Prior to its decommissioning in 2010, it ran easterly about 3 miles (4.8 km) from eastern Kirkland to central Redmond.

SR 908 started at its western end when Central Way in Kirkland crosses under Interstate 405, at Exit 18 of I-405.

SR 908 then reached downtown Redmond, where it ended at its intersection with State Route 202.

While SR 908 was officially classified as a child route of I-90, the two roadways never connected and were about 10 miles (16 km) apart.

In 1989, as part of a Kirkland-led project to rebuild Lake Washington Boulevard, the state legislature considered decommissioning part of SR 908 and transfer ownership to the city; the bill failed to advance past the House Transportation Committee.