The 2010 Portland Timbers season was the tenth and final season for the club in the USL Conference of the USSF Division-2 Professional League (D-2 Pro League), the second tier of the United States soccer pyramid. The D-2 Pro League was a temporary professional soccer league created by the United States Soccer Federation (USSF) in 2010 to last just one season, as a compromise between the feuding United Soccer Leagues (USL) and the North American Soccer League (NASL). An expansion club retaining the Timbers name began play in Major League Soccer (MLS) in 2011.