- This 35 acre preserve, located on a glacial outwash plain, protects an example of the “Mima Mound” landscape and a small remnant of native Puget prairie grassland, which is dotted with large glacial cobbles. The landscape is a gently rolling plain with low swales and rises. The largest known population of golden paintbrush, a federally listed threatened plant species, grows on the preserve. A state-listed sensitive plant species that grows only in Puget prairies, white topped aster, is also protected on the preserve.