309TH AVENUE
Carrying 309TH AVENUE over CK
0.2 W 0.4 S BLUNT, Hughes, South Dakota
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
309TH AVENUE in Hughes, South Dakota sits above 13% of rated South Dakota bridges on inventory load rating (18 t), while its 1962 build year is earlier than 70% of Hughes's recorded-year cohort (40 bridges).
309TH AVENUE in Hughes, South Dakota is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1962, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 6. 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 SD:000000033288023
INTERSTATE-ERA · CONCRETE · LONG-SPAN-RUN · SUPER-LED · LOCAL-ADT · LIGHT-LOAD · CAT-FAIR
- INTERSTATE-ERA 1950–1979
- CONCRETE Concrete
- LONG-SPAN-RUN 5 spans
- SUPER-LED Superstructure-led
- LOCAL-ADT Local ADT
- LIGHT-LOAD Light 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: 309TH AVENUE
The 309TH AVENUE bridge in Hughes, South Dakota carries 309TH AVENUE over CK. It was built in 1962, making it 64 years old today. The structure is built primarily of concrete continuous and spans 5 sections, stretching 32.2 meters (106 feet) end to end. Daily traffic averages 152 vehicles, placing it in the lower-traffic tier of South Dakota bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 6/9, substructure at 7/9. The weakest component sits in fair condition. No reported major component scores in the Poor range under the current federal condition thresholds.
How 309TH AVENUE compares
Age against the county: built in 1962, earlier than 28 of Hughes's 40 bridges with a recorded construction year (70%), against a county median build year of 1967. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across South Dakota bridges with a recorded inventory load rating (5,886 of 5,887 rated).
309TH AVENUE vs every rated South Dakota bridge
Inventory load rating (metric tons), FHWA NBI, this state
18 Top 87% higher than 13% of 5,886 bridges
rated South Dakota 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.
Hughes inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 40 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
- 1962
- Material
- Concrete Continuous
- Number of Spans
- 5
- Structure Length
- 32.2 m (106 ft)
- Deck Width
- 8.6 m (28 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 152 vehicles/day
- Structure Number
- 000000033288023
Condition Analysis
- • At 7/9, the deck (driving surface) is in good shape and shows no significant wear.
- • The superstructure (beams and supports above the deck) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • At 7/9, the substructure (piers and abutments) is in good shape and shows no significant wear.
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 309TH AVENUE 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 309TH AVENUE against other structures in Hughes 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 309TH AVENUE?
309TH AVENUE in Hughes, South Dakota has a deck rating of 7/9, superstructure rating of 6/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is 309TH AVENUE inspected?
309TH AVENUE'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 152 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 309TH AVENUE 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 309TH AVENUE?
309TH AVENUE has an NBI inventory load rating of 17.6 metric tons.
Who is responsible for maintaining 309TH AVENUE?
309TH AVENUE is owned and maintained by County Highway Agency.
How old is 309TH AVENUE and does age affect safety?
309TH AVENUE was built in 1962, making it 64 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.