Wetland Classification and Mapping of Seward, Alaska



Map Unit Descriptions


Ecosystem: Headwater Fen


Map Units: H34; H43


Seward Area Extent: 

H34; 5 wetland polygons; 35.8 acres

H43: 1 wetland polygon; 1.1 acres

Mountain hemlock forest dominates the H4 foreground of this photo, with fewflower sedge (H3) in the openings behind.


Wetland Indicators

Type: Peat or mineral soil

Average depth to water table: 28 cm

Organic layer thickness: 104 cm if peat, 13 if mineral soil

Average depth to redoximorphic features: n/a, if peat, 20 cm if mineral soil

Common Soils: Typic Cryohemists, Typic Cryosaprists, Terric Cryosaprists, if peat, Typic Cryaquents if mineral soil

Common Plant communities:


Fewflower sedge (Carex pauciflora)


Mountain hemlock / early blueberry (Tsuga mertensiana / Vaccinium ovalifolium)


NWI: PSS1,3&4Eg (H3); PFO4Eg (H4)

HGM: Terrene Basin groundwater-dominated Throughflow headwater.

Mountain hemlock with an early blueberry understory in a Headwater Fen ecosystem wetland indicates H4.  H3 fens are dominated by fewflower sedge.  Where the forest predominates (at a single wetland) a fen is named H43, when sedge dominates it is named H34.

Headwater Fen Ecosystem wetlands are sloping peatland fens at or near the headwaters of first-order streams.  Seward area Headwater Fens are mapped only on the 800' elevation glacier-cut bedrock bench above Fourth of July Creek.


Do I Need a Permit?

 Introduction and Key to Plant Communities  

Introduction and Key to Ecosystems

Seward Soils    Map Unit Summary    Methods    Glossary



Contact: Mike Gracz
Kenai Watershed Forum 
Homer Field Office
Old Town Professional Center
3430 Main Street Suite B1
Homer, AK  99603

12 February 2007 15:17