Historical Marker Program

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The American Flag (Rock Mary)

Caddo County
Location: on top of Rock Mary, southwest of Hinton
Coordinates: 35.460035, -98.425682
Material: Other (Bronze plaque)
Sponsor(s): Oklahoma Historical Society
Topics: Environmental/Cultural Ecology; Folklore/Folklife; Westward Expansion, 1803–1861

On May 23, 1849, the flag of the United States was unfurled atop the Rock Mary by Lieutenants M. P. Harrison and J. H. Simpson. The officers were part of a military detachment escorting emigrants westward. They named the rock for emigrant Mary Conway, establishing a landmark for thousands of settlers moving westward.

Note: This marker is located on private property and is inaccessible to the public.

Rock Mary

Caddo County
Location: on US-281, one mile south of Main Street in Hinton
Coordinates: 35.463136, -98.357502
Material: Aluminum
Sponsor(s): Oklahoma Historical Society and the Oklahoma Department of Transportation
Topics: Environmental/Cultural Ecology; Folklore/Folklife; Westward Expansion, 1803–1861

A prominent landmark on the California Road. On May 23, 1849, Lieutenants M.P. Harrison and J.H. Simpson climbed the landmark to raise the US flag as part of an expedition under Captain Randolph Marcy escorting emigrants through Indian Territory. They named the rock for emigrant Mary Conway, establishing a landmark for thousands of settlers moving westward.

Note: This marker no longer exists.

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To find out more about the Oklahoma Historical Society Historical Marker Program or how to submit an application, please visit the Historical Marker Program page.

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Please use our online form to report missing or damaged historical markers.

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Contact Us

If you have questions, please contact:
Matthew Pearce
Oklahoma Historical Society
800 Nazih Zuhdi Drive
Oklahoma City, OK 73105
405-522-8659
[email protected]