King Thorne Rd 355 over Wilson Run
Westmoreland County, Pennsylvania · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- King Thorne Rd 355 over Wilson Run in Westmoreland County, Pennsylvania, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1979, making it 46 years old at the 2025 inventory.
- It carries about 54 vehicles a day (traffic count year 2024).
- Its listed owner is a town or township highway agency.
- It is one of 97 of the 618 inventoried bridges in Westmoreland County rated poor (15.7%); 97 (15.7%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated March 2024, 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 → (40.21198, -79.5907)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Superstructure | 4 | 4 | Poor condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 42 ft |
| Location | 83 Ft So Int T355 & T479 |
| NBI structure number | 000000000036904 |
| Condition class | Poor |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 2024 |
| 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 Pennsylvania department of transportation.
Busiest bridges in Westmoreland County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SR 0030 over Mt Pleasant Rd (County) | 1959 | 51,342 | Fair |
| Pa Tpk (I-76) over Lyons Run | 1952 | 46,261 | Fair |
| Pa Tpk (I-76) over Lyons Run;wb-502 | 1952 | 46,261 | Fair |
| Pa Tpk (I-76) over Byers Run | 1952 | 46,261 | Fair |
| Pa Tpk (I-76) over SR 4017; Brush Hill Rd | 1952 | 46,261 | Fair |
| Pa Tpk (I-76) over T-755 Pennsylvania Ave. | 1952 | 46,261 | Fair |
All bridges nearby: Westmoreland County, PA bridge conditions · every bridge in Westmoreland County · Pennsylvania bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.