MP: 9.34 Location: Yelm Hwy SE and St Clair Cut-Off Rd SE, Lacey Almost halfway through the route, we finally get signage acknowledging the routes presence. This is exciting. SR 510 moves off the Yelm Hwy and onto St Clair Cut-off Rd   MP: 6.4 Location: Old Pacific Hwy SE and St Clair Cut-off Rd … Continue reading State Route 510, SR 507 to I-5