Starting from the trailhead on Skyline Boulevard, the trail is relatively level and rolling, with a slight downward slope between the short hills. Before long, it leaves the serene forest and begins to follow the powerlines.
At about a third of a mile in, Firelane 12
forks to the left. This trail is also bike-legal.
Continue straight, however, and a little over a mile from the start, the trail plummets into a very steep mile-long switchbacking descent. This is STEEP. It is not recommended for novice riders or those unsure of their brakes. But downhill riders wanting a quick thrill within city limits could probably have some fun here.
The trail terminates at the foot of the Tualatin Mountains, on the broad shoulder of Highway 30. There isn't a parking area and it's illegal to block the gate, so your ride will likely never start from the bottom. Prepare for the grueling climb back up BPA Road or head up Newton Road
for a less-steep-but-still-pretty-darn-steep climb.