Within Clark County, Washington population has grown at a much higher rate than employment. Clark County is a part of the Portland-Vancouver Metropolitan area but is separated from the remainder of the counties in the SMSA by the Columbia River and it is in another state. Since an increasing number of Clark County, Washington residents work in Oregon this uneven growth rate -- between population and employment -- has imposed unique transportation requirements.
Statistical analysis verified the influence of population growth on Columbia River crossing travel demand. A survey of key informants and other investigations led to a conclusion that a number of factors will modify growth patterns in the future so that employment can "catch up" with population growth.
This study, together with other reports concerning transportation demand and facilities, provides an assessment of the future conditions and developments of Clark County that will help determine the basic transportation needs. Likewise, this study provides information about those social, economic, and land use factors that is of value in determining the type and general location of improvements. More specifically, it substantiates previous studies which concluded that additional major Columbia River crossing facilities will not be needed in the near future.