USFS National Forest System Trails · Arapaho and Roosevelt National Forests · Colorado · Updated June 2026
D-3 (USFS trail 73) is a 1 mi trail in Arapaho and Roosevelt National Forests, Colorado. Mountain bikes are designated as allowed, Jun–Nov, with no Class 1 e-bike designation on record.
Can I bike D-3?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | Jun–Nov |
| 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
D-3 (USFS trail 73) is a 1 mi trail in Arapaho and Roosevelt National Forests, Colorado. The figures here are pulled from the official US Forest Service trail data for Arapaho and Roosevelt National Forests, covering the trail's mileage, tread, grade band, and the bike and e-bike uses the agency lists as designated. The tread is mapped as native material. Its grade-based difficulty is Easy (grade band +5-8%) — a gentle steepness profile derived from USFS slope data, not a technical mountain-bike rating. Bike use is designated as allowed, typically Jun–Nov. 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. 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 D-3?
- Yes. Mountain bikes are designated as allowed on D-3 in Arapaho and Roosevelt National Forests, typically Jun–Nov, per USFS data.
- Are e-bikes allowed on D-3?
- No e-bike class (1, 2 or 3) is designated on D-3 in the USFS data.
- How long is D-3?
- D-3 measures about 1 mi in total, summed across its mapped National Forest System segments.
- What is the surface of D-3?
- USFS data records the tread surface of D-3 as native material.
- How difficult is D-3?
- 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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