NABSQNO 15S-621260-4045220![]() Grand Gulf Natural Bridge, Oregon County, Missouri Photo by Robert Vreeland NABSQNO 15S-621260-4045220. Grand Gulf Natural Bridge is a waterfall natural bridge eroded through Jefferson City dolomite by Bussell Branch. It is located in Grand Gulf State Park about 6 miles west of Thayer, Missouri. Grand Gulf Natural Bridge appears in the Vreeland catalog as number 14-21, and in the second edition of the Beveridge catalog as part of number 338. Vreeland reports a span of 20 feet.
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