This document classifies and describes the various wetland types found within the Sea-Tac Airport project area, using both the Cowardin (1979) and Hydrogeomorphic (HGM) classification systems. It identifies forested, scrub-shrub, emergent, aquatic bed, and riverine wetlands across three drainage basins — Miller Creek, Des Moines Creek, and Walker Creek — listing the specific wetland units belonging to each category. The classifications support environmental impact assessment and mitigation planning associated with airport development activities.Open full document
Notes
This document describes the wetland classifications found within the Port of Seattle Sea-Tac Airport project and mitigation areas, organized by both Cowardin (1979) and Hydrogeomorphic (HGM) classification systems. It catalogs forested, scrub-shrub, emergent, aquatic bed/open water, and riverine wetlands across the Miller Creek, Des Moines Creek, and Walker Creek basins. The document references the Port’s wetland delineation completed in December 2000 and the Corps MFR confirming the delineation in February 2001.