USFS National Forest System Trails · Mt. Baker-Snoqualmie National Forest · Washington · Updated October 2026
Old Sauk (USFS trail 728) is a 3 mi trail in Mt. Baker-Snoqualmie National Forest, Washington. Mountain bikes are designated as allowed year-round, with no Class 1 e-bike designation on record.
- Trail length
- 3 mi
- Grade-based difficulty
- Advancedgrade band +12-20%
- Surface
- Native Material
- USFS trail class
- Class 31 primitive · 5 developed
Can I bike Old Sauk?
| 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 Mt. Baker-Snoqualmie National Forest, 74% of rideable trail miles are open to mountain bikes — a Bike Access Grade of A.
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About this trail
Old Sauk (USFS trail 728) is a 3 mi trail in Mt. Baker-Snoqualmie National Forest, Washington. 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. USFS slope data puts it in the Advanced band (grade band +12-20%), meaning a steep climb — keep in mind this measures steepness, not trail technicality. Bike use is designated as allowed year-round. 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. 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 Old Sauk?
- Yes. Mountain bikes are designated as allowed on Old Sauk in Mt. Baker-Snoqualmie National Forest, year-round, per USFS data.
- Are e-bikes allowed on Old Sauk?
- No e-bike class (1, 2 or 3) is designated on Old Sauk in the USFS data.
- How long is Old Sauk?
- Old Sauk measures about 3 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Old Sauk?
- USFS data records the tread surface of Old Sauk as native material.
- How difficult is Old Sauk?
- Its grade-based difficulty is Advanced (grade band +12-20%), 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 Mt. Baker-Snoqualmie National Forest (USFS trail geometry isn't mapped).
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