Data Recovery Excavations for the Howard Hanson Dam Additional Water Storage Project

Categorized Under: Environment



ICF conducted an archaeological data recovery and excavation at four prehistoric sites discovered during preliminary Section 106 compliance work behind the Howard A. Hanson Dam. During low-water regimes at the reservoir, several archaeological sites were discovered during preliminary Section 106 compliance work.

Additional data recovery work at these sites was stipulated in a Memorandum of Agreement (MOA) between the U.S. Army Corps of Engineers, the City of Tacoma, and Muckleshoot Indian Tribe. Per the MOA, the data recovery work to be carried out at the sites by ICF keeps the U.S. Army Corps of Engineers in compliance with Section 106.

ICF conducted data recovery excavations at four sites within the Howard A. Hanson Dam Reservoir drawdown area. These sites congregate near 1,100 feet above sea level on what used to be an ancient terrace above the free-flowing Green River. Previous research indicated that these sites document prehistoric use of the area stretching back for the last 6,000 years of human occupation of the Puget Sound. All sites were accurately mapped using GPS technology and tied to surveyed benchmarks. A monitoring system was established at each site to record the rate of erosion because of the fluctuating reservoir pool levels.

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Insight Details

Client: U.S. Army Corps of Engineers
Location: Seattle District, King County, WA

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