NABSQNO 15S-587966-4250000![]() Anvil Rock Arch, Osage County, Missouri Photo by Jay Wilbur NABSQNO 15S-587966-4250000. Anvil Rock Arch is a pillar natural arch eroded through Roubidoux dolomite. It is located on private land about 3 miles south of Westphalia, Missouri. Anvil Rock Arch appears in the second edition of the Beveridge catalog as number 322. He reports a span of 16 feet.
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