USFS National Forest System Trails · Arapaho and Roosevelt National Forests · Colorado · Updated June 2026
Miller Fork (USFS trail 997) is a 3.2 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 Miller Fork?
| 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, Miller Fork (USFS trail 997) covers 3.2 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. Underfoot, the trail is recorded as native material. Based on slope, this is a Easy trail (grade band +5-8%); that reflects gentle gradient and is not the same as a technical MTB difficulty 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 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. For day-of certainty on closures or seasonal orders, check directly with the ranger district, since this reflects the USFS data as of the latest refresh.
Frequently asked questions
- Can you mountain bike on Miller Fork?
- Yes. Mountain bikes are designated as allowed on Miller Fork in Arapaho and Roosevelt National Forests, year-round, per USFS data.
- Are e-bikes allowed on Miller Fork?
- No e-bike class (1, 2 or 3) is designated on Miller Fork in the USFS data.
- How long is Miller Fork?
- Miller Fork measures about 3.2 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Miller Fork?
- USFS data records the tread surface of Miller Fork as native material.
- How difficult is Miller Fork?
- Its grade-based difficulty is Easy (grade band +5-8%), 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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