The third phase of the state's widening project, between 164th Street and 132nd Street, was constructed from 2003 to 2004 and cost $27.8 million. The project included new bicycle lanes along the curb of the highway, as well as decorated sound walls. The fourth and final phase, from 132nd Street to 112th Street, was completed in May 2006 and cost $21 million to construct. The two-year project included the construction of barriers, culverts, and detention ponds along the shore of Silver Lake, which also gained a pedestrian walkway with interpretive signs.