USFS National Forest System Trails · Ottawa National Forest · Michigan · Updated June 2026
Nfst-4581 (USFS trail T4581) is a 1.2 mi trail in Ottawa National Forest, Michigan. Mountain-bike use here is accepted but discouraged in USFS data, with Class 1 e-bikes also designated.
Can I bike Nfst-4581?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Accepted but discouraged | — |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | Jan–Mar, May–Dec |
| Class 2 e-bike (throttle, 20 mph) | Allowed | Jan–Mar, May–Dec |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | Jan–Mar, May–Dec |
Zooming out: across Ottawa National Forest, 8% of rideable trail miles are open to mountain bikes — a Bike Access Grade of F.
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About this trail
Nfst-4581 (USFS trail T4581) is a 1.2 mi trail in Ottawa National Forest, Michigan. 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. The tread is mapped as native material. USFS slope data puts it in the Easy band (grade band 0-5%), meaning a gentle climb — keep in mind this measures steepness, not trail technicality. For traditional mountain bikes, use is discouraged according to USFS data. The record additionally permits Class 1, Class 2, Class 3 e-bike use, Jan–Mar, May–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 Ottawa National Forest.
Frequently asked questions
- Can you mountain bike on Nfst-4581?
- Mountain-bike use on Nfst-4581 is discouraged in USFS records, though Class 1 e-bike use is designated. Confirm current rules with the managing ranger district.
- Are e-bikes allowed on Nfst-4581?
- Class 1, Class 2, Class 3 e-bikes are designated on Nfst-4581 in the USFS data.
- How long is Nfst-4581?
- Nfst-4581 measures about 1.2 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Nfst-4581?
- USFS data records the tread surface of Nfst-4581 as native material.
- How difficult is Nfst-4581?
- 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 Ottawa National Forest (USFS trail geometry isn't mapped).
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