USFS National Forest System Trails · Rogue River-Siskiyou National Forests · Oregon · Updated June 2026
Illinois River (USFS trail 1161) is a 27.4 mi trail in Rogue River-Siskiyou National Forests, Oregon. Mountain bikes are designated as allowed year-round, with Class 1 e-bikes also designated.
Can I bike Illinois River?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | year-round |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | Aug–Dec |
| Class 2 e-bike (throttle, 20 mph) | Allowed | Aug–Dec |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | Aug–Dec |
Zooming out: across Rogue River-Siskiyou National Forests, 53% of rideable trail miles are open to mountain bikes — a Bike Access Grade of B.
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About this trail
In Rogue River-Siskiyou National Forests, Oregon, Illinois River (USFS trail 1161) covers 27.4 mi of National Forest System trail. 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. 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, open year-round in the data. The record additionally permits Class 1, Class 2, Class 3 e-bike use, Aug–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. Treat this as a planning reference rather than a live conditions report, and verify any time-sensitive closure or order with the ranger district that manages Rogue River-Siskiyou National Forests.
Frequently asked questions
- Can you mountain bike on Illinois River?
- Yes. Mountain bikes are designated as allowed on Illinois River in Rogue River-Siskiyou National Forests, year-round, per USFS data.
- Are e-bikes allowed on Illinois River?
- Class 1, Class 2, Class 3 e-bikes are designated on Illinois River in the USFS data.
- How long is Illinois River?
- Illinois River measures about 27.4 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Illinois River?
- USFS data records the tread surface of Illinois River 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 Rogue River-Siskiyou National Forests (USFS trail geometry isn't mapped).
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