Wetland Classification and Mapping of Seward, Alaska

An extension of wetland classification and mapping of the Kenai Lowland

 

Map Unit Descriptions

 

Ecosystem: Relict Glacial Drainageway

 

Map Component: DW5A

 

Seward Area Extent: 1 wetland polygon; 147.5 acres.

 

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Wetland Indicators

Type: Mineral soil with some pockets of peat

Depth to water table: 33 cm on 30 July 2006

Organic layer thickness: 8 cm

Depth to redoximorphic features: 10 cm

Soil: Typic Cryaquent

Plant community:

Sitka spruce / Sitka alder (Picea sitchensis / Alnus viridis ssp. sinuata)

 

NWI: PFO4

HGM: Terrene Slope/Flat groundwater-dominated throughflow wetland.

 

A single large, spring fen complex was mapped as DW5A, the foested Relict Glacial Drainageway ecosystem wetland component.  It lies at the foot of the mountains east of Seward, between Glacier Creek and Sawmill Creek.  Most of the spring fen is forested, but a small opening (DW3) is occupied by willows, alders, bluejoint reedgrass and sedges.  The southern margin of the fen is open and dominated by willows and Sitka and Lyngbye's sedge. 

The water table is near the surface and groundwater is probably enriched by good contact with the mineral substratum.  A stream draining an unnamed glacier south of the Bear Lake Glacier seems to feed the large complex through the alluvium at the mouth of its mountain valley.  The southern end of the complex re-forms into a stream that flows into Sawmill Creek.  Groundwater, from the mountains and from a large rock drumlin on its western edge, also contributes to the fen. 

 


Do I Need a Permit?

 Introduction and Key to Plant Communities  

Introduction and Key to Ecosystems

    Seward Soils    Map Unit Summary    Methods    Glossary

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Contact: Mike Gracz
Kenai Watershed Forum 
Homer Field Office
Old Town Professional Center
3430 Main Street Suite B1
Homer, AK  99603
907-235-2218

12 February 2007 15:13