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Part of the nation's emergency oil stockpile, the Bryan Mound Strategic Petroleum Reserve Storage Site has a total storage capacity of 226 million barrels of oil. The system is composed of more than 20 10-million gallon chambers, (four of which already existed, the rest which were artificially excavated), in a salt dome, a geologic formation composed of solid salt.

The top of the dome is 1,200 feet below ground level and reaches a depth of 50,000 feet. The Bryan Mound site is close to port and terminal facilities at Freeport, TX, and at the Phillips tank farm three miles to the east. Two principal crude oil pipelines extend from Bryan Mound - a 4-mile, 30-inch-diameter line to the Phillips terminal and docks, and a 46-inch line to the ARCO Pipeline Company terminal in Texas City, TX.