The Baltimore Harbor Tunnel is a pair of two-lane road tunnels carrying Interstate 895

Interstate 895 (Maryland)

Interstate 895 is an Interstate Highway in the U.S. state of Maryland. Known as the Harbor Tunnel Thruway, the highway runs between one junction with I-95 in Elkridge and another interchange with I-95 on the east side of Baltimore. I-895 is a toll road that crosses the Patapsco River estuary...

—the Harbor Tunnel Thruway—under the Patapsco River

Patapsco River

The Patapsco River is a river in central Maryland which flows into Chesapeake Bay. The river's tidal portion forms the harbor for the city of Baltimore...

 southeast of downtown Baltimore, Maryland, United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

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The pair of tunnels is 1.45mi. 7650 feet (2.33 km) long, stretching from the south shore of the Patapsco River

Patapsco River

The Patapsco River is a river in central Maryland which flows into Chesapeake Bay. The river's tidal portion forms the harbor for the city of Baltimore...

 to the north shore near Dundalk

Dundalk, Maryland

-Demographics:As of the census of 2000, there were 62,306 people, 24,772 households, and 16,968 families residing in the CDP. The population density was 4,689.5 people per square mile . There were 26,385 housing units at an average density of 1,985.9 per square mile...

. Each tunnel is 22 feet (6.7 m) wide and 14 feet (4.3 m) high, and accommodates two lanes in each direction.