Cooley Mill Road over Rock Run
Harford County, Maryland · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Cooley Mill Road over Rock Run in Harford County, Maryland, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
- It was built in 1997, making it 28 years old at the 2025 inventory.
- It carries about 200 vehicles a day (traffic count year 2019).
- Its listed owner is the county highway agency.
- It is one of 107 of the 276 inventoried bridges in Harford County rated good (38.8%); 12 (4.3%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated July 2023, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (39.59072, -76.15801)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 25 ft |
| Location | 0.7 Mi SE of Rock Run Rd |
| NBI structure number | 200000H-0020010 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 7: scour countermeasures installed |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Maryland department of transportation.
Busiest bridges in Harford County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-95 over Winters Run Rd Winters R | 1963 | 161,591 | Fair |
| I-95 over James Run | 1963 | 130,492 | Fair |
| I-95 over Grays Run | 1963 | 116,162 | Good |
| I-95 over Carsins Run | 1963 | 100,386 | Good |
| I-95 over Swan Creek | 1963 | 100,386 | Fair |
| I-95 over Md 462 | 1963 | 95,675 | Fair |
All bridges nearby: Harford County, MD bridge conditions · every bridge in Harford County · Maryland bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.