Where are the United States oil reserves currently stored?

Question

Or how are they stored?

Answer 1

If you mean the US Strategic Petroleum Reserves, which were established to cushion oil markets during energy disruptions-- — nearly 700 million barrels of oil are stored in underground salt caverns along the Texas and Louisiana Gulf Coast. Here's a map of current and proposed sites:
http://www.fe.doe.gov/programs/reserves/spr/map_proposed_sites.pdf
The Department of Energy says: Emergency crude oil is stored in the Strategic Petroleum Reserve in salt caverns. Created deep within the massive salt deposits that underlie most of the Texas and Louisiana coastline, the caverns offer the best security and are the most affordable means of storage, costing up to 10 times less than aboveground tanks and 20 times less than hard rock mines.

Storage locations along the Gulf Coast were selected because they provide the most flexible means for connecting to the Nation's commercial oil transport network. Strategic Reserve oil can be distributed through interstate pipelines to nearly half of the Nation's oil refineries or loaded into ships or barges for transport to other refineries.

There are also set-aside lands with rich oil resources in several places around the country, including Alaska. Naval Petroleum or Oil Shale reserves.
The Department of Energy sites below will get you started if you want more information.

Answer 2

The facilities are in Louisiana, and Texas. The crude oil is stored in man made caverns.

Answer 3

Canada

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Answer 4

They cap a percentage of the wells to be pumped out when they need it.> underground <