Md 550 over Monocacy River
FairFrederick County, Maryland · 2.68 Miles N of Md 194 · Structure no. 100000100093010
- Built
- 1967
- 58 years old
- Condition
- Fair
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 425 ft
- 6 main spans
- Daily traffic
- 3,691
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
Md 550 over Monocacy River is a steel continuous stringer/multi-beam or girder carrying Md 550 over Monocacy River in Frederick County, Maryland. It was built in 1967, so it is 58 years old, older 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 3,691 vehicles a day, roughly 8% of them trucks, projected to reach 5,537 by 2029. The structure is 425 ft (129.5 m) long and 38 ft wide. If it were closed, the detour would be 9.9 mi (16 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Md 550 over Monocacy River built?
It was built in 1967, making it 58 years old in 2025.
What condition is Md 550 over Monocacy 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 July 2024.
How much traffic does Md 550 over Monocacy River carry?
About 3,691 vehicles per day (2009 count), of which roughly 8% are trucks.
How long is Md 550 over Monocacy River?
The structure is 425 ft (129.5 m) long with a longest span of 75 ft (22.9 m) and a deck 38 ft wide.
Who owns Md 550 over Monocacy River?
It is owned by the State Highway Agency.