A famous Alaskan road, due to its gravel length being no-mans-land for most Alaskan car rental companies.
The gravel section starts in the town of Chitina and runs across a series of rivers (Copper, Kuskulana, Gilahina, etc.), following the old Copper River and Northwestern Railway grade (completed in 1911 to service the mining town of Kennecott). It ends at the footbridge that leads across the Kennicott River to McCarthy proper.
Since it's an old railroad bed, there's very little in the way of steep sections, just a 59 mile, mostly flat, potholed, dusty, Alaskan road.