40430 301st Street
Carrying 40430 301st Street over Dry Choteau Creek
0.8S & 4.3E of Dante, Charles Mix, South Dakota
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
40430 301st Street in Charles Mix, South Dakota sits above 57% of rated South Dakota bridges on inventory load rating (31 t), while its 2021 build year is earlier than 1% of Charles Mix's recorded-year cohort (103 bridges).
40430 301st Street in Charles Mix, South Dakota is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 2021, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 8. 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:000000012603328
POST-2000 · STEEL · SINGLE-SPAN · TIED-CTRL · TRACE-ADT · STANDARD-LOAD · CAT-GOOD
- POST-2000 2000+
- STEEL Steel
- SINGLE-SPAN Single span
- TIED-CTRL Tied control
- TRACE-ADT Trace 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: 40430 301st Street
The 40430 301st Street bridge in Charles Mix, South Dakota carries 40430 301st Street over Dry Choteau Creek. It was built in 2021, making it 5 years old today. The structure is built primarily of steel and spans 1 section, stretching 10.8 meters (35 feet) end to end. Daily traffic averages 48 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 8/9, superstructure at 8/9, substructure at 8/9. The weakest component sits in good condition. All reported major components score above the Poor range.
How 40430 301st Street compares
Age against the county: built in 2021, earlier than 1 of Charles Mix's 103 bridges with a recorded construction year (1%), against a county median build year of 1970. This is one of the newer structures in its county.
Live comparison across South Dakota bridges with a recorded inventory load rating (5,886 of 5,887 rated).
40430 301st Street vs every rated South Dakota bridge
Inventory load rating (metric tons), FHWA NBI, this state
31 Top 43% higher than 57% 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.
Charles Mix inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 103 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
- 2021
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 10.8 m (35 ft)
- Deck Width
- 7.5 m (25 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 48 vehicles/day
- Structure Number
- 000000012603328
Condition Analysis
- • The deck (driving surface) rates good at 8/9, with no significant deterioration on file.
- • The superstructure (beams and supports above the deck) is in good condition (8/9), showing no significant deterioration.
- • At 8/9, 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 40430 301st Street 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 40430 301st Street against other structures in Charles Mix 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 40430 301st Street?
40430 301st Street in Charles Mix, South Dakota has a deck rating of 8/9, superstructure rating of 8/9, and substructure rating of 8/9 on the FHWA's 0–9 scale.
How often is 40430 301st Street inspected?
40430 301st Street'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 48 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. 40430 301st Street 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 40430 301st Street?
40430 301st Street has an NBI inventory load rating of 31.0 metric tons.
Who is responsible for maintaining 40430 301st Street?
40430 301st Street is owned and maintained by County Highway Agency.
How old is 40430 301st Street and does age affect safety?
40430 301st Street was built in 2021, making it 5 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.