T-418 BEAVER DAM
Carrying T-418 BEAVER DAM over MUDDY CREEK
0.5 miles NW of S.R. 4002, Butler, Pennsylvania
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
T-418 BEAVER DAM in Butler, Pennsylvania is rated Fair in the FHWA's 2024 National Bridge Inventory.
Built in 1940, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 5. The lowest applicable rating sets the federal condition category, so this Fair result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure PA:000000000008184
PRE-1950 · STEEL · SINGLE-SPAN · SUB-LED · LOCAL-ADT · HEAVY-LOAD · CAT-FAIR
- PRE-1950 Pre-1950
- STEEL Steel
- SINGLE-SPAN Single span
- SUB-LED Substructure-led
- LOCAL-ADT Local ADT
- HEAVY-LOAD Heavy load
- CAT-FAIR Fair
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Bridge Snapshot: T-418 BEAVER DAM
The T-418 BEAVER DAM bridge in Butler, Pennsylvania carries T-418 BEAVER DAM over MUDDY CREEK. It was built in 1940, making it 86 years old today. It was last reconstructed in 2008, extending its service life. The structure is built primarily of steel and spans 1 section, stretching 9.8 meters (32 feet) end to end. Daily traffic averages 100 vehicles, placing it in the lower-traffic tier of Pennsylvania bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 8/9, substructure at 5/9. The weakest component sits in fair condition. All reported major components score above the Poor range.
How T-418 BEAVER DAM compares
Age against the county: built in 1940, earlier than 301 of Butler's 378 bridges with a recorded construction year (80%), against a county median build year of 1974. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Pennsylvania bridges with a recorded inventory load rating (23,297 of 23,299 rated).
T-418 BEAVER DAM vs every rated Pennsylvania bridge
Inventory load rating (metric tons), FHWA NBI, this state
45 Top 25% higher than 75% of 23,297 bridges
rated Pennsylvania bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
Butler inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 378 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 1940
- Last Reconstructed
- 2008
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 9.8 m (32 ft)
- Deck Width
- 5.8 m (19 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 100 vehicles/day
- Structure Number
- 000000000008184
Condition Analysis
- • The deck (driving surface) rates good at 7/9, with no significant deterioration on file.
- • The superstructure (beams and supports above the deck) is in good condition (8/9), showing no significant deterioration.
- • The substructure (piers and abutments) rates fair at 5/9, minor deterioration that routine maintenance should address.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
This page shows what the last federal inspection recorded, not whether T-418 BEAVER DAM 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 T-418 BEAVER DAM against other structures in Butler 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 T-418 BEAVER DAM?
T-418 BEAVER DAM in Butler, Pennsylvania has a deck rating of 7/9, superstructure rating of 8/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is T-418 BEAVER DAM inspected?
T-418 BEAVER DAM'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 100 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. T-418 BEAVER DAM 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 T-418 BEAVER DAM?
T-418 BEAVER DAM has an NBI inventory load rating of 45.4 metric tons.
Who is responsible for maintaining T-418 BEAVER DAM?
T-418 BEAVER DAM is owned and maintained by County Highway Agency.
How old is T-418 BEAVER DAM and does age affect safety?
T-418 BEAVER DAM was built in 1940, making it 86 years old and last reconstructed in 2008.
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.
Share this inspection record
Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.