A Sunday-Night Descent: Inside Portland’s Zoobomb
On any given Sunday night in Portland, a casual observer on the MAX light rail might notice a peculiar sight: riders on child-sized bikes, some with dragster-length forks or mismatched wheels, boarding the train with a purpose that seems at odds with their playful vehicles. The destination is the Washington Park/Zoo station, 260 feet below the West Hills, for what locals simply call a "Zoobomb."
The ritual begins at "the Pile," a bike rack near downtown that has been repurposed into a sculpture of roughly 20 kid-sized bicycles lashed together. Riders gather from the neighboring pizza joint, arriving on everything from BMX bikes to tandems and skateboards. The crowd is a mix of punks, students, and the occasional fortysomething in business attire, but the energy is uniform: a shared love for unconventional cycling and the night ahead. A volunteer with a clipboard handles sign-ups and distributes emergency kits to those with medical training, while others make last-minute repairs or trade stories from previous rides.
Once the group is assembled, the swarm moves as one: a two-block-long column of cyclists that flows through city streets, splitting for traffic and pooling together at the train platform. When the doors open, a hundred riders and bikes pack into the light rail car with surprising courtesy, holding grease-laden tires away from fellow commuters. The train carves through the tunnel under the hills, and at the Zoo station, the scene repeats—this time with twenty-odd bikes crammed into the elevators for the ride to the surface.
The First Descent
At the top of the hill, there is a brief lull. Riders talk in loose circles until the call goes out: "FIVE MINUTES!" A quick primer covers the basics—how to signal traffic, announce a pass, and the general route. The final instruction is simple: "If you get lost, just head downhill."
The countdown begins. At "Zoobomb!" the pack launches. Wind rushes past as the road becomes a ribbon of gray asphalt under a flood of bike lights. Riders shout warnings—"Car!"—as vehicles appear, and the group parts and rejoins around them like water around stone. The descent ends at a halfway point, a cemetery drive where riders catch their breath. The banter is quick: a legally blind rider on a tandem credits his partner for steering, insisting that two pedaling on one frame is unbeatable.
The second half of the run is rougher. The path narrows, degrades into broken asphalt, and winds through woods before spilling back onto downtown streets. Riders manage intersections by shouting "Clear!" or "Car!" and some time their start from the red light to hit every green. The ride concludes at PGE Park, clocking in at roughly fourteen minutes—a compressed surge of adrenaline followed by the collective decision to do it all over again.
Hellway
The second run is steeper. Hellway—the local name for a stretch of Highway 26—starts right from the elevator exit. The group crosses the parking lot, takes the on-ramp, and merges into the freeway's right lane, pedaling hard to hit forty miles an hour. The lane's margins are littered with glass, gravel, and metal debris, so the pack owns the asphalt. A few cars pass in the left lane, giving a wide berth. The route follows the off-ramp into a tunnel under the West Hills, where fifty bikes race beneath sodium lamps and arched tile, bursting out into the open air and coasting under the Vista Bridge before the train ride back.
Fourteen minutes of the first descent, a freeway run for the encore: Zoobomb is not a race so much as a shared expression of what happens when you take every kind of bike imaginable, ride into the hills at night, and let gravity do the rest.
