National Wetland Inventory Classification System

M-Marine

  1. Subtidal

    RB-Rock

      1. Bedrock

      2. Rubble

    UB-Unconsolidated Bottom

      1. Cobble Gravel

      2. Sand

      3. Mud

      4. Organic

    AB-Aquatic Bed

      1. Algal

      3. Rooted Vascular

      5. Unknown Submergent

    RF-Reef

      1. Coral

      3. Worm

    OW-Open Water/Unknown Bottom

  2. Intertidal

    AB-Aquatic Bed

      1. Algal

      3. Rooted Vascular

      5. Unknown Submergent

    RF-Reef

      1. Coral

      2. Worm

    RS-Rocky Shore

      1. Coral

      3. Worm

    US-Unconsolidated Shore

      1. Cobble Gravel

      2. Sand

      3. Mud

      4. Organic

E-Estuarine

  1. Subtidal

    RB-Rock Bottom

      1. Bedrock

      2. Rubble

    UB-Unconsolidated Bottom

      1. Cobble Gravel

      2. Sand

      3. Mud

      4. Organic

    AB-Aquatic Bed

      1. Algal

      3. Rooted Vascular

      4. Floating Vascular

      5. Unknown Submergent

      6. Unknown Surface

    RF-Reef

      2. Mollusc

      3. Worm

    OW-Open Water/Unknown Bottom

  2. Intertidal

    AB-Aquatic Bed

      1. Algal

      3. Rooted Vascular

      4. Floating Vascular

      5. Unknown Submergent

      6. Unknown Surface

    RF-Reef

      2. Mollusc

      3. Worm

    SB-Streambed

      1. Cobble-Gravel

      2. Sand

      3. Mud

      4. Organic

    RS-Rocky Shore

      1. Bedrock

      2. Rubble

    US-Unconsolidated Shore

      1. Cobble-Gravel

      2. Sand

      3. Mud

      4. Organic

    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. Deciduous

      7. Evergreen

    FO-Forested

      1. Broad Leaved Deciduous

      2. Needle-Leaved Deciduous

      3. Broad-Leaved Evergreen

      4. Needle-Leaved Evergreen

      5. Dead

      6. Deciduous

      7. Evergreen

R-Riverine

  1. Tidal

  2. Lower Perennial

  3. Upper Perennial

  4. Intermittent

  5. Unknown Perennial

    RB-Rock

      1. Bedrock

      2. Rubble

    UB-Unconsolidated Bottom

      1. Cobble-Gravel

      2. Sand

      3. Mud

      4. Organic

    SB-Streambed

      1. Bedrock

      2. Rubble

      3. Cobble-Gravel

      4. Sand

      5. Mud

      6. Organic

      7. Vegetated

    AB-Aquatic Bed

      1. Algal

      2. Aquatic Moss

      3. Rooted Vascular

      4. Floating Vascular

      5. Unknown Submergent

      6. Unknown Surface

    RS-Rocky Shore

      1. Bedrock

      2. Rubble

    US-Unconsolidated Shore

      1. Cobble-Gravel

      2. Sand

      3. Mud

      4. Organic

      5. Vegetated

    EM-Emergent

      2. Nonpersistent

    OW-Open Water/Unknown Bottom

L- Lacustrine

  1. Limnetic

    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

    OW-Open Water/Unknown Bottom

  2-Littoral

    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

    RS-Rocky Shore

      1. Bedrock

      2. Rubble

    US-Unconsolidated Shore

      1. Cobble-Gravel

      2. Sand

      3. Mud

      4. Organic

      5. Vegetated

    EM-Emergent

      2. Nonpersistent

    OW-Open Water/Unknown Bottom

P-Palustrine

    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

    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. Deciduous

      7. Evergreen

    FO-Forested

      1. Broad-Leaved Deciduous

      2. Needle-Leaved Deciduous

      3. Broad-Leaved Evergreen

      4. Needle-Leaved Evergreen

      5. Dead

      6. Deciduous

      7. Evergreen

    OW-Open Water/Unknown Bottom

Modifiers

Water Regime

    Non-Tidal

      A Temporary Flooded

      B Saturated

      C Seasonally Flooded

      D Seasonally Flooded/Well Drained

      E Seasonally Flooded/Saturated

      F Semipermanently Flooded

      G Intermittently Exposed

      H Permanently Flooded

      J Intermittently Flooded

      K Artificially Flooded

      W Intermittently Flooded/Temporary

      Y Saturated Semipermanent/Seasonal

      Z Intermittently Exposed/Permanent

      U Unknown

    Tidal

      K Artificially Flooded

      L Subtidal

      M Irregularly Exposed

      N Regularly Flooded

      P Irregularly Flooded

      S Temporary-Tidal

      R Seasonal-Tidal

      T Semipermanent-Tidal

      V Permanent-Tidal

      U Unknown

Water Chemistry

    Coastal Halinity

      1. Hyperhaline

      2. Euhaline

      3. Mixohaline (Brackish)

      4. Polyhaline

      5. Mesohaline

      6. Oligohaline

      0. Fresh

    Inland Salinity

      7. Hypersaline

      8. Eusaline

      9. Mixosaline

      0. Fresh

    pH Modifers for all Fresh Water

      a Acid

      t Circumneutral

      l Alkaline

Soil

      g Organic

      n Mineral

Special Modifiers

      b Beaver

      d Parially Drained/Ditched

      f Farmed

      h Diked/Impounded

      r Artificial Substrate

      s Spoil

      x Excavated