USFS National Forest System Trails · Stanislaus National Forest · California · Updated June 2026
S Fork Mokelumne (USFS trail 15E12) is a 4.1 mi trail in Stanislaus National Forest, California. Mountain bikes are designated as allowed year-round, with no Class 1 e-bike designation on record.
Can I bike S Fork Mokelumne?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | year-round |
| Class 1 e-bike (pedal-assist, 20 mph) | — | |
| Class 2 e-bike (throttle, 20 mph) | — | |
| Class 3 e-bike (pedal-assist, 28 mph) | — |
Zooming out: across Stanislaus National Forest, 84% of rideable trail miles are open to mountain bikes — a Bike Access Grade of A.
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About this trail
S Fork Mokelumne (USFS trail 15E12) is a 4.1 mi trail in Stanislaus National Forest, California. The figures here are pulled from the official US Forest Service trail data for Stanislaus National Forest, covering the trail's mileage, tread, grade band, and the bike and e-bike uses the agency lists as designated. Underfoot, the trail is recorded as native material. Its grade-based difficulty is Advanced (grade band +12-20%) — a steep steepness profile derived from USFS slope data, not a technical mountain-bike 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 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 S Fork Mokelumne?
- Yes. Mountain bikes are designated as allowed on S Fork Mokelumne in Stanislaus National Forest, year-round, per USFS data.
- Are e-bikes allowed on S Fork Mokelumne?
- No e-bike class (1, 2 or 3) is designated on S Fork Mokelumne in the USFS data.
- How long is S Fork Mokelumne?
- S Fork Mokelumne measures about 4.1 mi in total, summed across its mapped National Forest System segments.
- What is the surface of S Fork Mokelumne?
- USFS data records the tread surface of S Fork Mokelumne as native material.
- How difficult is S Fork Mokelumne?
- Its grade-based difficulty is Advanced (grade band +12-20%), 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 Stanislaus National Forest (USFS trail geometry isn't mapped).
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