399 AVE
Carrying 399 AVE over I090
2.0 E MT VERNON INTERCH, Davison, South Dakota
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
399 AVE in Davison, South Dakota sits above 48% of rated South Dakota bridges on inventory load rating (26 t), while its 1965 build year is earlier than 59% of Davison's recorded-year cohort (123 bridges).
399 AVE in Davison, South Dakota is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 1965, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 7. The lowest applicable rating sets the federal condition category, so this Good 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:000000018050105
INTERSTATE-ERA · PRESTRESS · LONG-SPAN-RUN · TIED-CTRL · LOCAL-ADT · STANDARD-LOAD · CAT-GOOD
- INTERSTATE-ERA 1950–1979
- PRESTRESS Prestressed concrete
- LONG-SPAN-RUN 4 spans
- TIED-CTRL Tied control
- LOCAL-ADT Local ADT
- STANDARD-LOAD Standard load
- CAT-GOOD Good
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: 399 AVE
The 399 AVE bridge in Davison, South Dakota carries 399 AVE over I090. It was built in 1965, making it 61 years old today. The structure is built primarily of prestressed concrete continuous and spans 4 sections, stretching 77.4 meters (254 feet) end to end. Daily traffic averages 85 vehicles, placing it in the lower-traffic tier of South Dakota bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 8/9, substructure at 7/9. The weakest component sits in good condition. All reported major components score above the Poor range.
How 399 AVE compares
Age against the county: built in 1965, earlier than 73 of Davison's 123 bridges with a recorded construction year (59%), against a county median build year of 1970. 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).
399 AVE vs every rated South Dakota bridge
Inventory load rating (metric tons), FHWA NBI, this state
26 Top 52% higher than 48% 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.
Davison inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 123 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
- 1965
- Material
- Prestressed Concrete Continuous
- Number of Spans
- 4
- Structure Length
- 77.4 m (254 ft)
- Deck Width
- 9.2 m (30 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 85 vehicles/day
- Structure Number
- 000000018050105
Condition Analysis
- • At 7/9, the deck (driving surface) is in good shape and shows no significant wear.
- • At 8/9, the superstructure (beams and supports above the deck) is in good shape and shows no significant wear.
- • The substructure (piers and abutments) rates good at 7/9, with no significant deterioration on file.
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 399 AVE 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 399 AVE against other structures in Davison 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 399 AVE?
399 AVE in Davison, South Dakota has a deck rating of 7/9, superstructure rating of 8/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is 399 AVE inspected?
399 AVE'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 85 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 399 AVE is currently shown as Good condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for 399 AVE?
399 AVE has an NBI inventory load rating of 26.2 metric tons.
Who is responsible for maintaining 399 AVE?
399 AVE is owned and maintained by State Highway Agency.
How old is 399 AVE and does age affect safety?
399 AVE was built in 1965, making it 61 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.