No e-bike class (1, 2 or 3) is designated on Marys in the USFS data.
- How long is Marys?
- Marys measures about 0.6 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Marys?
- USFS data records the tread surface of Marys as native material.
- How difficult is Marys?
- Its grade-based difficulty is Intermediate (grade band 10-12%), 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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