USH STH 52-USH B51
Carrying USH STH 52-USH B51 over WISCONSIN RIVER 32
0.7M N JCT STH 52 TO E, Marathon, Wisconsin
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: USH STH 52-USH B51
The USH STH 52-USH B51 bridge in Marathon, Wisconsin carries USH STH 52-USH B51 over WISCONSIN RIVER 32. It was built in 1997, making it 29 years old today. The structure is built primarily of prestressed concrete continuous and spans 3 sections, stretching 86.4 meters (283 feet) end to end. Daily traffic averages 27,244 vehicles, placing it in the heavily-trafficked tier of Wisconsin bridges. It is owned and maintained by City/Municipal Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 7/9, substructure at 6/9. 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 35.6 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How USH STH 52-USH B51 compares
Live comparison across Wisconsin.
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 How the historical reference is calculated.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
- 1997
- Material
- Prestressed Concrete Continuous
- Number of Spans
- 3
- Structure Length
- 86.4 m (283 ft)
- Deck Width
- 15.5 m (51 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 27,244 vehicles/day
- Structure Number
- B37026600000000
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗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 (7/9), showing no significant deterioration.
- • At 6/9, the substructure (piers and abutments) shows fair condition, with minor wear flagged for upkeep.
How to read this record
This page shows what the last federal inspection recorded, not whether USH STH 52-USH B51 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 USH STH 52-USH B51 against other structures in Marathon and across Wisconsin. Wisconsin 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 USH STH 52-USH B51?
USH STH 52-USH B51 in Marathon, Wisconsin has a deck rating of 7/9, superstructure rating of 7/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is USH STH 52-USH B51 inspected?
USH STH 52-USH B51'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 27,244 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. USH STH 52-USH B51 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 USH STH 52-USH B51?
USH STH 52-USH B51 has an NBI inventory load rating of 35.6 metric tons.
Who is responsible for maintaining USH STH 52-USH B51?
USH STH 52-USH B51 is owned and maintained by City/Municipal Highway Agency.
How old is USH STH 52-USH B51 and does age affect safety?
USH STH 52-USH B51 was built in 1997, making it 29 years old.
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.