Structure 200000BC3203010 · Baltimore County, MD
Carries Perring PKWY Ramp over Herring Run, On Ramp WB Northern PKWY.
203 ft end to end, longest span 66 ft: about 3 semi-trucks nose to tail. 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 multi-beam bridge.
| State | Maryland |
| County | Baltimore |
| Location | On Ramp WB Northern PKWY |
| Carries | Perring PKWY Ramp |
| Crosses | Herring Run |
| Coordinates | 39.36944, -76.57300 |
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 203.1 ft (61.9 m) |
| Max Span | 65.9 ft (20.1 m) |
| Deck Width | 28.5 ft (8.7 m) |
| Deck Area | 538.5 sq m |
| Main Spans | 3 |
| Year Built | 1965 |
| Avg Daily Traffic | 75,220 (2024) |
| That is about 75,220 vehicles per lane per day — beyond what any U.S. road carries (the busiest freeways run about 25,000–30,000). It is almost certainly a data-entry error in the National Bridge Inventory, so we leave this bridge out of traffic rankings. | |
| Truck Traffic | 5% |
| Lanes On Bridge | 1 |
| Last Inspection | December 2024 |
| Inspection Frequency | Every 12 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 200000BC3203010 |
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.