Demographic surveys -- Oregon, Oregon -- Population -- Statistics, Sewer districts -- Oregon -- Portland Metropolitan Area
The Tri-City Service District (TCSD) and Clackamas County Service District #1 (CCSD #1), both of Clackamas County, requested that the Population Research Center (PRC) at Portland State University produce long-term population forecasts for each of the two sewer service districts. In addition, CCSD#1 requested that forecasts also be developed to include the entire city of Damascus to account for possible future annexation into its district; and the city of Milwaukie, as CCSD#1 leases services to Milwaukie. The forecast horizon extends 30 years from 2010 to 2040, and projections are produced in 5-year intervals. For the 2010-2015 interval, forecast numbers for single years are included. Forecasts for three growth scenarios – high, medium, and low scenarios – are developed to account for different probabilities of demographic events. We consider the medium growth forecast to be the most-likely scenario. We also include in this report an analysis of recent demographic trends that have bearing on our assumptions for future growth in study areas.
Portland State University. Population Research Center; Proehl, Risa S.; Vaidya, Kanhaiya; RajBhandary, Bimal; and Rancik, Kevin, "Population Forecasts for the Tri-City ServiceDistrict, Clackamas County Service District #1, Clackamas County Service District #1 with all Damascus, and the City of Milwaukie 2010-2040" (2011). Oregon Population Estimates and Reports. 23.