We officially dub this natural rock formation Peek-a-Boo Bridge -- because it hides its beauty from all but the most determined seeker. USGS maps often indicate smaller, unnamed arches or bridges, but this one is not noted on any map we have seen. Although the bottom opening is arched shape, the top resembles a natural bridge. This bridge is completely unsupported for about 60 feet across, and we guess it is at least 30 feet tall. The tree skeleton below the structure is about 10 feet tall, so that gives some idea of scale:
It is 30 feet in breadth on top, wide enough and probably strong enough for a vehicle to drive over it. (However, the ascent and descent might be a little gnarly!) The bridge does support a well-used game trail, since it is the easiest way to cross a deep canyon. In this view from above, you can see the grasses and a tree growing in the soil on top of the sandstone:
Underneath, the pack rats find a convenient place to nest: 
Many swallows have built their homes here:
And tired folk can find a cool place to rest:
Here's a view through the bridge's span, looking down the canyon:
Fortunately, Steve was in charge of navigation (I was lost, as usual).
With his usual panache, he was able to find our way back to the horses and on to the nearest "ghost road" (old forgotten two track that has almost disappeared) with no difficulty.
