USFS National Forest System Trails · Eldorado National Forest · California · Updated June 2026
Big X Atv (USFS trail 12E19) is a 3.7 mi trail in Eldorado National Forest, California. Mountain-bike use here is not designated in USFS data, with Class 1 e-bikes also designated.
Can I bike Big X Atv?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | — | |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | Apr–Dec |
| Class 2 e-bike (throttle, 20 mph) | Allowed | Apr–Dec |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | Apr–Dec |
Zooming out: across Eldorado National Forest, 94% of rideable trail miles are open to mountain bikes — a Bike Access Grade of A.
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About this trail
Big X Atv (USFS trail 12E19) is a 3.7 mi trail in Eldorado National Forest, California. 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 Intermediate trail (grade band 10-12%); that reflects moderate gradient and is not the same as a technical MTB difficulty rating. Note that mountain-bike use here is not designated in USFS records — confirm with the ranger district before riding. The record additionally permits Class 1, Class 2, Class 3 e-bike use, Apr–Dec; recall that Class 1 is pedal-assist, while Class 2 adds a throttle and Class 3 a higher cutoff speed. 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. Because conditions, closures, and local orders change between data refreshes, confirm the current status with the managing ranger district before you ride.
Frequently asked questions
- Can you mountain bike on Big X Atv?
- Mountain-bike use on Big X Atv is not designated in USFS records, though Class 1 e-bike use is designated. Confirm current rules with the managing ranger district.
- Are e-bikes allowed on Big X Atv?
- Class 1, Class 2, Class 3 e-bikes are designated on Big X Atv in the USFS data.
- How long is Big X Atv?
- Big X Atv measures about 3.7 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Big X Atv?
- USFS data records the tread surface of Big X Atv as native material.
- How difficult is Big X Atv?
- Its grade-based difficulty is Intermediate (grade band 10-12%), 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 Eldorado National Forest (USFS trail geometry isn't mapped).
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