USFS National Forest System Trails · Siuslaw National Forest · Oregon · Updated June 2026
Three Mile Lake South (USFS trail 1356) is a 1 mi trail in Siuslaw National Forest, Oregon. Mountain bikes are designated as allowed year-round, with no Class 1 e-bike designation on record.
Can I bike Three Mile Lake South?
| 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 Siuslaw National Forest, 27% of rideable trail miles are open to mountain bikes — a Bike Access Grade of C.
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About this trail
Three Mile Lake South (USFS trail 1356) is a 1 mi trail in Siuslaw National Forest, Oregon. 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. Based on slope, this is a Easy trail (grade band 0-5%); that reflects gentle gradient and is not the same as a technical MTB difficulty rating. 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 Three Mile Lake South?
- Yes. Mountain bikes are designated as allowed on Three Mile Lake South in Siuslaw National Forest, year-round, per USFS data.
- Are e-bikes allowed on Three Mile Lake South?
- No e-bike class (1, 2 or 3) is designated on Three Mile Lake South in the USFS data.
- How long is Three Mile Lake South?
- Three Mile Lake South measures about 1 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Three Mile Lake South?
- USFS data records the tread surface of Three Mile Lake South as native material.
- How difficult is Three Mile Lake South?
- Its grade-based difficulty is Easy (grade band 0-5%), 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 Siuslaw National Forest (USFS trail geometry isn't mapped).
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