Soil disturbance is a visually apparent result of using heavy equipment to harvest trees. Typical types of soil disturbance from ground-based harvest include displacement, rutting, and compaction. Subsequent consequences of soil disturbance to growth of trees, however, are variable and seldom quantified beyond short-term effects. Despite a persistent need to further quantify tree response to soil disturbance, policies and practices intended to reduce or avoid soil disturbance from logging have been widely adopted on both public and private forest lands in the Pacific Northwest (Adams 2005).