The D area controls the airspace that extends from Eugene, Oregon south to a line between Arcata and Alturus, California and 150 miles off shore.  There are three high altitude sectors (13, 14 and 15) in the D area and three low altitude sectors (30, 36 and 10).  The three high altitude sectors were originally designed to optimize the air carrier traffic between large airports, such as Seattle and Los Angeles, but as the diversity of aircraft and air travel have developed, the complexity of a formarly straight forward workload has become much more complex. Sector 13 has always served the Seattle and Portland departures to the LA Basin and Sector 14 the arrivals returning northbound. Now the air taxi companies are providing transportation from moderately sized cities, such as Eugene, Medford and Redmond, Oregon, to a wide range of destinations. Sector 15 serves not only domestic air traffic between the northwest and the San Fransisco Bay area but also a very busy oceanic route to Alaska and the Orient.  The three low altitude sectors (36 between Medford and Eugene, 30 from Medford to Arcata and 10 to the east of Medford, provide both VFR and IFR services to an assorted mixture of civilian and military aircraft. D area controllers provide approach control services to several airports which are geographically and operationally dissimilar, with great detail paid to weather dissemination and terrain hazards. The D area includes vast military airspace to serve the local air combat training facility and provides both approach and tower services when civilian and military facilities close at night.