STH 100 NB-MAYFAIR
Carrying STH 100 NB-MAYFAIR over MENOMONEE RIVER
3.4M N JCT USH 18 (F), Milwaukee, Wisconsin
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: STH 100 NB-MAYFAIR
The STH 100 NB-MAYFAIR bridge in Milwaukee, Wisconsin carries STH 100 NB-MAYFAIR over MENOMONEE RIVER. It was built in 1968, making it 58 years old today. The structure is built primarily of concrete continuous and spans 5 sections, stretching 64.4 meters (211 feet) end to end. Daily traffic averages 11,300 vehicles, placing it in the heavily-trafficked tier of Wisconsin bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 5/9, superstructure at 5/9, substructure at 5/9. The weakest component sits in fair condition. All reported major components score above the Poor range. Its NBI inventory load rating is 29.2 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How STH 100 NB-MAYFAIR 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 How the historical reference is calculated.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
- 1968
- Material
- Concrete Continuous
- Number of Spans
- 5
- Structure Length
- 64.4 m (211 ft)
- Deck Width
- 13.9 m (46 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 11,300 vehicles/day
- Structure Number
- B40033900000000
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 5/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • The superstructure (beams and supports above the deck) rates fair at 5/9, minor deterioration that routine maintenance should address.
- • At 5/9, 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 STH 100 NB-MAYFAIR 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 STH 100 NB-MAYFAIR against other structures in Milwaukee 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 STH 100 NB-MAYFAIR?
STH 100 NB-MAYFAIR in Milwaukee, Wisconsin has a deck rating of 5/9, superstructure rating of 5/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is STH 100 NB-MAYFAIR inspected?
STH 100 NB-MAYFAIR'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 11,300 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. STH 100 NB-MAYFAIR 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 STH 100 NB-MAYFAIR?
STH 100 NB-MAYFAIR has an NBI inventory load rating of 29.2 metric tons.
Who is responsible for maintaining STH 100 NB-MAYFAIR?
STH 100 NB-MAYFAIR is owned and maintained by State Highway Agency.
How old is STH 100 NB-MAYFAIR and does age affect safety?
STH 100 NB-MAYFAIR was built in 1968, making it 58 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.