USFS National Forest System Trails · Arapaho and Roosevelt National Forests · Colorado · Updated June 2026
Sourdough (USFS trail 835) is a 14.6 mi trail in Arapaho and Roosevelt National Forests, Colorado. Mountain bikes are designated as allowed year-round, with no Class 1 e-bike designation on record.
Can I bike Sourdough?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | year-round |
| Class 1 e-bike (pedal-assist, 20 mph) | Restricted | — |
| Class 2 e-bike (throttle, 20 mph) | Restricted | — |
| Class 3 e-bike (pedal-assist, 28 mph) | Restricted | — |
Zooming out: across Arapaho and Roosevelt National Forests, 99% of rideable trail miles are open to mountain bikes — a Bike Access Grade of A.
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About this trail
In Arapaho and Roosevelt National Forests, Colorado, Sourdough (USFS trail 835) covers 14.6 mi of National Forest System trail. 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. The tread is mapped as native material. Based on slope, this is a Advanced trail (grade band +12-20%); that reflects steep gradient and is not the same as a technical MTB difficulty rating. Mountain bikes are allowed, open year-round 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 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. Treat this as a planning reference rather than a live conditions report, and verify any time-sensitive closure or order with the ranger district that manages Arapaho and Roosevelt National Forests.
Frequently asked questions
- Can you mountain bike on Sourdough?
- Yes. Mountain bikes are designated as allowed on Sourdough in Arapaho and Roosevelt National Forests, year-round, per USFS data.
- Are e-bikes allowed on Sourdough?
- No e-bike class (1, 2 or 3) is designated on Sourdough in the USFS data.
- How long is Sourdough?
- Sourdough measures about 14.6 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Sourdough?
- USFS data records the tread surface of Sourdough as native material.
- How difficult is Sourdough?
- 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 Arapaho and Roosevelt National Forests (USFS trail geometry isn't mapped).
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