CASTLE SHANNON BLV
Carrying CASTLE SHANNON BLV over SAW MILL RUN
300' NW OF SR 88, Allegheny, Pennsylvania
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: CASTLE SHANNON BLV
The CASTLE SHANNON BLV bridge in Allegheny, Pennsylvania carries CASTLE SHANNON BLV over SAW MILL RUN. It was built in 1900, making it 126 years old today. It was last reconstructed in 1920, extending its service life. The structure is built primarily of masonry and spans 1 section, stretching 7.0 meters (23 feet) end to end. Daily traffic averages 12,901 vehicles, placing it in the heavily-trafficked tier of Pennsylvania bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show superstructure at 5/9, substructure at 5/9. The weakest component sits in fair condition. No reported major component scores in the Poor range under the current federal condition thresholds. Its NBI inventory load rating is 43.5 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How CASTLE SHANNON BLV compares
Live comparison across Pennsylvania.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 1900
- Last Reconstructed
- 1920
- Material
- Masonry
- Number of Spans
- 1
- Structure Length
- 7.0 m (23 ft)
- Deck Width
- 13.7 m (45 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 12,901 vehicles/day
- Structure Number
- 000000000001762
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The superstructure (beams and supports above the deck) rates fair at 5/9, minor deterioration that routine maintenance should address.
- • The substructure (piers and abutments) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
How to read this record
This page shows what the last federal inspection recorded, not whether CASTLE SHANNON BLV is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare CASTLE SHANNON BLV against other structures in Allegheny and across Pennsylvania. Pennsylvania bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for CASTLE SHANNON BLV?
CASTLE SHANNON BLV in Allegheny, Pennsylvania, superstructure rating of 5/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is CASTLE SHANNON BLV inspected?
CASTLE SHANNON BLV's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 12,901 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. CASTLE SHANNON BLV is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for CASTLE SHANNON BLV?
CASTLE SHANNON BLV has an NBI inventory load rating of 43.5 metric tons.
Who is responsible for maintaining CASTLE SHANNON BLV?
CASTLE SHANNON BLV is owned and maintained by State Highway Agency.
How old is CASTLE SHANNON BLV and does age affect safety?
CASTLE SHANNON BLV was built in 1900, making it 126 years old and last reconstructed in 1920.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.