- Rock Creek and Potomac Parkway: Shoreham Hill Bridge - Washington DCThe Shoreham Hill bridge was constructed in 1938 as part of the completion of the Rock Creek and Potomac Parkway project of the 1930s. It lies just south of the large Connecticut and Massachusetts Avenue bridges. It is the third and most northerly of three parkway crossings of Rock Creek by the parkway. The Shoreham Hill bridge replaced a steel truss bridge of 1929, which was considered by the National Park Service (NPS) as a traffic hazard and out of keeping with the established look of the parkway and its other bridges. In 1937, the NPS and the DC Board of...