USFS National Forest System Trails · Arapaho and Roosevelt National Forests · Colorado · Updated June 2026
Middle Supply (USFS trail 123) is a 2.4 mi trail in Arapaho and Roosevelt National Forests, Colorado. Mountain bikes are designated as allowed, Jun–Nov, with Class 1 e-bikes also designated.
Can I bike Middle Supply?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Allowed | Jun–Nov |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | Jun–Nov |
| Class 2 e-bike (throttle, 20 mph) | Allowed | Jun–Nov |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | Jun–Nov |
Zooming out: across Arapaho and Roosevelt National Forests, 99% of rideable trail miles are open to mountain bikes — a Bike Access Grade of A.
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About this trail
In Arapaho and Roosevelt National Forests, Colorado, Middle Supply (USFS trail 123) covers 2.4 mi of National Forest System trail. The figures here are pulled from the official US Forest Service trail data for Arapaho and Roosevelt National Forests, covering the trail's mileage, tread, grade band, and the bike and e-bike uses the agency lists as designated. 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. Mountain bikes are allowed, with a Jun–Nov season in the data. The record additionally permits Class 1, Class 2, Class 3 e-bike use, Jun–Nov; 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 Arapaho and Roosevelt National Forests.
Frequently asked questions
- Can you mountain bike on Middle Supply?
- Yes. Mountain bikes are designated as allowed on Middle Supply in Arapaho and Roosevelt National Forests, typically Jun–Nov, per USFS data.
- Are e-bikes allowed on Middle Supply?
- Class 1, Class 2, Class 3 e-bikes are designated on Middle Supply in the USFS data.
- How long is Middle Supply?
- Middle Supply measures about 2.4 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Middle Supply?
- USFS data records the tread surface of Middle Supply as native material.
- How difficult is Middle Supply?
- 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 Arapaho and Roosevelt National Forests (USFS trail geometry isn't mapped).
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