USFS National Forest System Trails · Tongass National Forest · Alaska · Updated June 2026
Twin Mountain Northwest Slope (USFS trail 542050750) is a 1.6 mi trail in Tongass National Forest, Alaska. Mountain-bike use here is accepted but discouraged in USFS data, with Class 1 e-bikes also designated.
Can I bike Twin Mountain Northwest Slope?
| 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 Tongass National Forest, 0% of rideable trail miles are open to mountain bikes — a Bike Access Grade of F.
Watch Tongass National Forest for access changes
Email me when USFS mountain-bike or e-bike designations change for trails in Tongass National Forest. Free, unsubscribe anytime.
About this trail
Twin Mountain Northwest Slope (USFS trail 542050750) runs 1.6 mi through Tongass National Forest in Alaska. 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. USFS records list its surface as imported loose material. USFS slope data puts it in the Advanced band (grade band +12-20%), meaning a steep climb — keep in mind this measures steepness, not trail technicality. Note that mountain-bike use here is discouraged 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 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 Tongass National Forest.
Frequently asked questions
- Can you mountain bike on Twin Mountain Northwest Slope?
- Mountain-bike use on Twin Mountain Northwest Slope 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 Twin Mountain Northwest Slope?
- Class 1, Class 2, Class 3 e-bikes are designated on Twin Mountain Northwest Slope in the USFS data.
- How long is Twin Mountain Northwest Slope?
- Twin Mountain Northwest Slope measures about 1.6 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Twin Mountain Northwest Slope?
- USFS data records the tread surface of Twin Mountain Northwest Slope as imported loose material.
- How difficult is Twin Mountain Northwest Slope?
- 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 Tongass National Forest (USFS trail geometry isn't mapped).
Where to stay near Tongass National Forest
Find hotels, cabins, and vacation rentals near Tongass National Forest — plan your ride.
Top-rated places to stay near Tongass National Forest
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Riding Tongass National Forest?
Trail-access updates and trip ideas by email.