 Upper Table Rock and Lower Table Rock are two prominent volcanic plateaus located just north of the Rogue River in Jackson County , Oregon , U.S. Created by an andesitic lava flow approximately seven million years ago and shaped by erosion , they now stand about 800 feet ( 240 m ) above the surrounding Rogue Valley . The Table Rocks are jointly owned ; The Nature Conservancy is responsible for 3 @,@ 591 acres ( 1 @,@ 453 ha ) , while the Bureau of Land Management is responsible for 1 @,@ 280 acres ( 520 ha ) . 
