California State Route 66

State Route 66 (SR 66) is a state highway in the U.S. state of California that runs along a section of former U.S. Route 66 (US 66) in Los Angeles and San Bernardino counties. It goes from SR 210 in La Verne east to Interstate 215 (I-215) in San Bernardino. The route primarily runs along Foothill Boulevard before becoming part of Fifth Street in San Bernardino. Though some maps and signs may still mark SR 66 as continuous through the cities of Claremont, Upland, Rancho Cucamonga, and Fontana, control of segments within those cities were relinquished to those local jurisdictions and are thus no longer officially part of the state highway system.