| Key Facts |
| Bridge Name | Facility Carried / Feature Intersected | Location | Structure Type | Construction Date / Builder or Contractor | |
|---|---|---|---|---|---|
|
9th Street Bridge
Rachel Carson Bridge | 9th Street Over Allegheny River | Pittsburgh: Allegheny County, Pennsylvania | Metal Through Plate Girder Stiffenin Eyebar Suspension, Stationary | 1926 By: American Bridge Company of New York, New York |
| Technical Facts |
| Rehabilitation Date | Main Span Length | Structure Length | Roadway Width | Main Spans | Approach Spans |
| 1994 | 410 Feet (125 Meters) | 995 Feet (303.3 Meters) | 38 Feet (11.6 Meters) | 1 | 2 |
The Ninth Street Bridge is one of three identical bridges that sit by side and are known as the "Three Sisters Bridges." They are unusual bridges due to the fact that instead of having cables, they use eye-bars. This gives them quite a different appearance from the average cable suspension bridge. Stiffening for the bridge is accomplished by through plate girders. They were the first examples of self-anchored suspension bridges, meaning the towers are rigid, and they hold the eye-bars, so no anchorage is needed.
