Md 117 over Little Seneca Creek
Montgomery County, Maryland · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Md 117 over Little Seneca Creek in Montgomery County, Maryland, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1953 and reconstructed in 1972, making it 72 years old at the 2025 inventory.
- It carries about 7,457 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 292 of the 522 inventoried bridges in Montgomery County rated fair (55.9%); 25 (4.8%) 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 2024, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (39.17507, -77.30002)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel culvert |
| Length | about 57 ft |
| Location | 1.03 Miles East of Md 121 |
| NBI structure number | 100000150095030 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Maryland department of transportation.
Busiest bridges in Montgomery County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Is 270 over Old Farm Creek | 1958 | 265,320 | Fair |
| Is 270 over Tuckerman Lane | 1958 | 265,320 | Fair |
| Is 495 over Stoney Brook Dr Rock CR | 1964 | 242,821 | Fair |
| Is 495 over Md 650 | 1963 | 242,500 | Fair |
| Is 270 & Cd Rds over Watts Branch | 1955 | 239,460 | Fair |
| Is 495 over Md 185 | 1964 | 239,310 | Fair |
All bridges nearby: Montgomery County, MD bridge conditions · every bridge in Montgomery County · Maryland bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.