According to Wikipedia, this is believed to be the world’s only Bigfoot trap, in the Sikiyou National Forest in Jackson County, Oregon. It was built in 1974 by Eugene, Oregon’s North American Wildlife Research Team.
NAWRT baited the trap for six years with carcasses (don’t ask what kind, there’s a good chap). They caught only bears, which seems to be adding insult to injury. It was abandoned and deteriorating until 2006 — hope there wasn’t a poor bear caught in there when they abandoned it — when, according to Wikipedia, the National Forest Service took over preserving it as a site of historical importance as part of their Passport In Time program.
I can’t find the thing on the Passport in Time website, so maybe the Wiki info is erroneous. A landscaper named Vaden, however, has GPS coordinates and other info. Southern Oregon’s Mail Tribune has an article about the site, which is on the Collings Mountain Trail, near Applegate Lake.
Image in public domain, from Wikipedia.