Lombard Street’s west end is at Presidio Boulevard inside The Presidio; it then heads east through the Cow Hollow neighborhood. For twelve blocks, between Broderick Street and Van Ness Avenue, it is an arterial road that is co-signed as U.S. Route 101. Lombard Street continues through the Russian Hill neighborhood and to the Telegraph Hill neighborhood. At Telegraph Hill it turns south, becoming Telegraph Hill Boulevard to Pioneer Park and Coit Tower. Lombard Street starts again at Winthrop Street and ends at The Embarcadero as a collector road.
Lombard Street is known for the one-way block on Russian Hill between Hyde and Leavenworth Streets, where eight sharp turns are said to make it the most crooked street in the world. The design, first suggested by property owner Carl Henry and built in 1922, was intended to reduce the hill’s natural 27% grade, which was too steep for most vehicles. It is also a hazard to pedestrians, who are accustomed to shallow inclines, up to 4.86° because of wheel chair navigability concerns. The crooked block is perhaps 600 feet (180 m) long (412.5 feet (125.7 m) straightline), is one-way (downhill) and is paved with red bricks. The sign at the top recommends 5 mph (8 km/h).
The Powell-Hyde cable car stops at the top of the block on Hyde Street
Past residents of Lombard Street include Rowena Meeks Abdy, an early California painter who worked in the style of Impressionism.