USFS National Forest System Trails · Caribou-Targhee National Forest · Idaho · Updated June 2026
South Fork Eightmile (USFS trail 1022) is a 3.2 mi trail in Caribou-Targhee National Forest, Idaho. Mountain bikes are designated as allowed year-round, with Class 1 e-bikes also designated.
Can I bike South Fork Eightmile?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | year-round |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | year-round |
| Class 2 e-bike (throttle, 20 mph) | Allowed | year-round |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | year-round |
Zooming out: across Caribou-Targhee National Forest, 98% of rideable trail miles are open to mountain bikes — a Bike Access Grade of A.
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About this trail
In Caribou-Targhee National Forest, Idaho, South Fork Eightmile (USFS trail 1022) covers 3.2 mi of National Forest System trail. The figures here are pulled from the official US Forest Service trail data for Caribou-Targhee 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. Based on slope, this is a Expert trail (grade band +20-30%); that reflects very steep gradient and is not the same as a technical MTB difficulty rating. Mountain bikes are allowed, open year-round in the data. On the electric side, Class 1, Class 2, Class 3 e-bikes are also designated — Class 1 being pedal-assist only, Classes 2 and 3 adding a throttle and higher assisted 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. 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 South Fork Eightmile?
- Yes. Mountain bikes are designated as allowed on South Fork Eightmile in Caribou-Targhee National Forest, year-round, per USFS data.
- Are e-bikes allowed on South Fork Eightmile?
- Class 1, Class 2, Class 3 e-bikes are designated on South Fork Eightmile in the USFS data.
- How long is South Fork Eightmile?
- South Fork Eightmile measures about 3.2 mi in total, summed across its mapped National Forest System segments.
- What is the surface of South Fork Eightmile?
- USFS data records the tread surface of South Fork Eightmile as native material.
- How difficult is South Fork Eightmile?
- Its grade-based difficulty is Expert (grade band +20-30%), 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 Caribou-Targhee National Forest (USFS trail geometry isn't mapped).
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