Alaska Highway Backcountry Diversions

Built in eight months during World War II, the Alaska Highway’s original route included dozens of construction camps and bypasses that are now forgotten backcountry trails. The main diversions branch off near Fort Nelson and Muncho Lake, following old Cat train routes through muskeg, creek crossings, and abandoned bridge sites. Mile 392’s old bypass still has concrete piers from the original bridge construction, and the Prophet River detour takes you past rusted bulldozers left behind by American engineers in 1942.

Moderate difficulty with several creek crossings that can swell after rain—high clearance essential, 4WD recommended for the muddier sections. Summer through early fall gives best access, though expect bugs and sudden weather changes. No permits needed, but fuel up in Fort Nelson and carry recovery gear for the soft sections. You’re driving through one of the most ambitious engineering projects in military history, surrounded by wilderness that looks exactly as it did when those GIs first punched through.