USFS National Forest System Trails · Huron-Manistee National Forest · Michigan · Updated June 2026
Grass Lake Spur (USFS trail H9-13) is a 1 mi trail in Huron-Manistee National Forest, Michigan. Mountain-bike use here is accepted but discouraged in USFS data, with Class 1 e-bikes also designated.
Can I bike Grass Lake Spur?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Accepted but discouraged | — |
| 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 Huron-Manistee National Forest, 10% of rideable trail miles are open to mountain bikes — a Bike Access Grade of F.
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About this trail
In Huron-Manistee National Forest, Michigan, Grass Lake Spur (USFS trail H9-13) covers 1 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. Underfoot, the trail is recorded as native material. Its grade-based difficulty is Easy (grade band 0-5%) — a gentle steepness profile derived from USFS slope data, not a technical mountain-bike rating. For traditional mountain bikes, use is discouraged according to USFS 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. 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 Huron-Manistee National Forest.
Frequently asked questions
- Can you mountain bike on Grass Lake Spur?
- Mountain-bike use on Grass Lake Spur 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 Grass Lake Spur?
- Class 1, Class 2, Class 3 e-bikes are designated on Grass Lake Spur in the USFS data.
- How long is Grass Lake Spur?
- Grass Lake Spur measures about 1 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Grass Lake Spur?
- USFS data records the tread surface of Grass Lake Spur as native material.
- How difficult is Grass Lake Spur?
- 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 Huron-Manistee National Forest (USFS trail geometry isn't mapped).
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