Md 4 over ST Marys River
FairSt. Mary's County, Maryland · 1.1 Miles South of Md 235 · Structure no. 100000180035030
- Built
- 1974
- 51 years old
- Condition
- Fair
- inspected August 2024
- Type
- Culvert
- Steel
- Length
- 22 ft
- Daily traffic
- 18,051
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
Md 4 over ST Marys River is a steel culvert carrying Md 4 over ST Marys River in St. Mary's County, Maryland. It was built in 1974, so it is 51 years old, younger than the Maryland average of 52.6 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 18,051 vehicles a day, roughly 8% of them trucks, projected to reach 21,205 by 2026. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 1.2 mi (2 km).
Location
No coordinates are recorded for this structure.
Condition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Md 4 over ST Marys River built?
It was built in 1974, making it 51 years old in 2025.
What condition is Md 4 over ST Marys River in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2024.
How much traffic does Md 4 over ST Marys River carry?
About 18,051 vehicles per day (2009 count), of which roughly 8% are trucks.
How long is Md 4 over ST Marys River?
The structure is 22 ft (6.7 m) long with a longest span of 22 ft (6.7 m).
Who owns Md 4 over ST Marys River?
It is owned by the State Highway Agency.