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Big Oaks NWR has been designated as a Globally Important Bird Area because of its value to migratory birds. Located on 50,000 acres five miles north of Madison on US 421 (on the closed Jefferson Proving Ground). Portions of the refuge are open for wildlife observation, photography, fishing, hunting, interpretation, and environmental education. Apr-Nov: Monday & Friday, 2nd & 4th Saturdays. Mandatory briefing and access fee permit required ($3 daily, $15 annual); fee waived for holders of migratory bird stamps, golden age pass, golden access pass, and golden eagle pass.