A ship’s hull, burned to the waterline decades ago, rests in Mallows Bay on the Potomac River near La Plata, Maryland. The area in Maryland, that’s home to abandoned World War I-era steamships, has been designated a new national marine sanctuary on Monday. (James M. Thresher/The Washington Post)

An area in Maryland that’s home to abandoned World War I-era steamships has been designated a new national marine sanctuary.

The National Oceanic and Atmospheric Administration, the state of Maryland and Charles County announced the Mallows Bay-Potomac River National Marine Sanctuary on Monday. It contains more than 100 abandoned steamships and vessels that were built as part of the nation’s engagement in World War I.


The pink area shows the Mallows Bay-Potomac River National Marine Sanctuary. (NOAA)

A World War I-era vessel at low tide showing the hull frame. (Don Shomette)

It’s about 40 miles south of Washington, D.C., along an 18-mile stretch of Potomac River coast in Charles County. It will be the first national marine sanctuary designated since 2000. Maryland nominated the area for sanctuary designation in 2014 to conserve the shipwrecks and increase opportunities for public access, tourism and economic development.

“We look forward to working with the state of Maryland, Charles County and other local partners to foster education and research partnerships as well as support and enhance local recreation and tourism along this historic stretch of the Potomac River,” said Neil Jacobs, NOAA’s acting administrator.


An aerial view of Mallows Bay, a portion of the Potomac River about 40 miles south of Washington. (Don Shomette)

Mallows Bay is known for its “Ghost Fleet,” including partly submerged remains of more than 100 wooden steamships that were built in response to threats from World War I-era German U-boats. While the ships never saw action during the war, their construction at more than 40 shipyards in 17 states was part of the national wartime effort that fueled the economic development of waterfront communities and maritime services industries.

Some of the wrecks date back to the Civil War and the landscape includes sites that represent the history of Native American communities in the area.

The wrecks also provide shelter for wildlife, including beaver and osprey.

“There’s good reason that the Mallows Bay-Potomac River National Marine Sanctuary will be the first national marine sanctuary created in the last two decades — it’s a unique blend of historical, recreational and habitat resources with strong public support for its protection,” said U.S. Senator Ben Cardin of Maryland.

The sanctuary designation will take effect after 45 days of congressional session after publication of the action in the Federal Register.