Patapsco River
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The Patapsco is a river in central and coastal Maryland. While it begins at the confluence of two named branches approximately 50 miles inland, it is a minor river for most of its length; however, its last 10 miles are a large tidal estuary inlet of Chesapeake Bay. The inner part of this estuary provides the harbor of Baltimore, comprised of the Northwest Harbor and the Middle Branch. (See Baltimore Inner Harbor.) Another inlet, to the south, is Curtis Bay.
The Patapsco is crossed by the Baltimore Harbor Tunnel (Interstate 895), the Fort McHenry Tunnel (Interstate 95), and the Francis Scott Key Bridge (Interstate 695). Notable railway bridges include the Thomas Viaduct and the ruins of the Patterson Viaduct.