Horseshoe Falls is in Alger County and is about 25 feet high. June 2008, MAX7D. You can see signs for it as you drive thru Munising on M-28 and a fee is charged to visit. In the past I always skipped it because there's several other waterfalls in the area you can visit for free, but it was only $5 when I visited and it's very pretty.
Here's another shot of the same falls. MAX7D