| Piney Branch | |
|---|---|
_(3).jpg) Construction photo of the 16th Street Bridge over Piney Branch | |
| Location | |
| Country | United States |
| Region | Washington, DC |
| Physical characteristics | |
| Mouth | |
• location | Rock Creek (Potomac River) |
| Length | 0.75 miles (1.21 km) |
| Basin size | 2,500 acres (10 km2) |
Piney Branch is a tributary of Rock Creek in Washington, D.C. It is the largest tributary located entirely within the Washington city limits. It is spanned by the 16th Street Bridge, the country's first parabolic arch bridge.