Michael Baker Jr., Inc., a unit of Michael Baker Corporation, has been awarded a $1.57 million contract by the District of Columbia Department of Transportation for a comprehensive study of Long Bridge over the Potomac River to assess existing conditions and options for rehabilitation or replacing the bridge crossing in the future. The heavily-used bridge carries traffic for three railroads, CSX (the bridge owner), Amtrak and the Virginia Railway Express and is the sole railroad bridge between the District of Columbia and the Commonwealth of Virginia.