“3” rating-trailered (same staging point as Seven Mile Rim)
Most of the trail to Dellenbaugh Tunnel is a sandy road interspersed with minor ledges and a few minor hills.
Two unique attractions. Dellenbaugh Tunnel (an arch below ground) emerges along the edge of scenic Spring Canyon. Secret Spire seems to defy gravity with its top-heavy load.
Dellenbaugh Tunnel is easy to walk through. It begins only a couple hundred feet from the end of the road. The tunnel is about 100 feet long and high enough one hardly needs to stoop to walk through it. The floor is a limestone layer rich in chert, and this layer extends another couple of hundred feet to an abrupt drop into lower Spring Canyon. The Secret Spire is a strange tower of Navajo Sandstone standing alone on a dome-like base.
Both require easy walks, although the tunnel is not as easy to find as the spire.