RTE 421 over Bog River
FairSt. Lawrence County, New York · 0.2 MI W JCT Rts 421 + 30 · Structure no. 000000001048280
- Built
- 1925
- 100 years old, rebuilt 1997
- Condition
- Fair
- inspected May 2023
- Type
- Arch - Deck
- Concrete
- Length
- 82 ft
- 1 main span
- Daily traffic
- 187
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
RTE 421 over Bog River is a concrete arch - deck carrying RTE 421 over Bog River in St. Lawrence County, New York. It was built in 1925 and reconstructed in 1997, so it is 100 years old, older than the New York average of 53 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 187 vehicles a day, roughly 11% of them trucks, projected to reach 262 by 2040. The structure is 82 ft (25 m) long and 25 ft wide. If it were closed, the detour would be 123.7 mi (199 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 |
|---|---|---|
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was RTE 421 over Bog River built?
It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1997.
What condition is RTE 421 over Bog 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 May 2023.
How much traffic does RTE 421 over Bog River carry?
About 187 vehicles per day (2020 count), of which roughly 11% are trucks.
How long is RTE 421 over Bog River?
The structure is 82 ft (25 m) long with a longest span of 78 ft (23.7 m) and a deck 25 ft wide.
Who owns RTE 421 over Bog River?
It is owned by the State Highway Agency.