Maryland Department of Transportation State Highway Administration

***TRAFFIC ALERT*** STATE HIGHWAY ADMINISTRATION TO PERFORM ROUTINE MAINTENANCE ON THE GOVERNOR THOMAS JOHNSON BRIDGE ON SUNDAY MORNING, OCTOBER 5

MD 4 sign

MD 4 sign

​Crews Will Direct Traffic Using a Flagging Operation 

(October 1, 2025) - The Maryland Department of Transportation State Highway Administration will perform routine maintenance on the MD 4 (Governor Thomas Johnson) Bridge ​at the Calvert County / St. Mary’s County line starting at 6 a.m. Sunday, October 5. One of two lanes will be closed, and the lane will open to traffic no later than 2 p.m. that afternoon, weather permitting.  

Maintenance crews will clean the drainage systems and the bridge deck (driving surface). Drivers will be guided using a flagging operation. The State Highway Administration will use flaggers and portable variable message signs to guide motorists safely through the work zone.  

Drivers are asked to slow down in the work zone for the safety of all drivers and the crews working to improve our roadways. Portable variable message signs will provide advanced notification of the work. Customers may contact the District 5 Office at 410-841-1000 or 1-800-331-5603 with any questions.​

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 chart.mary​land.gov.


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