USFS National Forest System Trails · San Juan National Forest · Colorado · Updated June 2026
Cliff Line (USFS trail 147) is a 0.9 mi trail in San Juan National Forest, Colorado. Mountain bikes are designated as allowed, Apr–Nov, with no Class 1 e-bike designation on record.
Can I bike Cliff Line?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | Apr–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 San Juan National Forest, 29% of rideable trail miles are open to mountain bikes — a Bike Access Grade of C.
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About this trail
Cliff Line (USFS trail 147) runs 0.9 mi through San Juan National Forest 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. Underfoot, the trail is recorded as native material. USFS slope data puts it in the Intermediate band (grade band +8-10%), meaning a moderate climb — keep in mind this measures steepness, not trail technicality. Bike use is designated as allowed, typically Apr–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 Cliff Line?
- Yes. Mountain bikes are designated as allowed on Cliff Line in San Juan National Forest, typically Apr–Nov, per USFS data.
- Are e-bikes allowed on Cliff Line?
- No e-bike class (1, 2 or 3) is designated on Cliff Line in the USFS data.
- How long is Cliff Line?
- Cliff Line measures about 0.9 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Cliff Line?
- USFS data records the tread surface of Cliff Line as native material.
- How difficult is Cliff Line?
- Its grade-based difficulty is Intermediate (grade band +8-10%), 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 San Juan National Forest (USFS trail geometry isn't mapped).
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