K Street Bridge, Road bridge over Rock Creek in Washington, D.C., United States

K Street Bridge crosses Rock Creek with two stacked levels, where the lower level carries K Street and the upper level supports the Whitehurst Freeway. The structure connects downtown Washington to Georgetown while providing access to nearby parklands.

The first bridge here, a stone arch built in 1792, was only the second crossing of Rock Creek, after M Street. Its center arch was demolished in 1795 because the structure was unstable. A wooden bridge followed in 1869 and was replaced in 1907 by a steel-plate girder bridge. Rising traffic after the Rock Creek and Potomac Parkway opened in 1936 led to the current lower level (1939–1941) and upper level (1947–1949).

K Street, which the bridge connects to, is filled with law offices, advocacy groups, and political organizations that shape daily activity in the area. The location reflects Washington's focus on business and influence.

The bridge accommodates multiple lanes of vehicle traffic and serves as a major connection between the two parts of the city. Visitors should note the complex ramp systems that direct traffic entering and leaving the structure.

The flanking ramps built in the early 1960s held unused branches meant to link the never-built North Leg of the Inner Loop Expressway; they were demolished in the mid-1990s. The designers of the current bridge also designed the Charles C. Glover Memorial Bridge upstream.