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Road Trip pic of the day, 7/16: What and where?

This bridge is a relic, but once upon a time it was important to a lot of people. If you are the first to tell me what it's called, and where it's located, you'll win a prize.

Know what this bridge is called and where it's located? If so, you could win a prize in the Road Trip Picture of the Day challenge. Daniel Terdiman/CNET

Update (6:39 p.m.): The answer to today's challenge--late, as always, since I spend my days on Road Trip reporting, and then driving--is that it is the Dewey Bridge, a National Register of Historic Places honoree, on scenic route Utah-128 between Interstate 70 and Moab, Utah.

BUTTE, Montana--There's not a lot of traffic going over this bridge these days, but back in the day, this was an important piece of infrastructure.

At some point earlier on Road Trip 2009, I passed by this derelict bridge and wondered about its history and its girth. But I'm not telling you where it is because the bridge is today's Road Trip Picture of the Day challenge: I want to see if you can identify what this bridge is called, and where it's located.

My various Picture of the Day challenges have been pretty easy so far, but on Wednesday, I stumped you. For 30 whole minutes. Until then, people had been solving the mystery within about 15 minutes.

Is today a hard day, or an easy one? Only you can determine that. If you're the first person to send me an e-mail (to daniel--dot--terdiman--at--cnet--dot--com) identifying what this bridge is called and where it's located, you'll win either a DVD set or a video game prize.

Good luck.

For the next two weeks, Geek Gestalt will be on Road Trip 2009. After driving more than 12,000 miles in the Pacific Northwest, the Southwest and the Southeast over the last three years, I'll be writing about and photographing the best in technology, science, military, nature, aviation and more in Montana, Wyoming, South Dakota and Colorado. If you have a suggestion for someplace to visit, drop me a line. And in the meantime, join the Road Trip 2009 Facebook page and follow my Twitter feed.