Part 4 Trends And Forecasts

STCPThe Sea-Tac Communities Plan (1976)

In order to determine adequancy of existing Airport facilities and future facility requirements, as well as future relationships between the Airport facilities and the surrounding communities , it is first necessary to estimate demand for facilities generated by future air traffic volumes . The volume and type of air traffic generated in an area is a reflection of the socio-economic character of that area. Thus , the first step in the develop- ment of the Master Plan for Sea-Tac International Airport was to analyze current and projected population and economic growth. The Central Puget Sound Region is located in the northwestern corner of Washington State . Near the center of this area, which surrounds Puget Sound, is Seattle , the largest city on the West Coast north of San Francisco . Other notable urban areas include the cities of Tacoma, Bellevue, Everett , Bremerton , and Renton . In 1970 , the four- county area had 1, 934 , 628 inhabitants, accounting for 56% of the State' s population. The area experienced substantial population growth during the 1950's and 1960's. The average annual rate of growth during the 1950' s was 2.4% approximately 1 . 3 times the national average. The population of the region increased from 1 , 196 , 172 in 1950 to 1, 512 , 979 in 1960 . The annual rate of population growth was almost double that of the national average during 1965 and 1968 . This trend has reversed itself in the 1970's .…
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