USFS National Forest System Trails · White River National Forest · Colorado · Updated June 2026
Great Flume (USFS trail GH-92) is a 4 mi trail in White River National Forest, Colorado. Mountain bikes are designated as allowed, May–Nov, with no Class 1 e-bike designation on record.
Can I bike Great Flume?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | May–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 White River National Forest, 99% of rideable trail miles are open to mountain bikes — a Bike Access Grade of A.
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About this trail
In White River National Forest, Colorado, Great Flume (USFS trail GH-92) covers 4 mi of National Forest System trail. 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. USFS records list its surface as native material. No grade band is recorded, so a steepness-based difficulty isn't available for this trail. Mountain bikes are allowed, with a May–Nov season in the data. 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 Great Flume?
- Yes. Mountain bikes are designated as allowed on Great Flume in White River National Forest, typically May–Nov, per USFS data.
- Are e-bikes allowed on Great Flume?
- No e-bike class (1, 2 or 3) is designated on Great Flume in the USFS data.
- How long is Great Flume?
- Great Flume measures about 4 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Great Flume?
- USFS data records the tread surface of Great Flume 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 White River National Forest (USFS trail geometry isn't mapped).
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