Tunnels, Trestles, and the Impossible Railroad

Bike ride by the Impossible Railroad through tunnels and to a trestle in San Diego

You’re going to need a headlamp for this bike ride. Take a 15-mile out-and-back Wild West revival ride along the “Impossible” Railroad, an engineering feat that extended from San Diego, California, to Yuma, Arizona. Starting in Jacumba’s Carrizo Gorge, pedal parallel to the railroad track and through seven tunnels—the longest of which is half a mile! The railroad is no longer in use, but there are still plenty of remnants. Look for two abandoned railcars along the way, and more wooden trestle bridges than you’ll care to go over (most cyclists dismount and wheel their bikes next to them during these short sections). You might even spy the bighorn sheep that call the Carrizo Gorge home, bounding up the boulder-strewn hillsides. Eventually you’ll see the Goat Trestle Bridge, built in 1932 following an earthquake that collapsed one of the tunnels along the route. This is the end of your ride. Marvel at the architecture of the historic bridge, walk your bike over it, or enjoy a snack here. Skilled bikers often ride across it. Return the way you came, careful to avoid the cholla cactus that skirts the trail.

BONUS BIZARRE EATS: If you’re feeling particularly adventurous, stop at the Shell gas station across from the parking lot at the end of your ride, where fried crickets and mealworms are on the menu for those with daring tastebuds!

From San Diego, take I-8 east approximately 70 miles to Exit 73 toward Jacumba. Turn right on Carrizo Gorge Road and park in the large dirt lot on your right. You’ll start your ride here. Follow the road roughly one mile until you see the sign for the De Anza Springs Resort. Turn left before the entrance and follow a short, narrow path to the railroad. Turn right onto the railroad and follow for approximately 7.5 miles to the Goat Trestle Bridge. Bring lots of headlamps/flashlights for the dark tunnels. NOTE: Spring temperatures are pleasant, but it can get dangerously hot in the summer, so it’s not recommended to do this bike ride then. Always bring more than enough drinking water and some snacks. Dogs allowed, but not advisable due to the cactus on the trailside and the potential for overheating.

Trending Stories NorCal

View all Stories
  1. Sequoia Re-opens Crystal Cave

    Step inside Sequoia & Kings Canyon National Park's hidden world by visiting the newly re-opened Crystal Cave—the only cave in the parks open to the public. Closed for four years, this rare marble karst cavern is welcoming visitors once again, but only through the summer season!

    View
  2. Afternoon on the Island

    What is it about tiny islands in the middle of lakes? There’s something that just draws you in. It’s even more fun when getting there is half the adventure because you have to reach it by canoe, kayak, paddleboat, or a ranger-guided boat tour!

    View
  3. Easiest Best Hike in the World

    Choose the easiest and most view-rewarding hike in Yosemite. Okay, we’ll go first: the combination of hiking to Sentinel Dome and Taft Point. Both of these lookouts are within a couple miles of each other on Glacier Point Road

    View
  4. Hiker in the forest at Mount Sutro in San Francisco

    San Francisco's Middle Earth

    No need to travel to New Zealand to visit Middle Earth. San Francisco’s Mount Sutro Open Space is practically Hobbiton—a hidden “shire” in the middle of the city. Okay, maybe not quite as magical, but still an incredible place to take a hike in city limits.

    View

Trending Stories SoCal

View all Stories
  1. Locals' Feature: Jim Litchfield, Owner of Reno Fly Shop

    If there's a river, you're likely to find Jim Litchfield there. As the owner of Reno Fly Shop, Nevada's premier fly fishing outfitter and shop, Jim's passion for rivers knows no bounds: he's fished in places near and far, including Alaska, Bolivia and Christmas Island. But home is beautiful Reno, where he has been running Reno Fly Shop and leading tailored river float and fly fishing adventures (including beginner-friendly options) for over a decade.

    View
  2. Can't Top This

    San Francisco’s Presidio was already a fantastic place to hang out for the afternoon, a beautiful site within the largest urban national park in the United States (the Golden Gate National Recreation Area). And Presidio Tunnel Tops is like a cherry on top. Make that two cherries on top, with the newly opened (July 2025) Outpost Meadow, a 1.5-acre green space located at Old Mason Street across from the Crissy Field Marsh in the Presidio.

    View
  3. Volcanic Activity

    Northern California is home to one of the most unique ecosystems in the country: Lassen Volcanic National Park. The region features geothermal areas, including the largest dome volcano in the world, Lassen Peak. Hike to the top of this active volcano on a 5-mile out-and-back.  

    View
  4. Oh Ryan

    Sure, it’s those whimsical trees that give Joshua Tree National Park its marquee billing; but this beautiful landscape also has surrounding mountains and its night sky—one of the darkest in Southern California and designated an International Dark Sky Park. Joshua Tree has four allowable stargazing parking lots, and a newly opened haven for spending the night nearby...

    View