SR 4006 over Armstrong Creek
Dauphin County, Pennsylvania · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 4006 over Armstrong Creek in Dauphin 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 1920, making it 105 years old at the 2025 inventory.
- It carries about 312 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 41 of the 448 inventoried bridges in Dauphin County rated poor (9.2%); 41 (9.2%) are rated poor.
- Its traffic status in the 2025 inventory is closed to all traffic (NBI item 41).
- Its class is unchanged from 2024 (poor), but component ratings moved: superstructure 3 to 1.
- Status change: newly closed since 2024.
- Its most recent inspection on record is dated August 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 → (40.49708, -76.87312)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Superstructure | 3 | 1 | Imminent failure condition |
| Substructure | 4 | 4 | Poor condition |
Bridge details
| Structure | Concrete deck arch |
| Length | about 43 ft |
| Location | .5 Mi. S. Fisherville |
| NBI structure number | 000000000014585 |
| Condition class | Poor |
| Traffic status (item 41) | Closed to all traffic |
| Last inspection (item 90) | August 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 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.