USFS National Forest System Trails · Shasta-Trinity National Forest · California · Updated June 2026
Pyroclasm (USFS trail 04W54) is a 1.2 mi trail in Shasta-Trinity National Forest, California. Mountain bikes are designated as allowed year-round, with no Class 1 e-bike designation on record.
Can I bike Pyroclasm?
| 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 Shasta-Trinity National Forest, 77% of rideable trail miles are open to mountain bikes — a Bike Access Grade of A.
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About this trail
Pyroclasm (USFS trail 04W54) is a 1.2 mi trail in Shasta-Trinity National Forest, California. This profile summarizes what the official US Forest Service trail record says about riding it: how long the trail is, what it's built on, how steep the route grades out, and which forms of bike use the agency has designated. Underfoot, the trail is recorded as native material. No grade band is recorded, so a steepness-based difficulty isn't available for this trail. Mountain bikes are allowed, open year-round in the data. 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. 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 Pyroclasm?
- Yes. Mountain bikes are designated as allowed on Pyroclasm in Shasta-Trinity National Forest, year-round, per USFS data.
- Are e-bikes allowed on Pyroclasm?
- No e-bike class (1, 2 or 3) is designated on Pyroclasm in the USFS data.
- How long is Pyroclasm?
- Pyroclasm measures about 1.2 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Pyroclasm?
- USFS data records the tread surface of Pyroclasm as native material.
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 Shasta-Trinity National Forest (USFS trail geometry isn't mapped).
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