Marriottsville Rd over South Br Patapsco River
Carroll County, Maryland · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Marriottsville Rd over South Br Patapsco River in Carroll County, Maryland, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1986, making it 39 years old at the 2025 inventory.
- It carries about 12,255 vehicles a day (traffic count year 2021).
- Its listed owner is the county highway agency.
- It is one of 57 of the 205 inventoried bridges in Carroll County rated good (27.8%); 10 (4.9%) 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 August 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 → (39.35167, -76.89814)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 139 ft |
| Location | on Howard County Line |
| NBI structure number | 200000CL0332010 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Maryland department of transportation.
Busiest bridges in Carroll County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Is 70 EB over Md 27 | 1974 | 65,550 | Fair |
| Is 70 WB over Md 27 | 1974 | 65,550 | Fair |
| Md 140 WB & Ramp B over Md 97 | 2006 | 47,060 | Good |
| Md 140 EB over Md 97 | 2006 | 47,060 | Good |
| Md 140 over Md Mid RR MD27 West Br | 2006 | 45,521 | Good |
| Md 32 over Piney Run | 1957 | 26,590 | Fair |
All bridges nearby: Carroll County, MD bridge conditions · every bridge in Carroll County · Maryland bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.