Douglas fir is a distinctive evergreen tree that can grow up to 220 feet tall. It has conical cones and spiral needle-covered twigs that hang vertically. During World War II, Douglas fir played a vital role by being used extensively in construction materials like foot lockers, pontoon bridges, stretchers, and huts due to its strength, light weight, and abundance. Over half the original virgin Douglas fir forests in Washington and Oregon were logged over the course of the last century due to its widespread use. Douglas fir has a tremendous ability to regenerate and is closely associated with many forest mammals.