T-390- Union St. over Pa 283; SR 0300
Dauphin County, Pennsylvania · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- T-390- Union St. over Pa 283; SR 0300 in Dauphin County, Pennsylvania, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1971 and reconstructed in 2016, making it 54 years old at the 2025 inventory.
- It carries about 8,385 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 311 of the 448 inventoried bridges in Dauphin County rated fair (69.4%); 41 (9.2%) are rated poor.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (40.22704, -76.73752)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 7 | Good condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 171 ft |
| Location | 2 Mi.n. Middletown |
| NBI structure number | 000000000014350 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Pennsylvania department of transportation.
Busiest bridges in Dauphin County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-83; SR 0083 over Twp Rd 369 & Sprng Crk.r | 1953 | 91,219 | Fair |
| I-83; SR 0083 over Twp Rd 392 Peiffer Lane | 1994 | 91,219 | Fair |
| SR 0083; I-83 over Susq.river;r.r.lowther S | 1960 | 89,499 | Poor |
| I-83; SR 0083 over Pa 230;NS;RP B C;front | 1960 | 89,209 | Fair |
| I-83; SR 0083 over T-411; Londonderry Rd | 2021 | 84,491 | Good |
| I-83; SR 0083 over T-586; Megoulas Blvd. | 2021 | 84,491 | Good |
All bridges nearby: Dauphin County, PA bridge conditions · every bridge in Dauphin County · Pennsylvania bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.