USFS National Forest System Trails · Pike and San Isabel National Forests · Colorado · Updated June 2026
Middle Spring Nature (USFS trail 1840) is a 0.6 mi trail in Pike and San Isabel National Forests, Colorado. Mountain bikes are designated as allowed year-round, with no Class 1 e-bike designation on record.
Can I bike Middle Spring Nature?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | year-round |
| Class 1 e-bike (pedal-assist, 20 mph) | — | |
| Class 2 e-bike (throttle, 20 mph) | — | |
| Class 3 e-bike (pedal-assist, 28 mph) | — |
Zooming out: across Pike and San Isabel National Forests, 51% of rideable trail miles are open to mountain bikes — a Bike Access Grade of B.
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About this trail
Middle Spring Nature (USFS trail 1840) is a 0.6 mi trail in Pike and San Isabel National Forests, Colorado. The figures here are pulled from the official US Forest Service trail data for Pike and San Isabel National Forests, covering the trail's mileage, tread, grade band, and the bike and e-bike uses the agency lists as designated. Underfoot, the trail is recorded as imported compacted material. USFS slope data puts it in the Easy band (grade band +5-8%), meaning a gentle 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 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. 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 Middle Spring Nature?
- Yes. Mountain bikes are designated as allowed on Middle Spring Nature in Pike and San Isabel National Forests, year-round, per USFS data.
- Are e-bikes allowed on Middle Spring Nature?
- No e-bike class (1, 2 or 3) is designated on Middle Spring Nature in the USFS data.
- How long is Middle Spring Nature?
- Middle Spring Nature measures about 0.6 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Middle Spring Nature?
- USFS data records the tread surface of Middle Spring Nature as imported compacted material.
- How difficult is Middle Spring Nature?
- Its grade-based difficulty is Easy (grade band +5-8%), 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 Pike and San Isabel National Forests (USFS trail geometry isn't mapped).
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