T-306 Keystone Rd over Lehigh River
Lackawanna County, Pennsylvania · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- T-306 Keystone Rd over Lehigh River in Lackawanna County, Pennsylvania, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 1 (imminent failure condition) on the 0-9 scale.
- It was built in 1956, making it 69 years old at the 2025 inventory.
- It carries about 60 vehicles a day (traffic count year 2019).
- Its listed owner is the county highway agency.
- It is one of 54 of the 361 inventoried bridges in Lackawanna County rated poor (15.0%); 54 (15.0%) are rated poor.
- Its traffic status in the 2025 inventory is closed to all traffic (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated December 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 → (41.23647, -75.50252)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 1 | 1 | Imminent failure condition |
| Substructure | 4 | 4 | Poor condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 73 ft |
| Location | Clifton 0.2 Mi NW SR 435 |
| NBI structure number | 000000000020855 |
| Condition class | Poor |
| Traffic status (item 41) | Closed to all traffic |
| Last inspection (item 90) | December 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 4: foundations stable, field review says exposed foundations need protection |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Pennsylvania department of transportation.
Busiest bridges in Lackawanna County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SR 0081 I-81 over Boulevard Avenue | 1958 | 55,477 | Fair |
| SR 0081 I-81 over Lack Co RR & Lack River | 1958 | 55,477 | Good |
| SR 0081 I-81 NB over Olyphant Avenue | 1997 | 55,477 | Good |
| I-84 Tr6-84 Tg Rmp over Little Roaring Brook | 1961 | 54,729 | Fair |
| SR 0081 I-81 over North Main Ave | 1958 | 39,499 | Fair |
| SR 6006 over SR 0011 Tr 11 | 1963 | 37,769 | Fair |
All bridges nearby: Lackawanna County, PA bridge conditions · every bridge in Lackawanna County · Pennsylvania bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.