Rachel Carson Bridge

Rachel Carson Bridge
Rachel Carson Bridge as seen from the roof of the David L. Lawrence Convention Center
Coordinates	40.4467°N 79.9998°W / 40.4467; -79.9998
Carries	Ninth Street
Official name	Rachel Carson Bridge
Other name(s)	Ninth Street Bridge
Characteristics
Total length	840 ft (260 m) (995 ft (303 m) with approaches)
Width	62 ft (19 m)
Height	78 ft (24 m)
Longest span	410 ft (120 m)
Clearance below	40.3 ft (12.3 m) above Emsworth Dam normal pool level (710 ft (220 m) above sea level)
History
Opened	November 26, 1926 (November 26, 1926)
Closed	February 11, 2019 (February 11, 2019)
Location

Rachel Carson Bridge, also known as the Ninth Street Bridge, spans the Allegheny River in Downtown Pittsburgh, Pennsylvania in the United States. The total length is 840 feet (260 m) including the 410-foot (120 m) main span and two 215-foot (66 m) side spans, or 995 feet (303 m) including the approaches. The total width of the deck is 62 feet (19 m), including the 38-foot (12 m) roadway plus two 10-foot (3.0 m) sidewalks outside the compressive plate girder. Whereas the roadway formerly carried two vehicle lanes and two streetcar tracks, it now carries four wide vehicle lanes.

Named for the naturalist Rachel Carson, a Pittsburgh native, it is one of three parallel bridges called The Three Sisters, the others being the Roberto Clemente Bridge and the Andy Warhol Bridge. The Three Sisters are self-anchored suspension bridges and are significant because they are the only trio of nearly identical bridges—as well as the first self-anchored suspension spans—built in the United States.

History

The bridge was dedicated and opened at a noon ceremony with Commissioner Babcock, Mayor Kline, and city council members including Herron and McArdle. The cost of construction was $1.46 million or $25.1 million in 2024 terms.

The bridge was renamed on Earth Day, April 22, 2006, after years of lobbying by Esther Barazzone, president of Chatham University, the alma mater of the renowned environmentalist. Carson was born in 1907 in Springdale, Pennsylvania, in a farmhouse 18 miles (29 km) up the Allegheny River, now the Rachel Carson Homestead.

On February 11th, 2019 the bridge was closed to vehicles and pedestrians for a comprehensive rehabilitation project. The bridge is expected to remain closed until at least June of 2020. Traffic is being detoured over either the Andy Warhol Bridge or the Roberto Clemente Bridge, both of which run parallel and are less than 1/2 mile away from the Rachel Carson Bridge.

Image gallery

• 
  From south bank of the Allegheny, looking NE, oblique view of roadway and south tower, showing eyebar links for main suspenders and roadway suspenders, as well as main compressive stiffening girders dividing roadway from sidewalks
• 
  Plaque on North Shore of the Rachel Carson Bridge.

See also

• List of bridges documented by the Historic American Engineering Record in Pennsylvania
• List of crossings of the Allegheny River

External links

• Historic American Engineering Record (HAER) No. PA-490-C, "Three Sisters Bridges, Ninth Street Bridge, Spanning Allegheny River at Ninth Street, Pittsburgh, Allegheny County, PA", 9 photos, 1 photo caption page
• Ninth Street Bridge at Structurae
• entry at pghbridges.com
• entry at BridgeMeister.com