In my estimations the arch has a span of 30-40 feet and a height of 25 feet.  Not as impressive as what you would see in southern Utah (Arches NP, Zion NP), but still pretty neat--it's not something you see everyday.

The trail up to this point and then up to the arch is a pretty tough scramble over a bunch of loose rock.

To get the Fay Canyon Trail description and locator map from the Forest Service, click here.