Palustrine Wetland Codes - National Wetlands Inventory Habitat Classification: 

SYSTEM              SUBSYSTEM        CLASS                     SUBCLASS

                                  |_ RB=Rock Bottom            1=Bedrock
                                  |                            2=Rubble
                                  |
                                  |_ UB=Unconsolidated Bottom  1=Cobble-Gravel
                                  |                            2=Sand
                                  |                            3=Mud
                                  |                            4=Organic
                                  |
                                  |_ AB=Aquatic Bed            1=Algal
                                  |                            2=Aquatic Moss 
                                  |                            3=Rooted Vascular
                                  |                            4=Floating
                                  |                              Vascular
                                  |                            5=Unknown 
                                  |                              Submergent
                                  |                            6=Unknown Surface
                                  |
                                  |_ US=Unconsolidated Shore   1=Cobble-Gravel
                                  |                            2=Sand
                                  |                            3=Mud
                                  |                            4=Organic
                                  |                            5=Vegetated
                                  |
                                  |_ ML=Moss-Lichen            1=Moss
                                  |                            2=Lichen
                                  |
P=PALUSTRINE______________________|_ EM=Emergent               1=Persistent
                                  |                            2=Nonpersistent
                                  |
                                  |_ SS=Scrub-Shrub            1=Broad-Leaved
                                  |                              Deciduous
                                  |                            2=Needle-Leaved
                                  |                              Deciduous
                                  |                            3=Broad-Leaved 
                                  |                              Evergreen
                                  |                            4=Needle-Leaved
                                  |                              Evergreen
                                  |                            5=Dead
                                  |                            6=Indeterminate
                                  |                              Deciduous
                                  |                            7=Indeterminate
                                  |                              Evergreen
                                  |
                                  |_ FO=Forested               1=Broad-Leaved
                                  |                              Deciduous
                                  |                            2=Needle-Leaved
                                  |                              Deciduous
                                  |                            3=Broad-Leaved
                                  |                              Evergreen
                                  |                            4=Needle-Leaved
                                  |                              Evergreen
                                  |                            5=Dead
                                  |                            6=Indeterminate
                                  |                              Deciduous
                                  |                            7=Indeterminate
                                  |                              Evergreen
                                  |
                                  |_ OW=Open Water/Unknown Bottom (used on older maps)