WASHINGTON STATE DEPARTMENT OF TRANSPORTATION (WSDOT) / I-405 PROJECTS, KING COUNTY, WA

JBR cultural resources staff conducted the cultural resource assessments pursuant to Section 106 of the NHPA and prepared technical reports for the WSDOT I-405 Corridor Program on three logistically complex projects. WSDOT is proposing to implement a series of interchange improvements and lane additions along the entire length of I-405. The cultural resource assessment identified prehistoric toolstone scatters, isolated finds, linear historic features, more than 150 historic properties, and an extensive historic site comprising a late 19th-century coal mining component and 20th-century historic dump. Work included background archaeological, historical, and extensive tax parcel data research; identification and delimiting of Areas of Potential Effects using GIS; pedestrian archaeological survey and subsurface sampling; drafting of standard field methodologies and sampling designs; preparation of archaeological site forms; formal testing at identified archaeological sites; evaluation of archaeological sites and historic properties for National Register eligibility; preparation of Historic Property Inventory Forms; scale architectural drawings of plan views and profiles;  artifact illustration; and mitigation recommendations.

• Rebekah Brooks - Seattle Manager -