USFS National Forest System Trails · Fishlake National Forest · Utah · Updated June 2026
Neff'S Reservoir (USFS trail 4148) is a 2.9 mi trail in Fishlake National Forest, Utah. Mountain-bike use here is restricted in USFS data, with Class 1 e-bikes also designated.
Can I bike Neff'S Reservoir?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Restricted | — |
| 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 Fishlake National Forest, 2% of rideable trail miles are open to mountain bikes — a Bike Access Grade of F.
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About this trail
In Fishlake National Forest, Utah, Neff'S Reservoir (USFS trail 4148) covers 2.9 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. Based on slope, this is a Advanced trail (grade band 12-20%); that reflects steep gradient and is not the same as a technical MTB difficulty rating. Note that mountain-bike use here is restricted in USFS records — confirm with the ranger district before riding. The record additionally permits Class 1, Class 2, Class 3 e-bike use; 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 4 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 Fishlake National Forest.
Frequently asked questions
- Can you mountain bike on Neff'S Reservoir?
- Mountain-bike use on Neff'S Reservoir is restricted in USFS records, though Class 1 e-bike use is designated. Confirm current rules with the managing ranger district.
- Are e-bikes allowed on Neff'S Reservoir?
- Class 1, Class 2, Class 3 e-bikes are designated on Neff'S Reservoir in the USFS data.
- How long is Neff'S Reservoir?
- Neff'S Reservoir measures about 2.9 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Neff'S Reservoir?
- USFS data records the tread surface of Neff'S Reservoir as native material.
- How difficult is Neff'S Reservoir?
- 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 Fishlake National Forest (USFS trail geometry isn't mapped).
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