Rte 20 over Unadilla River
Herkimer County, New York · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Rte 20 over Unadilla River in Herkimer County, New York, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 2005, making it 20 years old at the 2025 inventory.
- It carries about 2,612 vehicles a day (traffic count year 2016).
- Its listed owner is the state highway agency.
- It is one of 119 of the 248 inventoried bridges in Herkimer County rated good (48.0%); 28 (11.3%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (42.88888, -75.15641)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 9 | Excellent condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Concrete multiple box beam |
| Length | about 66 ft |
| Location | 1 Mi W Jct US 20 & SH 51 |
| NBI structure number | 000000001015840 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the New York department of transportation.
Busiest bridges in Herkimer County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Rte I90 over NYS Route 28 RTE 28 | 1954 | 20,495 | Fair |
| Rte I90 over NY Route 5 RTE 5 West | 1994 | 20,495 | Good |
| Rte I90 over Bridenbaker Creek | 1954 | 20,495 | Fair |
| Rte I90 over Burch Creek | 1954 | 20,495 | Fair |
| Rte I90 over Knapp Creek | 1954 | 20,495 | Poor |
| Rte I90 over Woods Creek | 1954 | 20,495 | Fair |
All bridges nearby: Herkimer County, NY bridge conditions · every bridge in Herkimer County · New York bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.