Many individuals and organizations have assisted Seattle ARCH efforts since the group’s inception in 2014.  Current and former members of Seattle ARCH include Priscilla Arsove, Lyle Bicknell, Kenan Block, Allan Davis, Rainer Metzger, Anna Rudd and Allan Seidenverg. 

Seattle A.R.C.H. is a proposed ruin from the never-used R.H. Thomson Expressway symbolizing the importance of grass roots activism. It stands to remember, celebrate and honor the citizen activists who worked together to stop another freeway from tearing up Seattle neighborhoods in the 1960s, and it serves to show future activists that civic engagement can produce big results.