ⓘ California State Route 84

                                     

ⓘ California State Route 84

State Route 84 is a state highway in the U.S. state of California that consists of two unconnected segments, one in the San Francisco Bay Area and the other primarily in the Sacramento–San Joaquin River Delta area.

The first section - "East–West" arterial road running from SR 1 to San Gregorio to Menlo Park via the Dumbarton bridge through Fremont and Newark and ending at I-580 in Livermore. The segment between Marsh road and the Dumbarton bridge has been upgraded to Expressway, known as the Expressway Bay. The segment from the Eastern end of the Dumbarton bridge to the interchange with I-880 has been updated to the highway.

The other section is a North-South highway that begins at SR 12 in Rio Vista, passes through Ryer island, where it connects to SR 220, and ends in West Sacramento. In Ryer island ferry provides passage across cache Slough from Rio Vista to Ryer island. The ferry is diesel boats operated by Caltrans, and is in operation twenty-four hours a day and collects tribute. No plans to link the two unrelated segments of SR 84 at this time.