Plain Grove N Lib over Interstate 79
Lawrence County, Pennsylvania · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Plain Grove N Lib over Interstate 79 in Lawrence County, Pennsylvania, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1963 and reconstructed in 2008, making it 62 years old at the 2025 inventory.
- It carries about 319 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 110 of the 266 inventoried bridges in Lawrence County rated fair (41.4%); 30 (11.3%) 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 August 2024, on a 24-month routine inspection cycle.
- 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 → (41.07452, -80.1281)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 234 ft |
| Location | 2.7 Mi N of Pa-108 |
| NBI structure number | 000000000022387 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Pennsylvania department of transportation.
Busiest bridges in Lawrence County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Pa Tpk (I-76) over T-306 | 2006 | 21,767 | Good |
| Pa Turnpike (I-76) over Honey Creek;wb-101 | 2008 | 21,767 | Good |
| Pa Turnpike(i-76) over LR37056 SR 3002;wb-102 | 2008 | 21,767 | Good |
| Pa Turnpike (I-76) over Beaver Dam Run | 2008 | 21,767 | Good |
| Pa Turnpike (I-76) over N Fork Little Beaver Ck | 1952 | 21,767 | Fair |
| Pa Tpk (I-376) over Jenkins Run | 1992 | 19,742 | Fair |
All bridges nearby: Lawrence County, PA bridge conditions · every bridge in Lawrence County · Pennsylvania bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.