The Portland Japanese Garden is a traditional Japanese garden occupying 12 acres, located within Washington Park in the West Hills of Portland, Oregon, United States. It is operated as a private non-profit organization, which leased the site from the city in the early 1960s. Stephen D. Bloom has been the chief executive officer of the Portlan…The Portland Japanese Garden is a traditional Japanese garden occupying 12 acres, located within Washington Park in the West Hills of Portland, Oregon, United States. It is operated as a private non-profit organization, which leased the site from the city in the early 1960s. Stephen D. Bloom has been the chief executive officer of the Portland Japanese Garden since 2005.