The Port of Avon is located on the southern shores of Suisun Bay in central California. The Port of Avon is almost 40 kilometers (24 miles) inland from San Francisco and almost 70 kilometers (41 miles) west-northwest of Stockton. An unincorporated town in Contra Costa County, the Port of Avon lies on the route of the old Southern Pacific Railroad.
Its first name was Marsh and, in 1913, the Port of Avon was named Associated after the Tidewater Associated Oil Company that owned the property. Facilities at the Port of Avon were owned by Tosco Refining Company until it merged with Phlllips Petroeum in 2001. Phillips merged with Conoco in 2002 to become ConocoPhillips.
Today, Tosco Refining Company's San Francisco Area Refinery owns and operates two wharves at the Port of Avon. The ConocoPhillips Tanker Wharf at the Port of Avon is used to receive and ship petroleum products by both barge and tanker. It also occasionally receives crude oil. Located about 1.5 miles from the Union Pacific Railroad Bridge on the southern shores of Suisun Bay, the wharf's sections are connected by a 30-meter (100-foot) walkway. This Port of Avon wharf is equipped with several pipelines that connect to 29 steel storage tanks with a total capacity for one million barrels. There are 81 more storage tanks nearby with total capacity for 6.7 million barrels. The wharf is served by rail tracks to tank car loading racks, warehouses, and a drumming plant at the refinery. The tracks connect with the Union Pacific Railroad and the Burlington Northern Santa Fe Railway. The wharf is 459 meters (1505 feet) long with alongside depth of 12 meters (40 feet) MLLW.
The Barge Wharf at the Port of Avon, also owned by ConocoPhillips, is used to ship petroleum products by barge. Located at the rear of the Port of Avon Tanker Wharf, it is served by the same pipelines, which also connect with Kinder Morgan Energy Partners LLP pipelines. It is also served by the same rail tracks as the Port of Avon's Tanker Wharf. The Barge Wharf has berthing space of 107 meters (350 feet) with alongside depth of 5.5 meters (18 feet) MLLW.
The Port of Avon has a Mediterranean climate with wet mild winters and dry hot summers. The Port of Avon receives about 14 inches of rain each year, falling mostly in the winter. Temperatures range from an average low of 3°C (38°F) in January to an average high of 34°C (94°F) in July.