Wetland Classification and Mapping of Seward, Alaska



Map Unit Descriptions


Ecosystem: Headwater Fen


Map Units: H23; H32


Seward Area Extent: 

H23: 4 wetland polygons; 16.3 acres

H32: 3 wetland polygons; 7.3 acres

The H2 portion of an H23 fen on the glacier-cut bedrock bench above Fourth of July Creek.  Tufted bulrush and tall cottongrass, both good indicators of a near-surface water table, occupy most of the foreground in the photo.  Small H3 areas can be seen as lighter colored hummocks in the distance, and center left.


Wetland Indicators

Type: Peat

Average depth to water table: 10 cm

Organic layer thickness: 146 cm

Average depth to redoximorphic features: n/a

Common Soils: Typic Cryohemists, Typic Cryosaprists, Terric Cryosaprists

Common Plant communities:


Sphagnum - Tall cottongrass (Eriophorum angustifolium)


Fewflower sedge (Carex pauciflora)

Fewflower sedge - tufted bulrush (Carex pauciflora - Tricophorum caespitosum)


NWI: PEM1Bg (H2); PSS1,3&4Eg (H3)

HGM: Terrene Basin groundwater-dominated Throughflow headwater.

H32 and H23 wetlands are combinations of low-lying spots where the water table is at of near the surface, and fewflower sedge fens, where the water table is deeper.  If low-lying areas predominate the fen is named H23, and if fewflower sedge is dominant it is named H32.

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