STH 13
Carrying STH 13 over PORKY CREEK
1.9 MILES N. OF 29, Clark, Wisconsin
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
STH 13 in Clark, Wisconsin sits above 32% of rated Wisconsin bridges on inventory load rating (32 t), while its 1981 build year is earlier than 61% of Clark's recorded-year cohort (296 bridges).
STH 13 in Clark, Wisconsin is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1981, it carries 1 rated component 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 WI:B10024100000000
LATE-CENTURY · STEEL · MULTI-SPAN · CULVERT-LED · ARTERIAL-ADT · STANDARD-LOAD · CAT-FAIR
- LATE-CENTURY 1980–1999
- STEEL Steel
- MULTI-SPAN 3 spans
- CULVERT-LED Culvert-led
- ARTERIAL-ADT Arterial ADT
- STANDARD-LOAD Standard 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: STH 13
The STH 13 bridge in Clark, Wisconsin carries STH 13 over PORKY CREEK. It was built in 1981, making it 45 years old today. The structure is built primarily of steel and spans 3 sections, stretching 6.7 meters (22 feet) end to end. Daily traffic averages 6,800 vehicles, placing it in the moderately-trafficked tier of Wisconsin bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show culvert 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.
How STH 13 compares
Age against the county: built in 1981, earlier than 181 of Clark's 296 bridges with a recorded construction year (61%), against a county median build year of 1987. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Wisconsin bridges with a recorded inventory load rating (14,446 rated).
STH 13 vs every rated Wisconsin bridge
Inventory load rating (metric tons), FHWA NBI, this state
32 Top 68% higher than 32% of 14,446 bridges
rated Wisconsin 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.
Clark inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 296 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
- 1981
- Material
- Steel
- Number of Spans
- 3
- Structure Length
- 6.7 m (22 ft) 0
- Owner
- State Highway Agency
- Avg Daily Traffic
- 6,800 vehicles/day
- Structure Number
- B10024100000000
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 STH 13 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 13 against other structures in Clark 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 13?
STH 13 in Clark, Wisconsin on the FHWA's 0–9 scale.
How often is STH 13 inspected?
STH 13'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 6,800 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. STH 13 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 13?
STH 13 has an NBI inventory load rating of 32.4 metric tons.
Who is responsible for maintaining STH 13?
STH 13 is owned and maintained by State Highway Agency.
How old is STH 13 and does age affect safety?
STH 13 was built in 1981, making it 45 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.
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.