T-546 over over Four Mile Run
Warren County, Pennsylvania · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- T-546 over over Four Mile Run in Warren County, Pennsylvania, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 2 (critical condition) on the 0-9 scale.
- It was built in 1970 and reconstructed in 2008, making it 55 years old at the 2025 inventory.
- It carries about 50 vehicles a day (traffic count year 2006).
- Its listed owner is a town or township highway agency.
- It is one of 38 of the 218 inventoried bridges in Warren County rated poor (17.4%); 38 (17.4%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its class is unchanged from 2024 (poor), but component ratings moved: substructure 3 to 2, deck 4 to 5.
- Its most recent inspection on record is dated May 2024, on a 12-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 2): scour critical: extensive scour observed, foundations unstable.
- 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 → (41.72504, -79.05487)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 4 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 3 | 2 | Critical condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 50 ft |
| Location | Sheffield Township |
| NBI structure number | 000000000034273 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | May 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | 2: scour critical: extensive scour observed, foundations unstable |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Pennsylvania department of transportation.
Busiest bridges in Warren County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SR 62 Market St. over over Jackson Run | 1973 | 14,835 | Fair |
| SR 6006 Penn Ave.e over over Conewango Creek | 1987 | 10,659 | Good |
| SR 62 over over Valentine Creek | 1941 | 9,699 | Fair |
| SR 6 Grand Army Hy over over Morse Run | 1950 | 8,651 | Fair |
| SR 6 Grand Army Hy over Allegheny & Eastern RR | 1976 | 8,651 | Fair |
| SR 6 Warren Bypass over over SR62 Ludow St E/w | 1976 | 8,651 | Fair |
All bridges nearby: Warren County, PA bridge conditions · every bridge in Warren County · Pennsylvania bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.