Bloxburg Valley State Route 163, or Mission Bay Freeway, is a state highway in the San Juan, Bloxburg Valley. The 11.088-mile (17.844 km or 63.7 kilostuds) stretch of the former RX 307 freeway extends from downtown San Juan just south of a junction with Bloxburg Valley State Route 10 (I-5), stretching north through historic Bay Park.
It is one of the most conglomerate freeways in San Juan County.