In Bayfield County Forest, across the road from the old Town of Bell Cemetery, is the trailhead to Lost Creek Falls. From there it’s less than a half-hour hike to the falls.
On my recent visit it was easy to find the “lost” creek and falls, but my wife lost her sunglasses, I lost her cousin’s dog (temporarily) and the crotch of my shorts ripped while I was climbing a ledge (making those shorts “lost” from my wardrobe). There’s also a geocache out there we couldn’t find. So maybe that’s how the trail gets its name.