Getting to and walking on to Devil's Bridge were two completely different experiences for me. I'll start with the latter.
The hike up to Devil's Bridge was pretty easy for me (perhaps moderate for those who are not comfortable walking on/around uneven terrain and rocks). Unfortunately because I was so focused on looking down at where I was stepping, I completely missed the rock "point" (not cairn) that directs you to the left onto the bridge. So I ended up walking about 10 minutes up some path that I eventually figured out was wrong. Oops. At least I got a little extra exercise. I made my way back and found the bridge. The bridge itself is pretty cool. You wonder how something that has no middle support can be sturdy but it is. Looking out at the rocks and even down from the bridge are photo-worthy. If you're at the end of the bridge and look down to the right, you'll see a "platform" on which people can stand to look up to you. This stop can be made before/after you go the bridge. I decided to stop there afterwards since it was on my way back. Again, great views of the bridge from a lower angle.
Now getting to Devil's Bridge was another story. Driving down Dry Creek Road, I thought I'd see a nice big sign saying "turn right" or "Devil's Bridge this way". Nope. I first ended up driving on Lost Canyon Road to Seven Corners where a nice man told me that I had gone too far. He instructed me on where to turn. I backtracked and found my way to the frontage road that took me to the parking lot. This is where I had to make a decision: park in the lot or take my rented Chevy Captiva SUV down the road. So I drove the mile or so past a few hikers all the way to the small parking area where you can drive no more. Even though I had the comforts of a radio and AC, this is an extremely bumpy, rocky road to drive on... even with an SUV. I didn't keep track of it on my way to the bridge, but on the way back it probably took me about 20 minutes to drive 5mph back up that road. I was fortunate that I didn't get stuck in a rut, that the tires didn't blow and that I didn't severely damage the underbody of the vehicle (at least, I don't think I did). If you decide to drive down this road, you definitely want a 4x4 high clearance vehicle (as listed on the sign right at the start of the road). If you decide to walk down this road, have really good hiking shoes, bring lots of water and allow time for the extra 2+ miles.
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