AKA: University of Washington, Seattle (UW), Washington Park Arboretum, Sewer Trestle, Seattle, WA; Arboretum Overpass, Seattle, WA

Structure Type: built works - infrastructure - transportation structures - bridges

Designers: Willcox and Sayward, Architects (firm); William J. Sayward (architect); Walter Ross Baumes Willcox (architect)

Dates: constructed 1910

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Lake Washington Boulevard
Seattle, WA 98112

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Spans 26th Avenue, between East Roanoke Street and East Miller Street.

The Seattle firm of Willcox and Sayward designed the Arboretum's Aqueduct overpass. Both men attended the Beaux-Arts-influenced curriculum at the Massachusetts Institute of Technology (MIT) in the 1890s, and operated in a partnership for six years, from 1908-1914. Willcox left Seattle to become become an important Professor at the University of Oregon, School of Architecture and Design, in 1922. He was Head of the Department of Architecture for 21 years, from 1922-1943.

Historic Bridges/Tunnels in Washington State TR; Listed on the National Register of Historic Places, level of significance: State. City of Seattle Landmarks Board: Date introduced/referred: 12/06/1976; Date passed: 12/13/1976; Status: Passed; Vote: 8-0; Date of Mayor's signature: 12/21/1976. Two structures designed by W.R.B. Willcox were designated at the same time in 1975, the Washington Arboretum Sewer Trestle and the 8th Place West Retaining Walls in Queen Anne (1913).

Seattle Historic Landmark (1976-12-26): 106070

National Register of Historic Places (July 16, 1982): 82004229 NRHP Images (pdf) NHRP Registration Form (pdf)

PCAD id: 8079