NABSQNO 19T-349040-4937155Screw Auger Falls Arch, Oxford County, Maine Photo by Bill Gorman NABSQNO 19T-349040-4937155. Screw Auger Falls Arch is a small, buttress natural arch eroded through granitic rock. Because of its proximity to a waterfall, it would be easy to mistake this arch for some type of natural bridge. However, it is clear from its shape and appearance that it formed as a buttress natural arch. It is located beside Screw Auger Falls in Grafton Notch State Park, Oxford County, Maine. Access is via a park trail leading from a parking lot along State Highway 26. The arch has a span of about 5 feet.
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