Boulder Canyon Airport (Belding, MI) 56C 备注
| A57-25 | Approach ratio 0:1 to dthr ovr 40 ft tree, 5 ft dist, 110 ft R. |
| A57-07 | Approach ratio 0:1 to dthr ovr 20 ft tree, 0 ft dist, 110 ft R. |
| A42-25 | Runway and dthr marked with 3 ft yellow cones. |
| A42-07 | Runway and dthr marked with 3 ft yellow cones. |
| A110-4 | Airport closed NOV-APR and when snow covd. |
| A110-3 | Runway 07/25 20-60 ft trees in primary surface, 80-110 ft from centerline, both sides. |
| A110-1 | For clearance contact great lakes approach at 269-459-3344, when approach closed contact chicago artcc at 630-906-8921. |
