| Definition: | Displays deepest penetration in each 40 acre cell classified by 9 depth classes. |
| Black - no data | |
| Light green - (1-1000) ft | |
| Dark Green - (1001 - 2000 ft) | |
| Light Blue - (2001 - 4000 ft) | |
| Dark Blue - (4001 - 8000 ft) | |
| Pink - (8001 - 12000 ft) | |
| Red - (12001 - 16000 ft) | |
| Light Purple - (16001 - 20000 ft) | |
| Purple - (>20000 ft) |