The mid to upper slopes of Barker Mountain are included within the preserve, from about 3,200 - 4,000 feet in elevation.  There is a broad, east- west ridgetop, with ledges and steep, rocky slopes on the south side, and small depressions with seeps on the north side.  This 120-acre preserve protects examples of shrub-grassland ecosystems ("shrub-steppe"), including a large area of antelope bitterbrush/Idaho fescue habitat on the gently sloping summit ridge.  Ponderosa pine, Douglas-fir, and antelope bitterbrush form a mosaic with the grassland patches and represent an important forest type within the foothills of the Okanogan Highlands of north- central Washington.  (Okanogan County)