Fort McHenry Tunnel
The Fort McHenry Tunnel is a four-tube, bi-directional tunnel that carries traffic on Interstate 95 (I-95) underneath the Baltimore Harbor. The lowest point in the Interstate System under water, the tunnel is named for nearby Fort McHenry. The tunnel was constructed from May 1980 to November 1985, at a cost of about $750 million. At the time of its opening on November 23, 1985, it was the most expensive underwater tunnel project in the United States, a record it held until being surpassed by the Big Dig project in Boston. , it is used by 43.4 million vehicles annually. Tolls are collected in both directions. The toll for cars is $3 with a Maryland E-ZPass and $4 with another state's E-ZPass. Vehicles without an E-ZPass pay more, as do those with more than two axles, up to $45 for a 6+ axle vehicle without an E-ZPass. All-electronic tolling using E-ZPass or toll-by-plate started in March 2020 as a result of the COVID-19 pandemic and was made permanent in August 2020. A project to demolish the toll plaza and replace it with overhead gantries started in 2022. Location The tunnel crosses the Patapsco River, just south of Fort McHenry and connects