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The Gunpowder River is a river in Maryland, United States. It is formed by the joining of Big Gunpowder Falls and Little Gunpowder Falls. Big Gunpowder begins in the extreme southern part of Pennsylvania's York County. From there, the "Big Gunpowder" flows in a generally southeast direction through the length of Baltimore County until it reaches Joppatowne where it is joined by the "Little Gunpowder" and the Bird River becoming simply the "Gunpowder River" once it passes the Amtrak train bridge that runs from Chase to Joppa.