Flowers surround the metal fabricated castle, the official U.S. Army Corps of Engineers logo, in front of the Visitor Center, at Lake Washington Ship Canal and Hiram M. Chittenden Dam, Seattle, Washington. The ArbNet Arboretum Accreditation Program and The Morton Arboretum awarded Level II accreditation to the Carl S. English Jr. Botanical Garden, for achieving particular standards of professional practices deemed important for arboreta and botanic gardens. No other international program of accreditation exists that is specific to arboreta.