Structure 30 · District of Columbia County, DC
Carries Calvert Street over Rock Creek & Park DR, Over Rock Creek N.w..
Set by its lowest-rated component: Superstructure and Substructure at 6 of 9.
How ratings work751 ft end to end, longest span 180 ft: about 2.1 football fields. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a deck arch.
| State | District of Columbia |
| County | District of Columbia |
| Location | Over Rock Creek N.w. |
| Carries | Calvert Street |
| Crosses | Rock Creek & Park DR |
| Coordinates | 38.92327, -77.04756 |
| Material | Concrete Continuous |
| Design | Arch - Deck |
| Total Length | 750.7 ft (228.8 m) |
| Max Span | 180.1 ft (54.9 m) |
| Deck Width | 87.9 ft (26.8 m) |
| Deck Area | 6131.8 sq m |
| Main Spans | 3 |
| Year Built | 1933 (reconstructed 1992) |
| Avg Daily Traffic | 15,000 (2018) |
| Truck Traffic | 2% |
| Lanes On Bridge | 4 |
| Lanes Under Bridge | 6 |
| Last Inspection | December 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 0030 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.