Oregon Route 173 is an Oregon state highway running from Timberline Lodge in Clackamas County to U.S. Route 26 near Government Camp. OR 173 is known as the Timberline Highway No. 173 (see Oregon highways and routes). It is 5.37 miles (8.64 km) long and runs in a northeast to southwest "L" pattern, entirely within Clackamas County., OR 173 was established in 2002 as part of Oregon's project to assign route numbers to highways that previously were not assigned, and, as of September 2010, was unsigned.