Old Nj 27 over Millstone River
Mercer County, New Jersey · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Old Nj 27 over Millstone River in Mercer County, New Jersey, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1798, making it 227 years old at the 2025 inventory.
- It carries about 24 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 36 of the 413 inventoried bridges in Mercer County rated poor (8.7%); 36 (8.7%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated June 2023, on a 24-month routine inspection cycle.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (40.37374, -74.62045)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Superstructure | 3 | 3 | Serious condition |
| Substructure | 3 | 3 | Serious condition |
Bridge details
| Structure | Masonry deck arch |
| Length | about 109 ft |
| Location | 0.25 MI S of CR 614 |
| NBI structure number | 1105151 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | June 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the New Jersey department of transportation.
Busiest bridges in Mercer County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Route 29 Rampb over Assunpink Creek | 1969 | 163,000 | Fair |
| Nj Tpk(i-95) over Cedar Swamp Brook | 1950 | 128,068 | Fair |
| US 1 over Duck Pond Run | 1928 | 120,147 | Fair |
| I-295 Southbound over Franklin Corner Road | 1973 | 100,463 | Fair |
| Nj Tpk (I-95) over Nj 33 | 1950 | 99,482 | Fair |
| Nsi & Sni Roadways over Monmouth Street | 1950 | 99,482 | Fair |
All bridges nearby: Mercer County, NJ bridge conditions · every bridge in Mercer County · New Jersey bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.