RTE 51 over Unadilla River
PoorHerkimer County, New York · 01MI S JCT Rts 51+20 · Structure no. 000000001026470
- Built
- 1937
- 88 years old
- Condition
- Poor
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 52 ft
- 1 main span
- Daily traffic
- 1,531
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
RTE 51 over Unadilla River is a steel stringer/multi-beam or girder carrying RTE 51 over Unadilla River in Herkimer County, New York. It was built in 1937, so it is 88 years old, older than the New York average of 53 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 1,531 vehicles a day, roughly 6% of them trucks, projected to reach 1,597 by 2041. The structure is 52 ft (15.8 m) long and 42 ft wide. If it were closed, the detour would be 16.8 mi (27 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was RTE 51 over Unadilla River built?
It was built in 1937, making it 88 years old in 2025.
What condition is RTE 51 over Unadilla River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.
How much traffic does RTE 51 over Unadilla River carry?
About 1,531 vehicles per day (2020 count), of which roughly 6% are trucks.
How long is RTE 51 over Unadilla River?
The structure is 52 ft (15.8 m) long with a longest span of 45 ft (13.7 m) and a deck 42 ft wide.
Who owns RTE 51 over Unadilla River?
It is owned by the State Highway Agency.