| Name | Hidden Arch |
| Alternative Names | RR 21 |
| Width of Arch | |
| Height of Arch | |
| Span of Arch | 6 |
| Type of Arch | Pillar |
| Upper Rock Layer | Pikeville Formation: Shale | siltstone | sandstone | coal |
| Lower Rock Layer | Corbin Sandstone Member of Grundy Formation: Sandstone | conglomeratic sandstone | conglomerate | minor shale |
| Status | |
| Latitude | 37.7883333 |
| Longitude | -83.63972219999999 |
| Elevation | |
| Land Owner | USDA |
| Name of Land | Daniel Boone National Forest |
| County | Wolfe |
| Azimuth | |
| Documented by | Chris Moore |
| Submitted by | Christopher Morris |