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Lift-served bike park · Southeast
Thunder Mountain Bike Park & Dredge Lakes
Juneau's new progressive bike park in the Mendenhall Valley, plus flat glacial-gravel loops at Dredge Lakes.
- Trail type
- Progressive bike park trails (signed difficulty) plus Dredge Lakes' gravel loops
- Difficulty
- Signed green, blue and black. Dredge Lakes is easy
- Land managers
- City and Borough of Juneau (bike park); Tongass NF (Dredge Lakes)
- Season
- Summer. Southeast rain makes everything wet
- Builders
- JMBA and Trail Mix with CBJ
Overview
CBJ built Thunder Mountain Bike Park with the Juneau Mountain Bike Alliance and Trail Mix: progressive trails with signed difficulty. The Tongass NF's Dredge Lake Loop nearby is firm glacial gravel, mostly level, and listed for mountain biking. Sections flood in heavy rain.
Rules and closures
Land manager: City and Borough of Juneau; USDA Forest Service, Tongass NF (City and Borough of Juneau: Thunder Mountain Bike Park).
- Helmets required in the bike park.
- No uphill traffic except on the Uptrack.
- No motorized vehicles, including electric motorcycles.
Season and winter fat biking
Summer. Southeast rain makes everything wet.
No winter grooming for bikes.
Winter riding near avalanche terrain: check our avalanche conditions page first.
Bears
This manager's page has no bear notice of its own, but all of Alaska is bear country. Ride in a group, make noise on blind corners, carry bear spray where you can reach it, and slow down near salmon streams.
Source: ADF&G: The essentials for traveling in bear country (statewide guidance)
Parking and trailheads
- Bike park: trailhead at the end of Jennifer Dr. Park at the Miller Ballfields.
- Dredge Lakes: Dredge Lake Rd trailhead (OpenStreetMap point).
Gear
Carry bear spray where you can reach it, a pump and tube, and layers for rain.
Our lists: Gear kits · Small-shop skis & splitboards · Alaska shops
Map: trailheads and parking
Points come from the sources listed. Basemap: USGS The National Map. Don't navigate with this map. Use the official trail map.