Here is a posting and warning from Thumpertalk.com....
Idaho City Dangers
A friend of a friend that was riding in the Idaho City last week/weekend and the lead rider in the group was suddenly launched from his bike. A small cable had been stung up across the trail. It hit his number plate and stopped the bike. It appeared to be done to hurt somebody on a bike or ATV. They contacted forest service and took them up there to show them. I'm not sure of all the details but thought I would let everybody know. It's definitely something to look out for and could kill somebody. If I get any more details I will post them.
Idaho City has some good trails and if you enjoy these trails do ride with caution. Regardless if one approves of motorized recreation or not this is super irresponsible and the individual needs to be caught and fully prosecuted!.....If they're arrogant enough to wire up an IC trail, what's to keep them from participating in the same reckless activities here on the Boise and/or Owyhee Fronts!
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Thread: Eco-Terrorism in Idaho City