4th Avenue SW
Carrying 4th Avenue SW over Big Sioux River
0.3E of 10th Street SW, Codington, South Dakota
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: 4th Avenue SW
The 4th Avenue SW bridge in Codington, South Dakota carries 4th Avenue SW over Big Sioux River. It was built in 1977, making it 49 years old today. The structure is built primarily of concrete continuous and spans 5 sections, stretching 43.9 meters (144 feet) end to end. Daily traffic averages 1,831 vehicles, placing it in the moderately-trafficked tier of South Dakota bridges. It is owned and maintained by City/Municipal Highway Agency.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 7/9, substructure at 7/9. The weakest component sits in fair condition. None of this bridge's reported major components fall into the Poor condition range. Its NBI inventory load rating is 24.9 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How 4th Avenue SW compares
Live comparison across South Dakota.
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 How the historical reference is calculated.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
- 1977
- Material
- Concrete Continuous
- Number of Spans
- 5
- Structure Length
- 43.9 m (144 ft)
- Deck Width
- 14.9 m (49 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 1,831 vehicles/day
- Structure Number
- 000000015181175
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 6/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • The superstructure (beams and supports above the deck) is in good condition (7/9), showing no significant deterioration.
- • The substructure (piers and abutments) rates good at 7/9, with no significant deterioration on file.
How to read this record
This page shows what the last federal inspection recorded, not whether 4th Avenue SW 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 4th Avenue SW against other structures in Codington and across South Dakota. South Dakota 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 4th Avenue SW?
4th Avenue SW in Codington, South Dakota has a deck rating of 6/9, superstructure rating of 7/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is 4th Avenue SW inspected?
4th Avenue SW'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 1,831 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 4th Avenue SW 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 4th Avenue SW?
4th Avenue SW has an NBI inventory load rating of 24.9 metric tons.
Who is responsible for maintaining 4th Avenue SW?
4th Avenue SW is owned and maintained by City/Municipal Highway Agency.
How old is 4th Avenue SW and does age affect safety?
4th Avenue SW was built in 1977, making it 49 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.