Maryland Department of Transportation State Highway Administration

***TRAFFIC ALERT*** STATE HIGHWAY ADMINISTRATION TO PERFORM ROUTINE MAINTENANCE ON THE GOVERNOR THOMAS JOHNSON BRIDGE IN CALVERT AND ST. MARY'S COUNTIES

MD 4 sign

MD 4 sign

​Drivers Can Expect a Flagging Operation on Sunday Morning, June 8​

(June 4, 2025) – The Maryland State Highway Administration will perform routine maintenance on the MD 4 (Governor Thomas Johnson Bridge)​ at the Calvert County/Saint Mary’s County line starting at 6 a.m. Sunday, June 8. One of two lanes will be closed, and drivers will be guided using a flagging operation until the work is complete, weather permitting. 

Maintenance crews will repair the bridge’s wind sensor. Portable variable message signs will provide advance notification of the work.

Drivers are asked to slow down in the work zone for the safety of all drivers and the crews working to improve our roadways.

For a list of all major State Highway Administration projects, go to Project Portal, or visit the homepage at roa​ds.maryland.​gov. For a look at real-time traffic conditions, go to md511.mary​land.gov.


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