USFS National Forest System Trails · Arapaho and Roosevelt National Forests · Colorado · Updated June 2026
West Stillwater (USFS trail 25.1) is a 8.2 mi trail in Arapaho and Roosevelt National Forests, Colorado. Mountain bikes are designated as allowed, Jun–Nov, with Class 1 e-bikes also designated.
Can I bike West Stillwater?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | Jun–Nov |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | Jun–Nov |
| Class 2 e-bike (throttle, 20 mph) | Allowed | Jun–Nov |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | Jun–Nov |
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
West Stillwater (USFS trail 25.1) runs 8.2 mi through Arapaho and Roosevelt National Forests in Colorado. 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. USFS records list its surface as native material. No grade band is recorded, so a steepness-based difficulty isn't available for this trail. Mountain bikes are allowed, with a Jun–Nov season in the data. The record additionally permits Class 1, Class 2, Class 3 e-bike use, Jun–Nov; recall that Class 1 is pedal-assist, while Class 2 adds a throttle and Class 3 a higher cutoff speed. Its USFS Trail Class (the agency's 1-to-5 development rating) isn't recorded for this segment. 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 West Stillwater?
- Yes. Mountain bikes are designated as allowed on West Stillwater in Arapaho and Roosevelt National Forests, typically Jun–Nov, per USFS data.
- Are e-bikes allowed on West Stillwater?
- Class 1, Class 2, Class 3 e-bikes are designated on West Stillwater in the USFS data.
- How long is West Stillwater?
- West Stillwater measures about 8.2 mi in total, summed across its mapped National Forest System segments.
- What is the surface of West Stillwater?
- USFS data records the tread surface of West Stillwater as native material.
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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