california state route state route route connects interstate mexico border near southern terminus near baja california northern terminus near california location route miles long heading length canal boundaries route assigned interchange constructed year later route description begins united_states mexico border near avenue international community route heads northeast canal crosses center surroundings compared developed region border mexico highway continues northward crossing turns north continues northward interchange route terminates northbound ramps route continues northward locally maintained road near interchange casino operated tribe opened national_highway_system network highways essential country economy defense mobility annual average daily traffic aadt southern end junction highest aadt highway history road south ocean ocean highway mexican border west existed paved port entry southern end highway built current alignment assigned bridges alignment constructed concrete slab bridge structure opening bridge feet long considered unable sustain traffic designed handle second bridge located interchange bridge constructed year route assigned foot long concrete box beam structure structure unlike recorded usable shape major intersections entire route
California State Route 186