The entrance to the refuge is on U.S. Highway 421, on the former Jefferson Proving Ground, five miles north of Madison, Indiana. Enter at the main entrance of the former Jefferson Proving Ground and follow the brown directional signs to Big Oaks office, 1661 West Niblo Road. Office phone 812-273-0783, bigoaks@fws.gov.

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Big Oaks NWR 1661 W. JPG Niblo Road Madison, IN 47250

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